Jobs Java

We are developing a platform that receives securities and price data from multiple providers, enriches and validates it, and distributes the consolidated data to internal bank systems. Our team manages various web and desktop applications, web services, and Linux environments that enable visualization of securities and execution of related workflows.

Our components are built using Java 8-11, JavaScript/TypeScript, Oracle, and Spring 4-5, including Spring Boot.

Responsibilities:
- Develop back-end systems using Java with well-tested code.
- Support the development environment, primarily through automation using Jenkins CI and Bash.
- Evaluate and implement new development tools, libraries, and methodologies to enhance quality.
- Conduct peer code reviews for changes in the project codebase.
- Collaborate effectively with a global team across multiple time zones, demonstrating strong verbal and written communication skills.
- Provide constructive suggestions and alternative solutions to team members to identify the most efficient and optimized approaches.

Mandatory Skills Description:
The role requires extensive expertise 10+ years in Java SE and Java EE with over a decade of professional experience, emphasizing strong proficiency in the Spring framework, including Boot, IoC, MVC, AOP, Security, Data, JDBC, and testing components. The candidate must be skilled in SQL and relational databases, specifically Oracle, and have a solid understanding of Servlets, servlet containers such as Tomcat, and application servers like Weblogic. Familiarity with CI/CD processes and tools, notably TeamCity and Jenkins, is also essential.

Hard skills include:
- Advanced Java SE and Java EE development
- Comprehensive Spring framework application
- SQL query writing and database management using Oracle
- Knowledge of Servlets, Tomcat, and Weblogic server environments
- Experience with CI/CD pipelines using TeamCity and Jenkins
- Practical Linux system navigation, file and permission management, user and group administration, process and service handling, security keys and certificates, and basic Bash scripting

Soft skills focus on:
- Analytical problem-solving to identify and implement effective, maintainable solutions
- Collaborative discussion and consensus-building within the team to select optimal approaches

Nice-to-Have Skills Description:
- Proficiency in Angular or similar frameworks (React, Vue), including Angular Material and RxJs, demonstrating capability in modern front-end development.
- Ability to design and implement visually appealing and functional HTML/CSS layouts.
- Strong expertise in Oracle database management and operations.
- Familiarity with ELK stack for logging, monitoring, and data analysis.
- Experience working with Spring Cloud modules and developing microservice architectures.

Languages:
English: B2 Upper Intermediate

We’re looking for a Backend Engineer to join an engineering team building AI-driven products at global scale.

You’ll work closely with engineers, product managers, designers, and AI specialists to build scalable backend systems and deliver high-impact product features.

You’ll help build systems that support students throughout their writing journey — from drafting and citations to AI transparency, authorship, and plagiarism detection.

This role combines backend engineering, distributed systems, and applied AI. You’ll work hands-on with AI-powered features while building the reliable infrastructure required to support them at scale.

What You’ll Do

• Build and ship end-to-end features across high-scale backend services.
• Design, develop, and maintain scalable APIs and distributed services.
• Build and integrate AI-powered capabilities into product workflows.
• Work with LLM-based systems, AI APIs, and intelligent backend services.
• Design and operate WebSocket-based real-time systems at scale.
• Improve system performance, reliability, scalability, and architecture.
• Diagnose and resolve complex production issues.
• Collaborate with product, design, and AI teams to deliver high-impact solutions.
• Contribute to technical architecture, engineering standards, and system design decisions.
• Mentor engineers and contribute to the growth of the engineering team.

What You’ll Work On

• AI-powered writing and productivity products.
• AI transparency and authorship systems.
• Citation and attribution workflows.
• Plagiarism and AI-generated content detection.
• Integrations with educational platforms and third-party tools.
• High-scale backend infrastructure supporting global users.

Requirements

• 5+ years of professional backend engineering experience.
• Strong hands-on experience with Java and Spring Boot.
• Experience designing and scaling production systems.
• Strong knowledge of REST APIs, GraphQL, microservices, and message brokers such as Kafka or RabbitMQ.
• Experience with Python.
• Strong foundations in algorithms, data structures, and system design.
• Experience building or integrating AI-powered features, including LLMs, AI APIs, or similar technologies.
• Hands-on experience designing and operating WebSocket-based real-time systems at scale.
• Experience working with high-load production systems, including services supporting 100,000+ users or significant request-per-second volumes.
• Strong debugging and problem-solving skills, with the ability to troubleshoot complex distributed systems.
• Experience collaborating across engineering, product, design, and AI teams.
• Strong product mindset and attention to user experience.
• Experience mentoring engineers or contributing to technical leadership.

