Jobs Java

About Our Client:

Our client is a leading enterprise data platform company building an open, high-performance data lakehouse for AI and analytical workloads. The platform combines an intelligent SQL query engine, an AI-ready semantic layer, and an open catalog built on Apache Iceberg — enabling Fortune 500 companies across finance, energy, manufacturing, and logistics to unify, query, and govern data at massive scale across cloud and on-premise sources.

About the Role:

We are looking for a Senior Software Engineer for the connectivity stack of a large-scale data platform. The work spans three areas:

• Client connectivity — drivers and client libraries used by applications and BI tools
• Source connectivity — connectors to databases and data systems, including authentication, metadata discovery, and query/data pushdown, with certification and upgrade support
• Agent & service connectivity — tool interfaces and integrations for AI-agent access to the platform

Deep expertise in one of these areas is enough — you'll grow into the adjacent ones over time. This is a role for an engineer who cares about API and protocol stability, backward compatibility, and interoperability with the tools enterprises actually use. You will lead the design and delivery of substantial components, working within an established architecture alongside US-based engineering reviewers.

This is a systems-level, backend engineering role focused on drivers, protocols, and distributed services — not application development or CRUD services.

Responsibilities:

• Lead the design and delivery of connectivity components — client drivers, source connectors, and service integrations — turning ambiguous initiatives into well-scoped, reviewable milestones
• Produce technical designs, explain architectural trade-offs, and surface compatibility, security, and delivery risks early
• Maintain backward compatibility and API/protocol stability; build compatibility, interoperability, and performance test suites
• Develop and maintain connectors for major BI tools, collaborating with the technology partners behind them
• Diagnose complex client/server, protocol, and distributed-system failures; drive root-cause analysis of customer-reported and escaped defects
• Improve diagnostics, logging, observability, and supportability of the connectivity stack
• Contribute upstream to open-source projects (e.g., Apache Arrow) where agreed
• Mentor engineers, participate in code and design reviews, and communicate progress and risks clearly across a distributed team.

Required Qualifications:

• B.S. or M.S. in Computer Science, Computer Engineering, or a related field — or equivalent practical experience
• 8+ years of production software engineering experience
• Deep proficiency in Java or C++, and the ability to work effectively in another systems/services language
• Experience designing and debugging APIs, protocols, client libraries, or distributed services
• Strong fundamentals: data structures, concurrency, asynchronous programming, networking, and failure handling
• A track record of comprehensive testing — unit, integration, compatibility, and performance
• Experience with production CI/CD, release processes, and engineering quality controls
• Working knowledge of SQL
• Comfortable with AI-assisted development workflows — using modern AI tools productively while critically validating their output
• Clear written and verbal communication in a distributed engineering environment; English Upper-Intermediate or higher (B2+)
• Availability to work EU business hours shifted 2–3 hours later for daily overlap with US West Coast mornings.

Desired Skills:

• JDBC, ODBC, ADBC, or database-driver development experience
• Apache Arrow (including Arrow Flight)
• SQL engines, databases, or data platforms
• Source-connector development for databases, warehouses, or SaaS systems
• MCP or agent-tool integrations
• OAuth, OIDC, TLS, and enterprise authentication flows
• Cross-platform native build, packaging, and release experience
• BI-tool interoperability (Power BI, Tableau) and partner collaboration
• Observability and production diagnostics
• Open-source contribution experience.

Details:

• Engagement: Long-term contract
• Location: Europe (EU / EEA / UK), remote
• Working hours: EU business hours, shifted 2–3 hours later for daily overlap with the US West Coast team

About Our Client:

Our client is a leading enterprise data platform company building an open, high-performance data lakehouse for AI and analytical workloads. The platform combines an intelligent SQL query engine, an AI-ready semantic layer, and an open catalog built on Apache Iceberg — enabling Fortune 500 companies across finance, energy, manufacturing, and logistics to unify, query, and govern data at massive scale across cloud and on-premise sources.

About the Role:

We are looking for a Senior Software Engineer for the data catalog and enterprise data management layer of a large-scale lakehouse platform — the services that automate data ingestion and autonomously optimize Apache Iceberg tables. You will own features through the full development cycle, from design through deployment, in a multithreaded, distributed environment where scalability, performance, and always-on availability are the baseline expectations.

This is a systems-level, backend engineering role focused on data infrastructure internals — not application development or CRUD services.

Responsibilities:

• Own the full software development cycle — inception, design, development, testing, deployment — for catalog and data-management services
• Build and operate services for automated ingestion and autonomous optimization of Apache Iceberg tables
• Reason about concurrency and parallelization to deliver scalability and performance in multithreaded, distributed systems
• Drive performance tuning and system-efficiency improvements
• Work with Apache Foundation open-source projects, contributing upstream where agreed
• Participate in code and design reviews, upholding a high engineering bar
• Collaborate with product managers, support teams, and solution architects on feature requests and design updates
• Partner with US-based engineering leads on technical decisions.

Required Qualifications:

• B.S., M.S., or PhD in Computer Science or a related field
• 5+ years of software engineering experience, preferably focused on database systems or related fields
• Strong object-oriented programming skills in Java or C++
• Solid grounding in data structures and algorithms
• Hands-on experience with multithreaded and asynchronous programming patterns for scalable, performant systems
• A passion for engineering quality — zero-downtime upgrades, availability, resiliency, and uptime as first-class concerns
• Comfort with a fast-moving environment; strong ownership; the confidence to defend a technical position and the openness to be mentored
• Comfortable with AI-assisted development workflows — using modern AI tools productively while critically validating their output
• English Upper-Intermediate or higher (B2+) — daily written and verbal communication with a US-based engineering team
• Availability to work EU business hours shifted 2–3 hours later for daily overlap with US West Coast mornings.

