Jobs Java

Project description

We are building the platform, which supports various information gathering and processing across the bank. The PMC application, Price Master Central (PMC) is a global reference data management application - responsible for sourcing securities/Pricing data from market vendors and internal sources and providing it to downstream clients after applying client specific rules.

Responsibilities

Manage a team

Intensive communication with project stakeholders and other teams

Evaluate and adopt new development tools, libraries and approaches to improve delivery quality

Continuous quality improvement (code reviews, fixing Sonar issues, unit/integration/E2E test coverage)

Integrate our components with different internal and external client's systems

Configure, monitor, and troubleshoot Application servers

Monitor applications, processes, scheduled jobs, collect different types of logs and metrics

Setup and improve CI/CD

Automate routine with scripting languages

Write all types of tests: unit, integration, end-to-end

Design distributed applications

Skills

Must have

Technically strong energetic individual, who can bring innovation to the group

Team lead experience from 3 years, IT experience from 7 years

Java (Core, JDBC, MT, Collections, I/O), Spring Boot

SQL.PL-SQL on Oracle DB

Container platform based on Kubernetes

REST web services, Kafka, Redis

Unix Commands and shell scripting.

Familiarity with standard data structures and algorithms.

Experience using the following tools

JIRA, Harness/uDeploy, SonarQube, TeamCity, Artifactory, Git (GHE & Bitbucket)

Logical thinking, strong analytical and problem-solving skills; innovate and solutions oriented

Effective time management skills to manage multiple priorities with flexibility on time zones and timelines

Excellent verbal and written communication skills

Bachelor's degree in computer science or equivalent work experience

Nice to have

Master's degree in computer science or equivalent work experience

Experience working with the Scrum methodology

Experience working with a NoSQL database

Experience designing and implementing microservices

Financial services technology experience preferably in reference data

Languages

English: C1 Advanced

Ajax Systems, an international tech company and the largest manufacturer of security systems in Europe.

We are looking for a new team member to join our System devisions as a Senior Java Developer.

The System Division is responsible for building and developing the Ajax software ecosystem. The team develops and maintains OS Malevich and the Video Management System, builds scalable cloud infrastructure, and creates client applications for multiple platforms, ensuring that all system components work together as a unified ecosystem.

The division works with Java, Kotlin, Swift, C, C++, and Python. It includes embedded, cloud, mobile, and desktop engineers who ensure the stable operation of Ajax as a single digital platform.

Responsibilities:

Core Development:

• Design and implement core backend services and data pipelines
• Write clean, readable, and maintainable code
• Develop services for the b2b product line

Architecture & Documentation:

• Actively participate in developing and improving architecture
• Document architectural decisions and operational knowledge for successful deployment and service operations

Quality Assurance:

• Ensure appropriate test coverage with unit and integration testing
• Focus on performance and cost efficiency for areas of responsibility
• Follow best practices in software design and development and promote them within the team

Operations & Monitoring:

• Ensure reliable alerting, dashboards, and runbooks for production services
• Debug production issues, analyze complex cases, and conduct investigations

Collaboration & Culture:

• Work smoothly in a technical culture with testing, CD, and DevOps

• Collaborate within the team and with other engineering teams to develop new features and products according to business needs

   

Requirements:

• Java: 5+ years of professional backend development in enterprise environment
• Kotlin: Knowledge and practical work experience
• Java Concurrency: Strong understanding and practical application experience
• Understanding of SOA, microservice, and event-driven architecture
• Cloud development principles with practical AWS experience

• Ability to scale and ensure high availability of loaded systems

   

Required:

• Any NoSQL database
• Any message broker
• Enterprise-grade stack (messaging brokers, in-memory storages, NoSQL, key-value databases)
• Docker and Kubernetes (containerized applications)

• Git, Gradle, Jenkins

   

Nice to Have:

• Redis, Netty, Akka, gRPC, Project Reactor, NATS, Kafka. MongoDB

• Strong knowledge of unit testing and automated test paradigms

   

We offer:

• The opportunity to suggest and implement your own ideas that directly influence the product and its mass production
• A place in a fast-growing company with a motivated and professional team
• Competitive salary
• Medical insurance
• English classes
• The opportunity to participate in Ajax’s internal beta-testing program for security systems
• Discounts from partner companies

• Discounts on Ajax products

   

Ajax Systems is a Ukrainian success story that has grown into a global product. Ajax devices are trusted by more than 4.5 million end users and 330,000 PRO users in over 180 countries. The company provides comprehensive solutions to protect residential and commercial properties of all sizes. Today, Ajax portfolio includes 280 devices for intrusion protection, video surveillance, fire safety, and comfort and automation.