Nice to Have

• Experience working with LLMs and AI frameworks such as OpenAI, Anthropic, LangChain, or LangGraph.
• Experience building AI-native products or integrating generative AI into production systems.
• Background working on high-scale or globally distributed applications.
• Experience with cloud infrastructure, observability, and production reliability.
• Previous experience in technical leadership or mentoring.

Work Authorization

Candidates must be legally authorized to work in the United States at the time of hire. We are unable to provide visa sponsorship for this role.

Contract-to-Full-Time Opportunity

Contractor Phase

• Hourly contract engagement.
• Initial contract duration of 6–12 months.
• Opportunity to transition to a full-time position based on performance, business needs, and mutual fit.

Potential Full-Time Benefits

Upon successful transition to a full-time role, the position may include:

• Comprehensive health benefits, including medical, dental, vision, and mental health coverage.
• Paid time off and company holidays.
• Parental leave.
• 401(k) or other retirement options, where applicable.
• Professional development support.
• Wellness and home-office stipends.
• Additional benefits available to full-time employees.

We are looking for a Full-Stack Software Engineer with 3+ years of commercial experience to help maintain and modernize a large-scale software platform.

Requirements:

• 3+ years of experience in full-stack software development.
• Strong proficiency in Java and Spring Boot.
• Experience with React.js and/or Next.js.
• Hands-on experience with SQL and RESTful APIs.
• Experience with Grails and/or MongoDB is a plus.
• Experience with software engineering best practices, including code reviews, testing, source control, and CI/CD workflows.
• Comfortable working across the full stack, handling both backend services and front-end/UI changes independently
• Experience using AI-assisted coding tools (e.g., Claude Code or similar).
• Experience with dependency management and monitoring tools is a plus.
• Strong understanding of object-oriented programming principles.
• Excellent communication and collaboration skills.

• Experience working in an Agile environment.

   

Key Responsibilities

• Own routine platform maintenance, ensuring systems remain secure, stable, and up to date.
• Review, test, and implement dependency and library updates.
• Perform third-party service upgrades and validate integrations after releases.
• Investigate and resolve production issues identified through monitoring tools.
• Monitor releases to detect regressions and maintain platform stability.
• Contribute to long-term modernization initiatives, including framework migrations and technical debt reduction.
• Develop clean, efficient, and maintainable code across both backend and frontend.
• Participate in code reviews to ensure high code quality and adherence to engineering best practices.
• Troubleshoot, optimize, and resolve complex software issues.
• Collaborate with distributed team members across time zones and maintain clear technical documentation.

About Us

Peratera is a UK-based fintech company, founded in 2022 and authorised by the FCA as an Electronic Money Institution. We are building a modern, all-in-one payment platform that enables businesses to manage global payments and financial operations seamlessly.

Our solution allows companies to open multi-currency accounts, send and receive payments worldwide, and manage cross-border transactions from a single platform. Our mission is to simplify global finance and remove friction from international business operations.

Your Mission 

As a Lead Java Engineer, you will be a technical anchor for our distributed financial platform - leading the design and delivery of critical platform services, setting the engineering bar for the team, and ensuring that architectural decisions are translated into clean, reliable and maintainable code. Working closely with our Architect, CTO, and Product teams, you will own not the architecture itself, but how it gets built - being the person the team looks to for technical guidance, code quality, and engineering standards.