Desired Skills:

• Database internals and query planning
• Distributed systems: concurrency control, data replication, storage systems
• Apache Iceberg or other open table formats (Delta Lake, Hudi)
• Messaging systems: Kafka, NATS, or cloud pub/sub services
• Contributions to open-source data infrastructure (Apache projects especially valued).

Details:

• Engagement: Long-term contract
• Location: Europe (EU / EEA / UK), remote
• Working hours: EU business hours, shifted 2–3 hours later for daily overlap with the US West Coast team

About Our Client:

Our client is a leading enterprise data platform company building an open, high-performance data lakehouse for AI and analytical workloads. The platform combines an intelligent SQL query engine, an AI-ready semantic layer, and an open catalog built on Apache Iceberg — enabling Fortune 500 companies across finance, energy, manufacturing, and logistics to unify, query, and govern data at massive scale across cloud and on-premise sources.

About the Role:

We are looking for a Senior Software Engineer to build and operate production AI agent and search services on top of a large-scale data platform. This is hands-on work at the intersection of distributed backend engineering and applied AI: multi-agent workflows, tool-execution infrastructure, retrieval and relevance, and integrations with multiple LLM providers — all running as real, customer-facing production services with the reliability expectations that implies.

Responsibilities:

• Design and implement scalable multi-agent workflows (including conversation state), tool-execution infrastructure, and data-aware tools working with catalogs, schemas, lineage, SQL, jobs, semantic metadata, data preparation, and visualizations
• Build search and retrieval capabilities with OpenSearch or equivalent — indexing, relevance tuning, hybrid keyword + vector search
• Integrate multiple LLM/model providers with secure configuration and graceful degradation
• Develop APIs and event contracts across REST, streaming/SSE, gRPC, protobuf, and SDKs, including UI integrations
• Operate, monitor, and improve production services — service health, logs, metrics, traces, search-cluster health, latency, and error rates; participate in the team's production-support model
• Investigate incidents, drive root-cause analysis, and ship durable fixes
• Design for permissions, tool approvals, multi-tenancy, and customer-data governance
• Maintain dependencies, apply security fixes, and reduce tech debt; produce designs, tests, runbooks, and documentation; lead technical discussions and review code.

Required Qualifications:

• B.S. or M.S. in Computer Science, Computer Engineering, or a related field — or equivalent practical experience
• 7+ years of relevant experience, or equivalent demonstrated senior-level impact
• Strong Java software engineering skills
• Strong grasp of concurrency, data structures, API design, testing, maintainability, and backward compatibility
• Solid background in distributed systems, microservices, cloud services, or data-intensive backends
• Hands-on experience with search technologies — OpenSearch, Elasticsearch, or Lucene — including vector search, embeddings, or relevance systems
• Experience building LLM applications, agent/tool workflows, RAG systems, or model-provider integrations
• Strong production instincts: diagnosing failures via logs, metrics, and traces; designing for fault tolerance, retries, cancellation, and recovery
• SQL and familiarity with data platform concepts: catalogs, metadata, schemas, governance, lineage
• Comfort leading ambiguous, cross-service work with clear stakeholder communication and strong written documentation
• Comfortable with AI-assisted development workflows — using modern AI tools productively while critically validating their output
• English Upper-Intermediate or higher (B2+) — daily written and verbal communication with a US-based engineering team
• Availability to work EU business hours shifted 2–3 hours later for daily overlap with US West Coast mornings.

Desired Skills:

• LangChain4j or similar agent frameworks
• Python for AI services, evaluation harnesses, or sandboxed execution
• React and TypeScript
• gRPC, protobuf, Quarkus, Kubernetes, MongoDB, KV stores, event-driven architectures
• Apache Arrow, Apache Iceberg, OpenLineage, semantic layers, or data-governance systems
• AI quality evaluation: LLM-as-judge, model benchmarking, production AI metrics
• OpenSearch operations: index lifecycle management, relevance tuning, incident response
• Open-source contributions.

Details:

• Engagement: Long-term contract
• Location: Europe (EU / EEA / UK), remote
• Working hours: EU business hours, shifted 2–3 hours later for daily overlap with the US West Coast team

Project Description:

Luxoft is seeking motivated Appian developers to join our expanding Appian Digital Automation Practice in India. You will have the opportunity to work with our global clients on digital transformation initiatives and contribute to the Appian Center of Excellence for our customers.

You will collaborate with high-caliber project teams composed of engineers with deep technical expertise and domain knowledge, providing significant opportunities for learning, growth, and career advancement. We support cross-training in BPM, RPA, and related technologies through certification reimbursement programs.

Luxoft offers a competitive compensation and benefits package, including industry-leading insurance coverage in India. As you advance your career with Luxoft, you may also have the opportunity to pursue roles at our international offices through our Internal Mobility program.

Responsibilities:

- Collaborate with business partners to gather and analyze requirements.

- Design, develop, configure, test, deploy, implement, maintain, and enhance custom BPM workflows using Appian across the enterprise.

- Design and implement complex enterprise integrations with LDAP, Active Directory, and other internal systems.

- Design and develop database objects to support BPM applications.

- Maintain database performance by identifying and resolving production and development issues.

- Participate in workflow analysis and modeling using SQL Server and SQL Management Studio.

- Translate BPM requirements into Appian process model prototypes and solutions ensuring quality and performance.

- Deliver projects using Agile or Waterfall methodologies as specified.

- Conduct and participate in detailed design reviews to ensure compliance with approved architecture.

- Engage in daily activities of the Appian BPM development teams.

- Support enhancements to Appian applications, user access management, deployments, and database performance management.

- Collaborate with application support teams during development, deployment, and support phases.

Mandatory Skills Description:

• Possess a bachelor's degree in Computer Science, Engineering, or a related technical field from an accredited university or college..

