Senior Java Developer (Backend)

Senior Backend Java Developer Location: Warsaw, Poland (hybrid – 2 days/week in the office)About the Role We’re looking for a Senior Backend Java Developer to design and build scalable, high-performance backend systems for international products. You’ll work in a collaborative environment, contribute to architectural decisions, and mentor other engineers. Responsibilities • Design, develop, and maintain backend systems using Java 17+ and Spring Boot • Ensure scalability, performance, and security of solutions • Work with SQL databases (e.g. PostgreSQL) • Support deployments using Docker, Kubernetes, and Helm • Use Bash/Shell for automation and integration tasks • Lead technical discussions and mentor team members • Collaborate in Agile (Scrum) teams and communicate in English Requirements • Strong experience with Java 17+, Spring / Spring Boot / Spring Security • Experience with cloud-native applications • Maven, SQL, Git (GitHub, CI/CD) • Testing frameworks (JUnit, AssertJ, Hamcrest) • Kubernetes, Helm • Bash/Shell scripting • English B2/C1 • Experience in enterprise environments • 8+ years of backend development experience Nice to Have • PostgreSQL, Hibernate/JPA • Kafka, event-driven architecture • Microservices architecture • Python • Knowledge of C or Go • CI/CD tools, JIRA • Monitoring tools (Grafana, Prometheus, Kibana) • Security best practices (OWASP) Qualifications • Degree in Computer Science or related field