Your Tech Environment
You will work in a modern, cloud-native stack with clear ownership and no legacy surprises:

• Backend: Java 17+, Spring Boot (Core, Security, Data, Cloud), REST APIs, event-driven services, Camunda
• Infrastructure: AWS (EKS, RDS, CloudWatch), Docker, Kubernetes, GitLab CI/CD
• Data & Messaging: PostgreSQL, AMQP / Kafka-style message brokers, event-driven architecture
• Observability: OpenSearch / ELK, Prometheus / Micrometer, OpenTelemetry (in progress)

• Integrations: Open Banking providers, banking partners, external payment systems

   

What You’ll Do 

• Lead the design and implementation of core platform services: payment flows, transaction lifecycle, reconciliation, and wallet infrastructure
• Participate in architecture discussions, and ensure implementation aligns with the architectural direction
• Set and enforce engineering standards: code quality, testing strategy, observability, and delivery practices across the team
• Mentor and grow a team through code review, pairing, and technical guidance
• Translate architectural decisions into clear, implementable technical solutions for the team
• Partner with Product and DevOps to drive end-to-end delivery of complex financial features
• Drive platform reliability, fault tolerance, and performance at scale
• Contribute to the platform's evolution toward AI-assisted and data-driven capabilities

What We’re Looking For

• 8+ years of strong, production Java experience
• Proven track record in a tech lead or lead engineer role
• Deep expertise in the Spring Boot ecosystem and distributed systems at scale
• Hands-on experience building financial systems: payments, wallets, banking or fintech
• Strong engineering leadership: code review culture, mentoring, standards definition
• Strong REST API design skills and hands-on experience with messaging systems
• Solid SQL skills; PostgreSQL experience preferred
• Familiarity with cloud environments, CI/CD pipelines, and observability tooling

• Comfortable working asynchronously in a distributed, international team

   

Nice to Have

• Background in a licensed financial institution (EMI, payment institution, or bank)
• Familiarity with PCI DSS requirements and regulated payment environments
• Exposure to Open Banking providers or scheme integrations (Visa / Mastercard)
• Hands-on work with Camunda or other workflow orchestration engines
• Background in event-sourcing or CQRS patterns

• Interest or practice in AI / ML applied to financial systems

   

What You’ll Get

• Competitive, market-aligned compensation - discussed openly at first interview
• Direct impact on architecture and strategic platform decisions from day one
• A real fintech platform running at production scale - not a demo environment
• Exposure to modern cloud-native, AI-assisted, and Open Banking systems

• Fully remote setup with flexible hours and an international, highly skilled team

   

Sounds like a match? Send us your CV - we’re excited to get to know you.

About the Project

AI Interview Platform (client name undisclosed) — a leading technical interviewing platform used by fast-growing startups and large enterprises worldwide. It pairs experienced engineers with standardized interview frameworks to enable fair, high-signal, and scalable hiring for software engineers globally.

What You'll Do

• Conduct live technical interviews with software engineering candidates worldwide via the platform.
• Assess coding skills, problem-solving abilities, technical knowledge, and communication while creating a professional and inclusive candidate experience.
• Provide structured, objective feedback based on established evaluation criteria to reduce bias and improve hiring quality.
• Collaborate with the client’s team to test, refine, and improve interview content, processes, and platform features.

Must Have

• 4+ years of professional experience as a Software Engineer/Developer.
• Strong Java proficiency + working knowledge of frontend technologies (JavaScript, React, or similar).
• Solid understanding of algorithms, data structures, and software engineering fundamentals.
• Excellent English communication skills (spoken and written).
• Professional demeanor, ability to deliver objective assessments, and reliable setup (webcam, microphone, stable internet).

Nice to Have

• Prior experience conducting technical interviews (DS&A, system design).
• Mentoring, coaching, or technical leadership experience.
• Interest in talent assessment, interviewing best practices, or inclusive hiring.

Location: EU / Remote (Ukraine)

Type: Freelance full-time (first 3 months), with option to go part-time later.

• 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

S* S* Inc

S* S* Science Inc is a U.S.-based fintech company operating in the investment and financial services space. Our distributed teams work across Poland, the United States, and Ireland, collaborating on technology-driven solutions related to stocks and investments.

Security, compliance, and the responsible handling of sensitive financial data are central to how we operate as we build scalable products in a regulated environment.

Project

The engineer will initially get familiar with the product, domain, and existing codebase by working on current issues and fixes. After onboarding, the role will gradually expand into the development of new change requests and product enhancements.

The project is focused on backend development within a complex fintech environment involving distributed systems, microservices, event-driven architecture, cloud technologies, and data-intensive applications.