• Have 4-6 years of software engineering experience, demonstrating proficiency in one or more of the following technologies: Appian, Scripting, REST API services, Java and JavaScript.

• Completed end-to-end implementation for at least 2 real-life Appian projects.

• Exhibit expertise in integrations utilizing Web API, Integrations, with the capability to tailor these functionalities to suit external system requirements.

• Showcase a robust grasp of database principles, coupled with practical experience in Stored Procs, MySQL or SQL Server.

• Demonstrate experience in Appian Process Models, Rules & Expressions, Data Management including Complex Data Types, XSDs, SQL, Inter Process Communication, RBAC, and Process Reporting on Appian 20.X and above.

• Possess Appian Certification as per your experience level.

• Embrace an agile mindset and have a level of familiarization with Agile methodologies along with having a knack for crafting solutions that facilitate business process automation.

• Offer a blend of technical prowess, strong business acumen, leadership abilities, and a track record of effective knowledge transfer.

Nice-to-Have Skills Description:

SQL, Integrations, Agile Methodology, Scripting

About B2Spin

We are B2Spin, and we are dedicated to delivering the best Free-to-Play Social Casino and gaming experiences by creating captivating, engaging, and unique products that are accessible to everyone. We have built a team of talented professionals from all over the globe, who are working to continually improve the experiences of our players. We are not looking to just be part of the industry, but to revolutionize it.

AI-Driven Engineering Culture

We are actively building an AI-driven engineering organization with a clear and deliberate stance: artificial intelligence is a core part of how we build and deliver software — not an experiment, not a trend, and not an optional add-on.

AI is embedded into our engineering workflows, from system design and prototyping to refactoring, testing, and code review. We expect engineers to be fully comfortable working in AI-driven environments and to treat AI as a primary productivity multiplier. Strong engineering judgment, architectural ownership, and accountability remain essential—AI amplifies our engineers, it doesn’t replace responsibility for technical decisions.

What you will be doing
• Design, evolve, and maintain core libraries, framework extensions, and shared components used across all engineering teams
• Take ownership of system performance, scalability, and high-load architecture, ensuring core services can handle massive throughput with low latency
• Proactively monitor production behavior, investigate complex application/database performance bottlenecks, and introduce advanced metrics, dashboards, and alerting systems
• Establish and advocate for best practices in concurrency, memory management, and resource utilization across the backend ecosystem
• Collaborate with cross-functional teams including backend, web, mobile, QA, and product teams
• Take ownership of specific functional areas within our large-scale architecture
• Leverage AI tools and assistants as integral parts of your development workflow—from system design to code review
• Contribute to maintaining high test coverage, predictable production behavior, and seamless scalability
• Drive engineering excellence through modern practices and continuous improvement

What we are looking for
• Deep, low-level understanding of Java internals (JVM, GC behavior, memory management, concurrency/multithreading, and performance profiling)
• Advanced knowledge of relational databases (PostgreSQL), including query optimization, indexing strategies, locking mechanisms, and connection pooling under heavy load and distributed systems architecture, specifically high-throughput event streaming with Kafka (partitioning, replication, consumer group rebalancing, and tuning).
• Strong system design, troubleshooting and debugging capabilities
• Comfortable and proactive in using AI coding assistants (GitHub Copilot, Claude Code, etc.) as productivity multipliers
• Practical experience validating, refining, and taking ownership of AI-generated output
• Upper-intermediate or higher level of English

Nice to have:
• Proven track record of building or maintaining shared libraries, SDKs, or internal tooling in a large-scale engineering organization.
• Hands-on experience with APM tools and observability stacks (Prometheus, Grafana, ELK) with the ability to define meaningful SLOs/SLIs, custom metrics, and proactive alerts.

Main technologies: Java, Spring, Spring Boot, Ebean-ORM, Quartz, Maven, Resteasy, Flyway, PostgreSQL 15, HTTP/Websockets, Netty, K8S/Docker, GCP, Jenkins, ELK, Grafana.

Numerical Technologies Ltd is a leading provider of custom software solutions and services specializing in risk, limits, and regulatory capital. Right now, we are looking for a Principal Java Engineer to join our team.

What you will be doing:

As part of the team, you will contribute to a strategic modernization initiative for a leading multinational financial services company. You will design, develop, and support scalable Java solutions while making key architectural decisions as the platform evolves from a monolithic application to a microservices architecture.

Working closely with product and engineering teams, you will design new service-based solutions, define service boundaries and integrations, build fault-tolerant services, and ensure high code quality through testing, code reviews, and system design.

Project: Modernization of a monolithic platform into a microservices architecture. Java services provide authentication, logging, and data management, while Python services implement core computational logic. The role combines hands-on development with architectural ownership of new solutions derived from existing business capabilities.

What we’re looking for:

• 5+ years of experience in Java development, preferably in FinTech.
• Strong experience with Java and Spring Framework.
• Solid understanding of microservices architecture and design patterns.
• Proficient in SQL (Oracle, PostgreSQL).
• AWS experience and Python knowledge are a plus.
• Ability to work independently and take ownership of technical and architectural decisions.
• Bachelor's degree or higher required.
• Upper-intermediate English level or higher.

What we offer:

• Competitive compensation depending on experience and skills.
• Regular assessments and salary reviews.
• Paid personal days.
• Mental health support program.
• Partial gym compensation.
• Language classes.
• Flexible working schedule.

PioGroup Software is a team of professionals passionate about building reliable digital products. We are looking for an experienced Strong Middle Blockchain Engineer with strong production experience working with the Bitcoin protocol and Bitcoin wallet/custody infrastructure.

The main focus of the role is developing and maintaining Bitcoin wallet infrastructure, including UTXO management, transaction construction and signing, PSBT, SegWit, multi-signature flows, fee management, and transaction lifecycle handling.

