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April 24, 2026

Full Stack Developer (Java)

Mid • Hybrid

28,000 - 35,000 PLN/mo

Warsaw, Poland

For our Client we are looking for a Full Stack Java Developer.

Warsaw, hybrid (4 days per week from the office)

B2B: 28,000–35,000 PLN per month

Key Responsibilities

  • Gather and analyse requirements with business stakeholders

  • Design, plan, implement and test changes with the engineering team

  • Adapt and enhance legacy Java applications for ISO 20022 changes

  • Develop and maintain backend services and integrations

  • Participate in code reviews, UAT support and production releases

  • Continuously improve code quality and system design

Requirements

  • 4+ years of experience as a Java / Full Stack Developer

  • Strong hands-on experience with: Java, Spring, Spring Boot (DI, Spring Data, Spring Security)

  • Hibernate, DB2

  • Apache Kafka (producers, consumers, Kafka Streams, Kafka Connect)

  • MongoDB (document modelling, Spring Data MongoDB)

  • RESTful APIs, microservices, event‑driven architectures

  • Maven (multi-module builds)

  • Docker

  • Git & CI/CD (GitLab CI preferred)

  • Experience working in distributed systems and complex legacy codebases

  • Strong analytical skills and ability to understand complex business logic

  • Good communication skills and ability to work in a global team