Requirements

We are looking for an experienced backend engineer with strong hands-on experience in:

• Core Java and Spring
• Server-side development
• SQL
• Microservices
• REST APIs
• Kafka and event-driven architectures
• Python
• Kubernetes
• GitHub
• Redis and caching
• Azure
• Snowflake
• PostgreSQL
• Cloud-native development
• CI/CD
• Distributed systems
• Concurrency
• Multi-tenancy
• Data governance

Experience with modern LLM and agentic technologies is highly valuable, including:

• Prompt engineering
• Model Context Protocol (MCP)
• Retrieval-Augmented Generation (RAG)
• LLM/agentic development

Engagement Details

Initial contract duration: 1 year, with the possibility of extension based on performance and skill set
Hourly remuneration: $32.5 USD/hour for a Middle engineer – 35 USD/hour  for a Senior Engineer 
Engagement: Full-time
Location / time zone: Poland
Working language: English
Working hours: Standard Polish working hours, with at least 4 hours of overlap with U.S. Eastern Time

Recruitment Process

The recruitment process follows our standard interview stages, including technical and client-side evaluation.

Important — Please Read Before Applying

The client is building a product in the banking, investment, and brokerage systems domain. Due to strict investor, security, and compliance requirements, every candidate must successfully complete a background check.

For this reason, candidates must:

• be currently based in Poland;
• have been a taxpayer in Poland for at least 2 years;
• be able to provide the required documentation for the background-check process.

We are looking for someone who can quickly understand an existing system, resolve complex backend issues, and gradually take ownership of new development in a security-sensitive fintech environment.

A next-generation cross-asset data management platform to provide globally consistent data and innovative tools to support business strategy for trade/sales clients, which is built on big data architecture, highly scalable, and cloud-ready. The platform enables industry-leading analytics, client reporting, regulatory compliance, surveillance, supervisory reporting, and data science solutions (data flame). The project tech stack: Java, Scala, Spring, SQL, Kafka, Hadoop.

We are looking for a strong Senior Java Developer capable of being able to work within the team, being a mentor for team members, communicating with stakeholders, and being accountable for the outcomes of activities that are assigned.

The role of the involves working with strong development teams (2 Senior Java Developers), the opportunity to work with big data, improving knowledge in this domain, and utilizing the resources of an international bank.

Responsibilities

Design and build frameworks for ingesting/modeling the complex Risk data

Develop Low latency caching to service Front office risk systems

Setup monitoring and management for services

Provide SME support for development of automated QA scripts

Skills

Must have

Strong knowledge of Big Data technologies: Hadoop Ecosystem (HDFS, Impala, HIVE, HBASE, etc.) and Apache Spark. Green flags: Spark, Hive, Hadoop.

At least 5 years of experience in software development, including professional backend software development experience;

Strong Knowledge of Java programming languages

Should be familiar with algorithms and design patterns

Familiarity with Linux environment, including scripting skills

Designing and building APIs (Java);

Java Server-side or Back-end development;

Core Java;

Java collections and multithreading;

Java Memory Management;

Database and SQL (writing stored procedures, designing table schemas).

Understanding of distributed systems.

Understanding of CI/CD workflow.

Ability to multi-task and work under pressure.

Ability to pick up new concepts and apply the knowledge.

Demonstrated problem-solving skills.

Enthusiastic and proactive approach with a willingness to learn.

The candidate is expected to be dynamic and flexible with a high energy level as this is a demanding and rapidly changing environment

Nice to have

Experience In-memory databases and caching

Job Orchestration tools like Autosys or Airflow

Apache Spark

Financial background (where possible)

Job Description

- 2+ years of Java developing and boostering automated QA systems and associated test strategies.
- Experience working with business-critical customer-facing applications (user interfaces, APIs and back-end services).
- Excellent communication skills with emphasis on writing detail-oriented documents and communications.
- Strong understanding of object-oriented programming concepts.
- Strong understanding of web UI/API and services automation testing (Selenium WebDriver/Selenide, RestAssured).
- Experience using BDD approach
- Experience working with a Linux-based laptop
- Experience with continuous integration tools, such as Jenkins.
- Shifted working hours 12pm till 8pm EEST timezone (nice to have)

Nice to have:

- Experience with the Ad Tech industry.
- Familiarity with clustered computing, distributed and parallel computing concepts.