Project description

Developed product is the leading software system in Energy domain covering all aspects of Oil&Gas production from geological exploration to optimization of ongoing production. Our technology solution helps geologists and geophysicists to research, visualize and interpret large volumes of geological data.
Our project is stable, long-term and constantly adopts new technologies such as Java 11, Cloud and GPU computing.
Work supposes close cooperation with Customer team located in Houston and following Agile principles.
Our team is senior, supportive and friendly.

Responsibilities

Learn technologies used on the project;

Explore existing code base;

Start performing project tasks.

Skills

Must have

Strong Java Core;

Algorithms: sorting, optimization;

Intermediate English.

Nice to have

Experience in desktop applications development using Java.

Git repository link of candidate's work would be helpful.

The project focuses on developing advanced software solutions for the oil and gas industry, supporting key stages of the reservoir lifecycle, including exploration, development, production, operations, maintenance, and abandonment.

The successful candidate will join the Information Management and Platform Technologies Development team and contribute to the design and development of next-generation software products. The role offers an opportunity to work with modern technologies, apply innovative ideas, and build solutions used in complex energy industry environments.

• Responsibilities:

  Key Responsibilities/Accountabilities:
  - Knowledge of software engineering best practices (including requirements analysis, system design, modularity, version control, testing, documentation, etc.) for productivity, collaboration, quality, and maintainability.
  - Knowledge of how a component fits into a larger ecosystem of products and services.
  - Understanding of how these different pieces work together, and communicate with them (using library calls, REST APIs, database queries, etc.)
  - Know how to build appropriate interfaces for components that others will depend on. Knowledge of basic system design patterns to avoid bottlenecks and let your algorithms scale well with increasing volumes of data.
  - Perform research and development tasks.
  - Expected to design, code, test, do troubleshooting and document engineering systems applications by following the software development lifecycle.
  - Accomplishes engineering and organization mission by completing related results as needed.
  - Updates job knowledge by studying state-of-the-art development tools, programming techniques, and computing equipment; participating in educational opportunities; reading professional publications; participating in professional organizations.

• Mandatory Skills Description:

  - Degree in Computer Science, Engineering, or equivalent. Master's preferred
  - Software Development Fundamentals
  - Strong understanding of Object-Oriented Design and Principles
  - 5+ years of professional experience with Java and Angular
  - Build & CI/CD: Git Ci/CD, Helm
  - Database background: Posgtess
  - REST API Express
  - Hapi
  - Self-motivated
  - Problem Solving skills
  - Works well within a team
  - Excellent communication skills

Domain: Banking & Finance
Experience: 5+ years
Project Duration: August, 2026 – November, 2026(to be extended))
Format: Hybrid
Location: Kraków, Poland

About the Project

We are looking for a Java Developer with React experience to join a team developing and supporting modern, production-grade applications within the banking and finance domain.

The role combines backend development with Java, frontend development with React, API integration, and database technologies. The selected specialist will contribute to system design, application improvements, automation initiatives, and the delivery of scalable and reliable technical solutions.