For this position, hands-on production experience specifically with the Bitcoin protocol is essential. General blockchain or Web3 experience alone is not sufficient.

Requirements

• 3+ years of production experience with Bitcoin / BTC infrastructure.
• Hands-on experience with Bitcoin-based protocols, UTXO model, PSBT, and BIP standards.
• Strong experience with Java, Spring Boot, and SQL.
• Experience working with production wallet or custody infrastructure.
• Good understanding of TDD and/or BDD practices.
• Familiarity with Domain-Driven Design principles.
• Experience working in a monorepo environment with shared libraries and coordinated CI/CD pipelines.
• Professional written and spoken English.
• Proactive communication and ability to raise blockers, technical concerns, and cross-team dependencies.

Bitcoin Protocol Expertise

We expect strong practical knowledge of:

• PSBT and BIP-174.
• UTXO management and coin selection.
• SegWit transaction structures.
• Bitcoin script types and descriptor formats.
• HD wallets and derivation paths.
• BIP-48 and BIP-67.
• P2WSH and multi-signature transaction flows.
• PSBT combination, signing, and finalisation.
• Witness data and BIP-143.
• DER signature encoding, low-S enforcement, and sighash types.
• UTXO indexing and balance calculation.
• Address discovery, gap limits, change address allocation, and address reuse prevention.

Transaction Lifecycle & Fee Management

Production experience with:

• Mempool monitoring.
• Fee estimation and fee-rate prediction.
• RBF (Replace-By-Fee).
• CPFP (Child-Pays-For-Parent).
• Stuck transaction detection.
• Transaction replacement and rebroadcasting.
• Confirmation monitoring.
• Double-spend detection.
• UTXO consolidation during low-fee periods.

Candidates should also clearly understand the operational difference between a transaction being:

• Broadcast.
• Accepted into the mempool.
• Confirmed.
• Confirmed at depth N.

A strong understanding of Bitcoin probabilistic finality, dust limits, fee spikes during network congestion, and the behaviour of unconfirmed transactions is also required.

Responsibilities

• Develop and maintain Bitcoin wallet infrastructure.
• Manage UTXOs and wallet balances.
• Construct Bitcoin transactions.
• Work with PSBT and SegWit.
• Implement multi-signature transaction flows.
• Handle fee estimation and fee bumping using RBF and CPFP.
• Monitor mempool activity and transaction lifecycle.
• Implement deposit detection and address-level balance monitoring.
• Support wallet recovery and descriptor-based address discovery.
• Participate in technical design and architecture decisions.
• Collaborate with other engineering squads and shared platform components.

Nice to Have

• Experience with multiple blockchain protocols.
• Experience with institutional-grade custody or wallet platforms.
• Experience working with systems processing high volumes of Bitcoin transactions.

Important: we are specifically looking for candidates with documented commercial experience working with the Bitcoin protocol, including UTXO management, PSBT, SegWit, BIP standards, and the Bitcoin transaction lifecycle. Testnet-only, personal wallet, or exclusively Ethereum/Web3 experience will not be sufficient for this role.

About Us

Smart Capital Center is an end-to-end, AI-powered platform for Commercial Real Estate (CRE) investment and financial management. We power real-time underwriting, asset management, and portfolio analytics through a combination of live data, workflow automation, and AI-driven insights.

Operating at the intersection of Generative AI, finance, and real estate, we are building systems that digitize and simplify complex financial workflows.

Our clients include leading institutions such as JLL, Pacific Life Insurance Company, and KeyBank. We are a lean, high-performance team building category-defining technology in a $17 trillion industry.

To learn more about our platform and vision, please visit our website.

The Role

We are looking for a Backend Software Engineer with strong experience in building scalable systems and a deep interest in AI-powered applications.

This is a high-impact, hands-on role where you will design and build backend services, integrate AI capabilities, and develop intelligent, agent-driven workflows used in real-world production environments.

You will work closely with product, AI, and engineering teams to deliver reliable, high-performance systems and automation features.

What You Will Do

Backend Development

• Design, build, and maintain backend services using Java (Spring Boot) and Python
• Develop scalable APIs and microservices for data-intensive applications
• Optimize system performance, reliability, and scalability
• Design efficient data models and handle complex integrations

AI & Intelligent Systems

• Implement and integrate AI-powered features into core products
• Design and build agent-based workflows for automation and decision-making
• Apply prompt engineering techniques to improve LLM outputs and behavior
• Work with modern AI frameworks to productionize intelligent systems

Cloud & Infrastructure

• Develop and deploy backend systems on AWS (EC2, S3, RDS, Lambda, etc.)
• Build resilient, scalable cloud-native services
• Contribute to system monitoring, logging, and reliability

System Design & Engineering Excellence

• Contribute to architecture, service boundaries, and system design decisions
• Write clean, maintainable, and well-documented code
• Ensure security, performance, and operational stability
• Continuously improve engineering quality and development practices

Collaboration

• Work closely with frontend, product, and AI teams
• Contribute to end-to-end feature delivery
• Participate in Agile development processes

Requirements

• 5+ years of backend software development experience
• Strong experience building and scaling backend systems in production

Core Technical Skills

• Strong experience with Java and Spring Boot
• Solid experience with Python
• Strong knowledge of SQL and database design (PostgreSQL preferred)
• Experience building REST APIs, microservices, and distributed systems
• Hands-on experience with AWS (EC2, S3, RDS, Lambda, etc.)
• Proficiency with Git and modern development workflows

AI & Modern Development Experience

• Experience with prompt engineering for LLM-based systems
• Practical experience building AI agent workflows in production
• Familiarity with frameworks/tools such as:
  • LangGraph
  • LangChain
  • LangSmith
  • or similar ecosystems
• Experience using AI-assisted development tools, such as:
  • Claude Code
  • Codex
  • OpenCode
  • or similar