Job Responsibilities

- Be a creative problem-solver who can draw on an array of expertise and technology to design and implement reliable, scalable and maintainable solutions to challenging problems
- Write production-ready code and unit tests that meet both system and business requirements (Java)
- Respond to feature requests, bug reports, performance issues and ad-hoc questions
- Work collaboratively with multiple teams to deliver quality software
- Support operation of services in production
- Perform code reviews and design reviews

Department/Project Description

Founded in 2007, Magnite’s pioneering technology created a new model for the advertising industry. Today, our automated advertising platform is used by the world’s leading publishers and applications to transact with top brands around the globe enabling them to reach more than 1 billion consumers. Magnite operates the largest independent Display Advertising Exchange and Supply Side Platform that automates the buying and selling of Display Advertising across all formats (banner, video) on all devices (desktop browsers, mobile devices, billboards). Magnite auctions over 20 Billion Ads on a daily basis in real time in less than 1/2 of a second each. Magnite is a publicly traded company (NYSE: RUBI) headquartered in Los Angeles, California, USA.

Workload: full-time, remote
Start: asap
Duration: long-term
Location: any
English: B2

Technical requirements (general)
- 3+ years of production blockchain experience in BTC. Multi-protocol experience (strongly preferred).
- Java + Spring Boot + SQL
- Familiarity with test-driven development (TDD) and/or behaviour-driven development (BDD) as working practices, writing tests before or alongside implementation.
- Familiarity with Domain-Driven Design principles.
- Comfortable working in a monorepo structure with shared libraries, cross-squad code visibility, and coordinated CI/CD pipelines.
- Proactive communication, raising blockers, design concerns, and cross-squad dependencies.
- Written and verbal communication in English must be at a professional level.

Technical requirements (specific)
- Deep Bitcoin protocol expertise: PSBT format (BIP-174 and subsequent updates), UTXO management and coin selection algorithms, SegWit transaction structures, script types and descriptor formats (Taproot out of scope).
- Multi-signature coordination: BIP-48 (multi-sig derivation paths), BIP-67 (lexicographic key sorting), P2WSH script construction, PSBT combination and finalisation workflows.
- Fee estimation: Mempool analysis, RBF (Replace-By-Fee) and CPFP (Child-Pays-For-Parent) fee bumping strategies, fee rate prediction.
- Transaction construction: Witness data assembly, BIP-143 (SegWit sighash), DER signature encoding, low-S enforcement. Familiarity with sighash types. SIGHASH_ALL is the production default for custody; engineers should understand the full sighash taxonomy for validation and edge-case handling but implementation focuses on SIGHASH_ALL.
- Transaction lifecycle and remediation: Stuck transaction detection via mempool monitoring, RBF and CPFP execution for fee bumping, handling transactions that remain unconfirmed for extended periods, and managing the operational decision of when to replace vs wait.
- UTXO indexing and balance management: Experience with UTXO set tracking, balance computation from unspent outputs, UTXO consolidation strategies during low-fee windows, and address-level balance monitoring for deposit detection.
- Address management: Gap limit handling for HD wallets, change address allocation from internal derivation branch (m/84'/0'/0'/1/*), address reuse prevention, and descriptor-based address discovery for wallet import and recovery scenarios.
- Chain semantics and failure modes: Understanding of Bitcoin's probabilistic finality (confirmation depth vs settlement assurance), dust output limits and their implications for UTXO management, fee spike behaviour during congestion events (e.g. ordinals, inscription surges filling blocks for extended periods), double-spend detection for unconfirmed transactions, and the operational difference between a transaction that is "broadcast" vs "in mempool" vs "confirmed at depth N." Engineers must understand that Bitcoin has no concept of a "failed" transaction that consumes fees; a transaction either confirms or it doesn't, and unconfirmed transactions can be replaced or may eventually confirm unexpectedly.
- Production experience: Operating Bitcoin custody or wallet infrastructure at institutional scale, not testnet-only or personal wallet experience.

Candidate's responsibilities
Bitcoin wallet management, UTXO handling, transaction construction (PSBT, SegWit), multi-signature coordination, fee estimation.

About Flamingo

Flamingo is revolutionizing the Managed Service Provider (MSP) industry with an AI-driven, open-source platform for IT and security. Our goal is to empower MSPs with automation, optimization, and scalability tools to enhance their operations. 

