Java Developer

Java Developer 

Location: Warsaw / Hybrid (initially remote, moving to hybrid ~3 days/week on-site)

Company: US-based technology firm in private capital / financial markets

Employment Type: Full-time

About the Role

We are looking for a skilled Java Developer to join our backend engineering team. You will help build and maintain high-performance, scalable, distributed systems and APIs that handle core business workflows and data processing in a mission-critical domain. You’ll work closely with frontend engineers, product, QA, and operations to deliver robust, secure, and maintainable solutions.

Key Responsibilities

• Design, implement, and maintain server-side services and microservices in Java (Spring, Jakarta EE, etc.)

• Define and build RESTful APIs, possibly GraphQL, and other backend interfaces

• Architect and develop scalable solutions, emphasizing performance, reliability, fault tolerance, and high availability

• Integrate with databases (relational, NoSQL), message queues, and third-party services

• Participate in code reviews, technical design discussions, and architecture planning

• Write clear, maintainable, and well-tested code (unit / integration / end-to-end tests)

• Troubleshoot and resolve production issues (monitoring, logging, diagnostics)

• Optimize existing systems, refactor modules, and drive continuous improvement

• Stay current with Java ecosystem trends, frameworks, tools, and best practices

What We’re Looking For (Required)

• Strong proficiency in Java (Java 11+, or whichever version your stack uses)

• Experience with Spring Boot / Spring Cloud (or equivalent Java frameworks)

• Solid understanding of object-oriented design, design patterns, clean architecture

• Experience building RESTful APIs, and (ideally) GraphQL or event-driven APIs

• Familiarity with relational databases (PostgreSQL, MySQL, Oracle) and/or NoSQL (e.g. MongoDB, Redis)

• Experience with message queues / streaming systems (e.g. Kafka, RabbitMQ)

• Experience with unit testing, integration testing frameworks (JUnit, Mockito, etc.)

• Working knowledge of CI/CD pipelines, version control (Git), and DevOps practices

• Strong debugging skills, performance tuning, and production issue analysis

• Ability to work in an Agile / Scrum environment

Nice to Have (Preferred / Bonus)

• Experience in microservices architecture, domain-driven design, event sourcing, CQRS

• Familiarity with cloud platforms (AWS, Azure, GCP) — e.g., deploying Java services, serverless, containers (Docker, Kubernetes)

• Experience with other JVM languages (Kotlin, Scala)

• Exposure to GraphQL, gRPC, or WebSockets

• Knowledge of security standards, OAuth2 / OpenID Connect, JWT

• Experience in the financial / capital markets / fintech domain

• Experience with distributed caching, caching strategies

• Experience with observability tooling (Prometheus, Grafana, ELK / EFK stack)

Qualifications / Experience

• Bachelor’s or Master’s degree in Computer Science, Software Engineering, or related technical discipline

• 4+ years (or adjust accordingly) of professional experience in backend development with Java

• Demonstrated track record of designing and delivering reliable backend systems

What We Offer

• Competitive salary up to 6 500 USD

• Remote start, transitioning to hybrid (Warsaw)

• Full benefits package

• Generous paid time off

• Opportunity to work on impactful, financial / capital market systems

• Collaborative, innovative, and tech-driven culture

• Learning opportunities, conferences, trainings, etc.