Nice to Have

• Experience with vector databases or semantic search (e.g., Milvus)
• Knowledge of RAG (Retrieval-Augmented Generation) architectures
• Experience with CI/CD pipelines and DevOps practices
• Familiarity with event-driven architecture

• Experience with data processing pipelines or document AI systems

   

Why Join Us

• Work on cutting-edge AI-powered systems in a $17T industry
• Build real-world applications using LLMs, agents, and automation
• High ownership and autonomy with meaningful technical impact
• Opportunity to influence system design and engineering direction
• Fast-moving, execution-focused team with minimal bureaucracy
• Competitive compensation and flexible work environment

About Our Client

Our client is a leading enterprise data platform company building an open, high-performance data lakehouse for AI and analytical workloads. The platform combines an intelligent SQL query engine, an AI-ready semantic layer, and an open catalog built on Apache Iceberg — enabling Fortune 500 companies across finance, energy, manufacturing, and logistics to unify, query, and govern data at massive scale across cloud and on-premise sources.

About the Role

We are looking for a Senior Software Engineer for the data catalog and enterprise data management layer of a large-scale lakehouse platform — the services that automate data ingestion and autonomously optimize Apache Iceberg tables. You will own features through the full development cycle, from design through deployment, in a multithreaded, distributed environment where scalability, performance, and always-on availability are the baseline expectations.

This is a systems-level, backend engineering role focused on data infrastructure internals — not application development or CRUD services.

Responsibilities

• Own the full software development cycle — inception, design, development, testing, deployment — for catalog and data-management services
• Build and operate services for automated ingestion and autonomous optimization of Apache Iceberg tables
• Reason about concurrency and parallelization to deliver scalability and performance in multithreaded, distributed systems
• Drive performance tuning and system-efficiency improvements
• Work with Apache Foundation open-source projects, contributing upstream where agreed
• Participate in code and design reviews, upholding a high engineering bar
• Collaborate with product managers, support teams, and solution architects on feature requests and design updates
• Partner with US-based engineering leads on technical decisions

Required Qualifications

• B.S., M.S., or PhD in Computer Science or a related field
• 5+ years of software engineering experience, preferably focused on database systems or related fields
• Strong object-oriented programming skills in Java or C++
• Solid grounding in data structures and algorithms
• Hands-on experience with multithreaded and asynchronous programming patterns for scalable, performant systems
• A passion for engineering quality — zero-downtime upgrades, availability, resiliency, and uptime as first-class concerns
• Comfort with a fast-moving environment; strong ownership; the confidence to defend a technical position and the openness to be mentored
• Comfortable with AI-assisted development workflows — using modern AI tools productively while critically validating their output
• English Upper-Intermediate or higher (B2+) — daily written and verbal communication with a US-based engineering team
• Availability to work EU business hours shifted 2–3 hours later for daily overlap with US West Coast mornings

Desired Skills

• Database internals and query planning
• Distributed systems: concurrency control, data replication, storage systems
• Apache Iceberg or other open table formats (Delta Lake, Hudi)
• Messaging systems: Kafka, NATS, or cloud pub/sub services
• Contributions to open-source data infrastructure (Apache projects especially valued)

Details

• Engagement: Long-term contract
• Location: Europe (EU / EEA / UK), remote
• Working hours: EU business hours, shifted 2–3 hours later for daily overlap with the US West Coast team

Job Description

• 5 or more years relevant work experience with BS, or 3 or more years or relevant work experience with MS Degree in Computer Science, Electrical Engineering or related field
• Experience across full software development life-cycle including design, requirements, implementation, andtest
• Java, JavaScript/TypeScript and script programming languages
• Strong development skills with databases and SQLs
• Practical experience working within an Agile/Scrum based environment
• Familiar with AWS services for example S3, ECS, EKS, MSK, VPC, RDS, etc
• Knowledge of Kafka

Job Responsibilities

• Designs, develops, debugs, modifies, tests software programs using Java, Scripting and other current programming languages, methodologies and technologies.
• Perform hands-on Java Development, adoption of modern software engineering & delivery practices using Java, Spring Boot REST/Microservices, AWS.
• Documents software development and/or test development by writing documents, reports, memos, change requests. Methods used are determined by approved procedures and standards
• Tracks software development effort by creating and maintaining records in the approved tracking
  management tool.
• Solves engineering problems by analyzing the situation and recommending corrective or alternative actions.
• Analyzes, evaluates, verifies requirements, software and systems by using software engineering practices.
• Investigates, researches, selects software designs, operating systems and/or practices.
• Continuously improves process and work methodologies by interfacing with peers/cross-functional groups and analyzing activities to improve workflow and work processes.
• Directs support personnel and project activities.
• In all actions, demonstrates a primary commitment to patient safety and product quality by maintaining compliance to the Quality Policy and all other documented quality processes and procedures.
• Represents organization as a prime contact on contracts or projects. Uses discretion, diplomacy, and tact to
  resolve difficult situations. May escalate serious issues to manager.
• Participates in the development of less experienced staff by setting an example, providing guidance, and
  offering counsel.

Department/Project Description

Our customer is an American manufacturer and globally recognized leader in Healthcare and Medical Devices. In close cooperation with the international team you will have the ability to participate in product feature definition, development, testing, and post-release support for innovative medical products.

Blackthorn Vision is seeking a Middle Strong/Senior Backend Developer (Java) for an outstaff project with a global leader in energy technology. Founded in 1926 and headquartered in Houston, Texas, the company has 100,000 employees serving customers in more than 120 countries and develops software solutions for automation across the energy and industrial sectors.

You will work as part of an international team, collaborating with Blackthorn Vision specialists, client-side engineers, and management. We are looking for a self-driven team player with strong problem-solving skills, a commitment to quality, and a passion for delivering robust and maintainable software solutions. Upper-Intermediate English or higher is required for effective day-to-day communication. The position follows a regular full-time working schedule aligned with the Ukrainian time zone.