Role Overview

As a Senior Back-end Engineer (Java) at Flamingo, you will design and develop scalable, high-performance back-end services and APIs using Java and Spring Boot. You will be responsible for implementing event-driven microservices, optimizing system performance, and ensuring high availability as we scale our platform. Your expertise in processing high-volume logs and integrating multiple data sources will be critical to building a robust and efficient system.

Key Responsibilities

• Design and develop scalable backend services and APIs using Java (Spring Boot).
• Architect and implement event-driven microservices with Kafka and RabbitMQ.
• Process and analyze high-volume logs efficiently to ensure scalability and real-time insights.
• Integrate and manage multiple data sources, including SQL, NoSQL, and streaming data.
• Optimize database performance using PostgreSQL, Redis, and Elasticsearch.
• Implement authentication and authorization mechanisms with OAuth, JWT, and Keycloak.
• Collaborate with front-end and DevOps teams to build a seamless and resilient system.
• Ensure code quality through automated testing, CI/CD pipelines, and best engineering practices.

Qualifications

Must-Have:

• 5+ years of experience in backend development with Java and Spring Boot.
• Experience in microservices architecture, including event-driven systems (Kafka, RabbitMQ).
• Strong knowledge of RESTful APIs, GraphQL, and WebSockets.
• Experience processing high-volume logs and working with log management tools (ELK stack, Loki, Fluentd, OpenTelemetry).
• Experience working with multiple data sources, including relational (PostgreSQL) and non-relational (Redis, Elasticsearch) databases
• Experience with containerization (Docker, Kubernetes) and cloud platforms (AWS/GCP).
• Understanding of security best practices in backend development.

Nice-to-Have:

• Experience with functional programming in Java or Scala.
• Familiarity with distributed tracing (e.g., Jaeger, Zipkin) for microservices.
• Knowledge of cloud-native architectures and serverless frameworks.
• Exposure to message queues and event sourcing.

Why Join Flamingo?

• High-impact role: As a back-end engineer, your contributions will directly shape Flamingo’s product and technology.
• Innovative Tech Stack: Work with cutting-edge open-source technologies in AI, automation, and security.
• Remote-first Culture: Flexibility to work from anywhere while collaborating with a top-tier team.
• Mission-Driven Company: Join a team passionate about disrupting the MSP industry and making enterprise-grade security and IT automation accessible to all.

🚀 AIMPROSOFT is looking for a Full-Stack Java Developer (ReactJS/Spring Boot)! 

Aimprosoft, a fast-growing IT company, is looking for a Full-Stack Java Developer (ReactJS/Spring Boot) on a contract basis (≈ 2+ months) for an international Telecom project. 

This is a hands-on backend role focused on building a Service Integration Layer for a UK broadband and telecom wholesale operator. The platform will orchestrate VOIP and hardware service fulfilment between the client’s commercial order management system and downstream suppliers. 

You will join the project at the MVP stage and contribute to an intensive 8-week Phase 0 proof of capability. The role is a strong fit for an engineer who is comfortable working with backend integrations, long-running workflows, AWS services, and evolving technical specifications. 

🎯 About the project & role: 

The Service Integration Layer will manage complex order journeys across the client’s wholesale carrier ecosystem. Its responsibilities include service qualification, VOIP ordering, supplier orchestration, inventory updates, status tracking, and reliable recovery of interrupted processes. 

You will: 

• Implement Service Qualification and Service Order APIs using Java and Spring Boot  
• Build an adapter for integration with an external VOIP and hardware supplier  
• Implement six supplier operations covering customer, subscription, user, and phone-number provisioning  
• Embed and configure a workflow engine such as Camunda, Flowable, jBPM, or a similar solution  
• Implement long-running workflows with timers, persisted state, retries, compensation, and recovery  
• Ensure reliable asynchronous processing through idempotency, correlation IDs, timeouts, and error handling  
• Build mocks and stubs for external systems to keep development independent of third-party sandbox availability  
• Implement a minimum read-only Service Inventory and catalogue configuration  
• Produce OpenAPI documentation and maintain a clear variance log for differences between the specification and implemented contracts  
• Demonstrate durable order persistence and clean workflow recovery after an intentional mid-process restart  
• Collaborate with the Architect, QA, DevOps, and Project Manager throughout implementation  

All development will take place inside the client’s AWS account, repositories, and CI/CD environment.  