Responsibilities

• Contribute to software architecture and system design initiatives
• Lead UI enhancements and improvements to strengthen user experience and application reliability
• Develop solutions in line with established design patterns and engineering best practices
• Analyze business and technical requirements and recommend effective, scalable solutions
• Create clear, detailed, and maintainable technical documentation for applications and services
• Build prototypes and proof-of-concepts to validate technical ideas, designs, and approaches
• Manage application and infrastructure changes throughout the service management lifecycle
• Drive automation initiatives and continuous improvements across service management processes
• Provide timely customer support by troubleshooting and resolving technical issues
• Collaborate closely with customers and stakeholders to understand requirements and deliver suitable technical solutions

Requirements

• 5+ years of hands-on experience developing production-grade applications within the Java ecosystem, including frontend development with React
• Strong expertise in Java development and Web API implementation
• Experience building scalable, secure, and high-performance backend systems
• Strong troubleshooting and problem-solving skills, particularly in fast-paced or high-pressure production environments
• Solid database design and SQL expertise, especially with SQL Server
• Advanced experience with T-SQL scripting, query optimization, and performance tuning
• Practical experience with DevOps practices, including CI/CD
• Strong understanding of the full Software Development Life Cycle (SDLC), including requirements analysis, system design, development, testing, deployment, and maintenance
• Excellent analytical skills, attention to detail, and the ability to solve complex technical challenges
• Strong communication and collaboration skills across technical and non-technical teams
• Fluent English

Tech Stack

• Java
• React
• Web APIs
• API Governance & Integration
• SQL Server
• SQL / T-SQL
• PL/SQL
• DevOps
• CI/CD
• SDLC

Location

• Hybrid from Kraków, Poland
• Important: the client requires office visits in Kraków 8 times per month

Ajax Systems, an international tech company and the largest manufacturer of security systems in Europe.

We’re looking for Java Developer to join us and continue the evolution of a product that we love. The team focuses on the B2B segment at Ajax Systems. It develops software solutions for business partners, supports applications for monitoring and installation companies, and develops a tablet application for rapid response teams.

Required skills:

• 8+ years of commercial experience in backend development with Java in an enterprise environment.
• Strong understanding of Java Concurrency and hands-on experience with concurrent programming in production systems.
• Solid understanding of SOA, microservices and event-driven architecture.
• Practical experience with cloud computing platforms.
• Experience building and supporting high-load, scalable and highly available systems;
• Hands-on experience with messaging brokers.
• Strong understanding of modern backend infrastructure, NoSQL, key-value databases and in-memory storage solutions.
• Practical experience with Kubernetes.
• Experience with Git, Gradle or othet CI/CD tools.
• Strong knowledge of unit testing and automated testing approaches.

Would be a plus:

• experience with these technologies: Redis, Netty, Akka, NATS, AWS, Kafka, MongoDB, gRPC.
• Practical experience with Kotlin.
• Desire to grow into a team leadership role.

What you will do:

• design and develop core backend services and data pipelines for the product line.
• Build clean, maintainable, and production-ready code with a strong focus on quality.
• Contribute to backend architecture, drive technical decisions and document solutions for reliable deployment and operations.
• Ensure proper test coverage with unit and integration tests.
• Take ownership of performance, scalability and cost efficiency within your domain.
• Maintain production reliability through monitoring, alerting, dashboards, and runbooks.
• Investigate and resolve production issues, including deep-dive analysis of complex cases.
• Work in a strong engineering culture with testing, continuous delivery and DevOps practices.
• Collaborate closely with product and engineering teams to deliver new features and improve existing services.

Why this role is interesting:

• opportunity to work on high-load backend systems and distributed architecture.
• Real impact on core product development and architectural decisions.
• Modern technology stack and engineering-driven environment.
• Challenging tasks where performance, reliability and scalability truly matter.

We offer:

•  the opportunity to suggest and implement your own ideas that directly influence the product and its mass production.
• A place in a fast-growing company with a motivated and professional team.
• Medical insurance.
• Corporate English classes.
• The opportunity to participate in Ajax’s internal beta-testing program for security systems.
• Discounts from partner companies and on Ajax products.

Ajax Systems is a Ukrainian success story that has grown into a global product. Ajax devices are trusted by more than 4.5 million end users and 330,000 PRO users in over 180 countries. The company provides comprehensive solutions to protect residential and commercial properties of all sizes. Today, Ajax portfolio includes 280 devices for intrusion protection, video surveillance, fire safety, and comfort and automation.

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