In this role, you will build and support backend services that process operational and time-series data and deliver reliable APIs and event-driven solutions. You will work with technologies such as Kafka, Azure IoT Hub, RabbitMQ, Redis, Kubernetes, and Microsoft Azure to develop high-performance, resilient, and scalable applications.

Required Qualifications:

• 4+ years of professional software development experience.
• Strong hands-on experience with Java, Spring Framework, and Spring Boot.
• Basic experience with Node.js and TypeScript.
• Experience with Microservices Architecture, Event-Driven Architecture, and REST APIs.
• Strong understanding of system architecture and business requirements.
• Hands-on experience with Kafka and RabbitMQ.
• Experience with PostgreSQL, Cassandra, Redis, or similar relational/NoSQL databases.
• Experience with Docker, Kubernetes, Microsoft Azure, and Azure IoT Hub.
• Experience with CI/CD, DevOps practices, and modern observability tools.
• Experience using AI-assisted development tools such as GitHub Copilot, Microsoft Copilot, Cursor, or similar.
• Excellent problem-solving, communication, and collaboration skills.

Nice to have:

• Experience working with operational and time-series data.
• Bachelor’s degree in Computer Science, Software Engineering, Information Technology, or a related field.

Please note: We are open to considering candidates based abroad; however, cooperation is available only under Ukrainian contracting arrangements.

• You will join a Regulatory Reporting Platform within a large US investment bank. The platform is responsible for collecting, processing, and transforming large volumes of data from multiple internal systems to produce regulatory reports for 240 jurisdictions worldwide. In total, the platform supports around 10,000 reports across a wide range of regulatory, compliance, financial, and risk reporting areas.
  This is a large-scale, business-critical data platform operating in a highly regulated environment, where data accuracy, quality, traceability, and timely delivery are essential. The team works on building and enhancing data pipelines, implementing reporting logic, ensuring data validation and reconciliation, and supporting the generation of complex regulatory outputs.
  The project is delivered by a global distributed team with colleagues located in Ukraine, Poland, and the US, offering close collaboration with engineers, analysts, and business stakeholders across multiple regions.

   

• Responsibilities:

  - Design, develop, and maintain solutions for a large-scale Regulatory Reporting Platform
  - Build and enhance data processing pipelines using Java and Apache Spark
  - Implement scalable logic for data ingestion, transformation, aggregation, and enrichment from multiple internal data sources
  - Develop and optimize batch processing jobs to support the generation of regulatory reports across multiple jurisdictions
  - Ensure high standards of data quality, validation, reconciliation, and consistency throughout the reporting lifecycle
  - Translate business and regulatory requirements into robust technical solutions
  - Collaborate with business analysts, QA engineers, and cross-functional teams to deliver reporting functionality
  - Investigate and resolve data and application issues in development, test, and production environments
  - Improve application performance, scalability, and reliability for high-volume data processing workloads
  - Contribute to the design and implementation of reusable components and engineering best practices
  - Participate in code reviews, testing, and release activities to ensure high-quality deliverables
  - Work closely with distributed teams across Ukraine, Poland, and the US in an agile delivery model
  - Support continuous improvement of the platform, including monitoring, troubleshooting, and operational stability

   

• Mandatory Skills Description:

  - 6+ years of commercial experience with Java
  - Experience in designing and developing scalable, high-performance backend applications
  - Good knowledge of SQL and working with large datasets from multiple data sources
  - Strong problem-solving skills and ability to work effectively in a global distributed team

   

• Nice-to-Have Skills Description:

  - Experience in financial services, investment banking, or regulatory reporting projects
  - Familiarity with data quality, reconciliation, and control frameworks
  - Experience working with large-scale enterprise data platforms
  - Knowledge of cloud environments and modern data platform architectures
  - Understanding of CI/CD practices and automated deployment pipelines
  - Experience working in Agile / Scrum teams within a distributed global setup

   

• Languages:
  • English: B2 Upper Intermediate

Company Description
 

Join Sigma Software as a Principal Software Engineer and help shape secure, large-scale digital platforms for Public Sector initiatives. This is a strategic senior-level role for an experienced engineering leader who can combine hands-on development, architecture expertise, technical leadership, and customer-facing communication.
 

You will work with enterprise-grade Java-based solutions, participate in presales and discovery activities, define technical strategies, and guide teams through project launch and early delivery stages.
 

We at Sigma Software create impactful solutions for global Customers and support our engineers with professional growth opportunities, mature engineering culture, and the ability to influence projects from the earliest stages.
 

CUSTOMER

Our Customers operate within Public Sector environment where security, reliability, scalability, and regulatory compliance are critical. The projects focus on building and modernizing enterprise digital services that support mission-critical operations, complex integrations, and long-term maintainability for large-scale organizations.
 

PROJECT

You will join early-stage initiatives where technical leadership plays a key role in transforming business ideas into scalable implementation strategies. The position involves participation in presales activities, tenders, discovery workshops, architecture design, estimation, and project launch support.

The projects include enterprise Java ecosystems, cloud-native infrastructure, distributed systems, secure integrations, and modernization of legacy platforms. You will work closely with Customers, Sales, Delivery, and engineering teams to establish architecture standards and ensure successful project initiation.