🔥 What We Need From You: 

• 5+ years of commercial Java development experience  
• Strong hands-on experience with Spring Boot 
• Commercial experience with ReactJS and the ability to develop and maintain frontend components integrated with Java/Spring Boot APIs 
• Upper-Intermediate+ (B2+) English level 
• Experience building REST APIs and integration-heavy backend services  
• Solid understanding of REST and JSON API design and consumption 
• Experience integrating with at least one non-trivial third-party API  
• Practical knowledge of retry strategies, timeout handling, error processing, and idempotency  
• Experience with long-running or stateful business processes using workflow engines, sagas, or state machines  
• Understanding of asynchronous and event-driven integration patterns  
• Experience with microservice architecture  
• Familiarity with OAuth2-secured APIs  
• Practical AWS experience, particularly with services such as API Gateway, ECS/Fargate, Lambda, AWS OpenSearch, RDS, SQS, or EventBridge. 
• Basic understanding of infrastructure managed with Terraform  
• Ability to work effectively with evolving specifications, identify ambiguities, and raise them as tracked risks  

• Ability to deliver in a fast-paced, fixed-deadline environment  

   

📌 Nice to have: 

• Experience with TM Forum Open APIs  
• Background in telecom OSS/BSS integrations 
• Hands-on experience with Camunda 8 SaaS, Flowable, jBPM, or another BPM/workflow engine  
• Experience embedding or operating a workflow engine as part of a Java application  
• Understanding of process definitions, timers, compensation, and workflow state persistence  
• Understanding of telecom order lifecycle, service qualification, inventory, or provisioning processes  
• Experience with transactional outbox, idempotent consumers, correlation IDs, and recovery patterns  
• Experience working with Apache Kafka or RabbitMQ  
• Knowledge of AWS Secrets Manager  
• Experience working on fixed-scope or fixed-deadline delivery projects  
• Experience producing OpenAPI documentation and supporting Postman-based integration testing  
• Bachelor’s or Master’s degree in Computer Science or a related field  

💼 What We Offer: 

• Official military deferment (reservation); 
• A competitive salary that appreciates your skills and experience; 
• Opportunity to join a strategically important pilot team with long-term project prospects 
• Work on modern cloud-native products that deliver real-world impact 
• Exposure to AI-powered development practices and enterprise-scale engineering 
• Open environment where your ideas, technical expertise are valued 

PLEASE NOTE that we are searching for candidates who are located in Lviv and are able to visit office in Lviv.

About us:

EveryMatrix is a leading B2B SaaS provider delivering iGaming software, content and services. We provide casino, sports betting, platform and payments, and affiliate management to 200 customers worldwide.

But that's not all! We're not just about numbers, we're about people. With a team of over 1000 passionate individuals spread across twelve countries in Europe, Asia, and the US, we're all united by our love for innovation and teamwork.

EveryMatrix is a member of the World Lottery Association (WLA) and European Lotteries Association. In September 2023 it became the first iGaming supplier to receive WLA Safer Gambling Certification. EveryMatrix is proud of its commitment to safer gambling and player protection whilst producing market leading gaming solutions.

Join us on this exciting journey as we continue to redefine the iGaming landscape, one groundbreaking solution at a time.

We are looking for a passionate and dedicated Strong Junior Java Developer to join our team in Lviv!

About the job:
It is a part of EveryMatrix platform that is responsible for collecting, storing, processing and utilizing hundreds of millions of transactions from the whole platform every single day. We develop Business Intelligent solutions, reports, 3rd party integrations, data streaming and other products for both external and internal use. The team consists of 35 people and is located in Lviv. We are looking for motivated, proactive developers willing to learn modern technologies, working in a challenging and fast-paced environment. You will be working in small cross-functional Agile teams responsible for the end-to-end development and component support using the You Build It, You Run It principle.

What You'll get to do:

• Extend and optimize the Rules Engine.
• Collaborate with cross-functional teams to deliver innovative solutions.
• Participate in code reviews and contribute to team knowledge sharing.
• Troubleshoot, debug, and resolve software defects and issues.
• Assist in designing and implementing new features.
• Develop unit and integration tests to ensure software quality.
• Document code, processes, and technical specifications.
• Stay up-to-date with Java best practices and emerging technologies.
• Support deployment and maintenance of applications in development and production environments.
• Participate in Agile ceremonies and contribute to sprint planning and retrospectives.