Responsibilities:

• Participate in presales activities, discovery sessions, technical workshops, tenders, and RFI/RFP analysis.
• Translate business requirements into scalable technical solutions and implementation strategies.
• Design enterprise-level architectures for Java-based distributed systems and microservices platforms.
• Prepare technical proposals, estimations, architecture diagrams, delivery assumptions, and implementation roadmaps.
• Define technology stack, infrastructure approach, integrations, security principles, and team composition.
• Present and defend technical solutions during Customer discussions and stakeholder meetings.
• Support Sales and Delivery teams during presales and project initiation phases.
• Lead technical project start-up activities and transform high-level concepts into actionable implementation plans.
• Establish architecture standards, engineering guidelines, and development best practices.
• Guide engineering teams during the first delivery stages and support onboarding and technical interviews.
• Conduct architecture and code reviews to ensure scalability, maintainability, and security compliance.
• Resolve complex technical challenges and mentor Senior and Lead Engineers.
• Drive technical decision-making while balancing business goals, delivery timelines, and quality expectations.

Requirements:

• 5+ years of software engineering experience with strong technical leadership responsibilities.
• Strong hands-on expertise in Java ecosystem development.
• Deep knowledge of Spring and Spring Boot.
• Strong understanding of microservices and distributed systems architecture.
• Experience designing and implementing REST APIs and event-driven systems.
• Practical experience with Kafka or similar messaging technologies.
• Experience with relational and NoSQL databases.
• Strong cloud platform experience with AWS, Azure, or GCP.
• Experience with Docker, Kubernetes, CI/CD pipelines, and infrastructure automation.
• Understanding of application security, monitoring, logging, and observability practices.
• Experience working with incomplete or ambiguous requirements and converting them into technical solutions.
• Experience participating in presales, discovery phases, solution proposals, or tender processes.
• Strong estimation and solution design skills.
• Excellent Customer-facing communication and presentation skills.
• Ability to independently drive technical initiatives and take ownership.
• Upper - Intermediate English level.

Приєднуйтесь до Sigma Software на позицію Principal Software Engineer та допомагайте створювати безпечні цифрові платформи великого масштабу для ініціатив у сфері Public Sector. Це стратегічна позиція senior-рівня для досвідченого інженерного лідера, який може поєднувати розробку, архітектурну експертизу, технічне лідерство та комунікацію з клієнтами.
 

Ви працюватимете з enterprise-рішеннями на базі Java, братимете участь у presales та discovery-активностях, визначатимете технічні стратегії та супроводжуватимете команди під час запуску проєктів і на ранніх етапах реалізації.

У Sigma Software ми створюємо значущі рішення для глобальних Клієнтів та підтримуємо наших інженерів можливостями професійного розвитку, зрілою інженерною культурою та можливістю впливати на проєкти з найперших етапів.
 

КЛІЄНТ

Наші Клієнти працюють у сфері Public Sector, де безпека, надійність, масштабованість та відповідність нормативним вимогам мають критичне значення. Проєкти зосереджені на створенні та модернізації enterprise-цифрових сервісів, які підтримують критично важливі операції, складні інтеграції та довгострокову підтримуваність для великих організацій.

ПРОЄКТ

Ви приєднаєтесь до ініціатив на ранніх етапах, де технічне лідерство відіграє ключову роль у перетворенні бізнес-ідей на масштабовані стратегії реалізації. Позиція передбачає участь у presales-активностях, тендерах, discovery-воркшопах, проєктуванні архітектури, оцінюванні та підтримці запуску проєктів.

Проєкти включають enterprise Java-екосистеми, cloud-native інфраструктуру, розподілені системи, безпечні інтеграції та модернізацію legacy-платформ. Ви тісно співпрацюватимете з Клієнтами, Sales, Delivery та інженерними командами для встановлення архітектурних стандартів та забезпечення успішного запуску проєктів.

Обов’язки:

• Брати участь у presales-активностях, discovery-сесіях, технічних воркшопах, тендерах та аналізі RFI/RFP.
• Перетворювати бізнес-вимоги на масштабовані технічні рішення та стратегії реалізації.
• Проєктувати архітектуру enterprise-рівня для розподілених систем та мікросервісних платформ на базі Java.
• Готувати технічні пропозиції, оцінки, архітектурні діаграми, припущення щодо реалізації та дорожні карти.
• Визначати технологічний стек, підхід до інфраструктури, інтеграції, принципи безпеки та склад команди.
• Презентувати та захищати технічні рішення під час обговорень із Клієнтами та зустрічей зі стейкхолдерами.
• Підтримувати Sales та Delivery команди під час presales та етапів запуску проєктів.
• Керувати технічними активностями на старті проєкту та перетворювати високорівневі концепції на практичні плани реалізації.
• Встановлювати архітектурні стандарти, інженерні рекомендації та найкращі практики розробки.
• Керувати інженерними командами на перших етапах реалізації та підтримувати онбординг і технічні інтерв’ю.
• Проводити архітектурні та code review для забезпечення масштабованості, підтримуваності та відповідності вимогам безпеки.
• Вирішувати складні технічні завдання та менторити Senior і Lead Engineers.
• Керувати процесом прийняття технічних рішень, балансуючи бізнес-цілі, терміни реалізації та очікування щодо якості.

Вимоги:

• 5+ років досвіду у software engineering із сильними обов’язками у сфері технічного лідерства.
• Сильна практична експертиза у розробці в Java-екосистемі.
• Глибокі знання Spring та Spring Boot.
• Глибоке розуміння архітектури мікросервісів та розподілених систем.
• Досвід проєктування та реалізації REST API та event-driven систем.
• Практичний досвід роботи з Kafka або аналогічними технологіями обміну повідомленнями.
• Досвід роботи з реляційними та NoSQL базами даних.
• Сильний досвід роботи з хмарними платформами AWS, Azure або GCP.
• Досвід роботи з Docker, Kubernetes, CI/CD pipeline та автоматизацією інфраструктури.
• Розуміння безпеки застосунків, моніторингу, логування та практик observability.
• Досвід роботи з неповними або неоднозначними вимогами та перетворення їх на технічні рішення.
• Досвід участі у presales, discovery-фазах, підготовці solution proposals або тендерних процесах.
• Сильні навички оцінювання та проєктування рішень.
• Відмінні навички комунікації та презентації у взаємодії з Клієнтами.
• Здатність самостійно вести технічні ініціативи та брати на себе відповідальність.
• Рівень англійської — Upper-Intermediate.

AsiaFinance Group is a fast-growing group of fintech companies operating in Asia. Our core business is digital consumer lending.

Position: Java Developer 
Location: Remote (Global)
Reported to: Chief Product Officer

About the Role

As a Middle–Senior Java Developer, you will be responsible for designing, developing, and maintaining backend services that power our lending platforms and internal systems. You will work closely with product, engineering, and infrastructure teams to deliver high-quality software while contributing to architecture decisions, system reliability, and continuous improvement initiatives.

This role is ideal for an experienced developer who enjoys solving complex technical challenges, writing clean and maintainable code, and working in a remote, international environment.

What You'll Do

• Design, develop, and maintain backend applications and services using Java and Spring Framework.
• Build scalable, secure, and high-performance APIs and business services.
• Participate in system design, code reviews, and technical discussions.
• Write clean, maintainable, and well-tested code following software engineering best practices.
• Develop and maintain integrations with internal and external systems.
• Optimize application performance, database queries, and system reliability.
• Implement caching, monitoring, logging, and observability solutions.
• Support production deployments, troubleshooting, and incident resolution.
• Collaborate with Product Managers, QA Engineers, DevOps Engineers, and other developers throughout the software development lifecycle.
• Contribute to technical documentation, architecture improvements, and coding standards.
• Participate in Agile development processes, sprint planning, and retrospectives.
• Continuously improve code quality, development practices, and team efficiency.

What We're Looking For

• Bachelor's degree in Computer Science, Software Engineering, Information Technology, or a related field.
• Strong experience with Java 11+ and Spring Framework (Spring Boot, MVC, Data, Security).
• 4+ years of commercial Java development (Java 11+)
• OOP and SOLID principles — applied daily, not just understood theoretically
• Clean code and refactoring discipline — we improve the codebase, not just add to it
• TDD mindset: unit and integration tests are part of done, not an afterthought
• SQL and relational databases — writing, reviewing, optimising queries and schemas
• REST API integrations — consuming and exposing
• Caching strategies — Redis or equivalent, knowing when and why to apply them
• Data encryption basics — at rest and in transit
• Telemetry and observability — structured logs, metrics, basic alerting
• Git — branching, PR workflow, code review participation
• CI/CD basics — pipeline awareness, build and deploy cycle familiarity
• JVM fundamentals — threading model, memory management basics
• Linux comfort — reading logs, basic shell, deployment tasks

Nice to Have

• Experience with AWS services such as EC2, RDS, S3, and load-balanced environments.
• Familiarity with message brokers, distributed systems, and microservices architecture.
• Experience with monitoring and observability tools such as Grafana, Kibana, or similar platforms.
• Previous experience in fintech, financial services, or high-availability production systems.
• Experience working in distributed international teams.

Why Join Us

• International team with a flat, Western-style corporate culture
• Real ownership across the full BA and QA lifecycle from day one
• Fast career progression in a high-growth, cross-border fintech environment
• Collaborative, energetic team with frequent cross-functional interaction

This role focuses on executing critical migration projects within the backend infrastructure. The Backend Infrastructure team is undertaking several large-scale migrations to modernize its systems, improve reliability, and reduce maintenance overhead. This TVC position will be instrumental in performing the hands-on work required for these migrations, working closely with the infrastructure team and other BackEnd teams.

Required Qualifications:

• Ability to work from our Warsaw office
• 5+ years of hands-on experience in Java programming.
• Familiarity with Python.
• Strong communication and interpersonal skills, with the ability to collaborate effectively within a technical team environment.
• At least Upper-Intermediate level of both spoken and written English

• Bachelor’s degree in Computer Science, Software Engineering, or a related technical field, or equivalent practical experience.

   

Nice-to-Haves:

• Experience with build tools such as Gradle, Maven, or Bazel.
• Experience with building data pipelines.
• Knowledge of Google Cloud Platform (GCP) services.

Responsibilities

• Execute Migrations: Actively participate in and drive the execution of large-scale code and system migrations across various backend services. Some examples include: 
  • Importing or upgrading third-party dependencies.
  • Building projects on GoB(Gerrit-on-Borg).
  • Performing necessary code and dependency changes in backend projects
• Code Modification and Updates: Update and refactor existing codebases (primarily Java) to align with new libraries, platforms, and infrastructure.
• Testing: Work with the Infrastructure team to create a testing plan for migrations to ensure that changes do not break running services and execute the test plans.  
• Collaboration: Work closely with the  Backend Infrastructure team and other BE software engineers to understand migration requirements, plan execution strategies, and ensure smooth transitions with minimal disruption.
• Problem Solving: Investigate, debug, and resolve technical issues and complexities encountered during the migration processes.
• Documentation: Maintain clear and concise documentation for migration plans, processes, changes made, and outcomes.
• Best Practices: Adhere to software development best practices, ensuring code quality, and follow established guidelines for infrastructure changes.

We offer:

• Opportunity to work on a global product used by 100+ million users worldwide.
• Competitive compensation package, including 20 paid vacation days and paid sick leave.
• Full-time office-based work (5 days per week) in a modern, comfortable office in Warsaw.
• Flexible working hours with a healthy work-life balance.
• Private medical insurance.
• English classes with a native speaker and wellness activities, including online yoga.
• Paid tech training and other activities for professional growth;
• Modern, comfortable office and a friendly, supportive engineering culture.
   
  If your qualifications and experience match the requirements of the position, our recruitment team will reach out to you in a week maximum. Please rest assured that we carefully consider each candidate, but due to the amount of applications, the review and further processing of your candidacy may take some time.