What You need to know:

• Java Core: Deep understanding of collections, performance tuning, type systems, garbage collection, and exception handling.
• Multithreading & Concurrency: Expertise in managing asynchronous computations and ensuring thread safety.
• HTTP & RESTful Services: Strong experience in developing and consuming RESTful services.
• RDBMS & SQL: Proficiency in writing complex SQL queries and a solid understanding of RDBMS theory.
• Spring Boot: Practical experience with the Spring ecosystem, including a strong theoretical foundation.
• Apache Kafka: Proven experience with Kafka, including both practical application and theoretical knowledge.
• Unit/Integration Testing: Demonstrated ability to write testable code with adequate coverage.

Nice to Have:

• Experience with Docker & Kubernetes.
• Experience with the Google Cloud platform.
• Knowledge of Online Casino/Sports Systems.

Here's what we offer:

• Start with 22 days of annual leave, with 2 additional days added each year, up to 32 days by your fifth year with us.
• 3 sick leave days per year, no doctor's note required; 30 medical leave days with medical allowance
• Hybrid work schedule is available after the first three months of employment with 80/20 office/home format until the end of 2026. Starting from 2027, the policy will transition to primarily office-based work, with up to 10 work-from-home days per year with manager approval.
• Benefit from two Free Fridays each year, limited to one per quarter.
• Daily catered lunch or monthly lunch allowance. 
• Private Medical Subscription. 
• Access online learning platforms like Udemy for Business, LinkedIn Learning or O’Reilly, and a budget for external training.
• Gym allowance.
• Corporate English lessons.
• Support for New Parents:
• 21 weeks of paid maternity leave, with the flexibility to work from home full-time until your child turns 1 year old.
• 4 weeks of paternity leave, plus the flexibility to work from home full-time until your child is 13 weeks old.

Our office perks include on-site massages and frequent team-building activities in various locations.

At EveryMatrix, we're committed to creating a supportive and inclusive workplace where you can thrive both personally and professionally. Come join us and experience the difference!

👨‍💻We invite a Junior/Middle Java or Kotlin Developer to join our team for long-term cooperation. Gransoft develop an international health insurance portal. Our project has become especially important at this time.

▪️Office Location: Uzhhorod

Requirements:

— Strong and confident knowledge of Java or Kotlin, Hibernate, Spring, MySQL

— Experience with any software development 1-5 years

— Experience with Java/Kotlin provides a significant advantage

— An intermediate-level proficiency in English: reading, writing and speaking

— Responsible attitude to the tasks and deadlines

— Work from office only

We offer:

— Interesting and challenging project

— Creative and friendly atmosphere

— Our company policy is to welcome your ideas and suggestions

— An international team of experienced Java/Kotlin developers

— Paid vacations and days off during national holidays

— Flexible work schedule

— 8-hour workday

— Office in Uzhhorod or Gdansk

— Paid English language courses

— The company provides relocation support and, if needed, assists with the moving process and finding accommodation

More details could be given during an interview.

Please include your Telegram username in CV.

👨‍💻We invite a Junior/Middle Java or Kotlin Developer to join our team for long-term cooperation. Gransoft develop an international health insurance portal. Our project has become especially important at this time.

Office Location: Uzhhorod.
Please note: This is an on-site position only!
Hybrid and remote work arrangements are not available.

Requirements:

— Strong and confident knowledge of Java or Kotlin, Hibernate, Spring, MySQL

— Experience with any software development 1-5 years

— Experience with Java/Kotlin provides a significant advantage

— An intermediate-level proficiency in English: reading, writing and speaking

— Responsible attitude to the tasks and deadlines

— Work from office only

We offer:

— Interesting and challenging project

— Creative and friendly atmosphere

— Our company policy is to welcome your ideas and suggestions

— An international team of experienced Java/Kotlin developers

— Paid vacations and days off during national holidays

— Flexible work schedule

— 8-hour workday

— Office in Uzhhorod or Gdansk

— Paid English language courses

— The company provides relocation support and, if needed, assists with the moving process and finding accommodation

More details could be given during an interview.

Please include your Telegram username in CV.