Senior Java Developer

Senior Java Developer – Software Development Team
Empower innovative software solutions — shape the future of Java development!
Warszawa-based opportunity with hybrid work model (up to 4 remote days per week)
As a Java Tech Lead within our client's software development team, you will be working for a leading industry innovator delivering mission-critical enterprise applications. You will combine hands-on backend development with technical leadership, driving architectural decisions, mentoring developers, and ensuring engineering excellence across multiple applications. Working closely with stakeholders and Agile teams, you will remove delivery blockers, define technical direction, and build secure, scalable Java solutions that support long-term business growth and operational efficiency.
– Lead technical solution discussions with business and engineering stakeholders
– Define technical direction and critical delivery paths for development initiatives
– Mentor developers and support the team's technical growth
– Ensure high-quality, secure and maintainable software aligned with engineering best practices
– Develop and maintain backend applications using Java and Spring Boot
– Perform code reviews and drive continuous code quality improvements
– Participate in technical analysis, architecture discussions and solution design
– Remove technical blockers and support efficient delivery across the development pipeline
– Participate in Scrum ceremonies and collaborate closely with cross-functional teams
– Take ownership of technical decisions and proactively identify improvement opportunities
– At least 7 years of experience in Java backend development
– Experience acting as a Tech Lead or leading technical initiatives within development teams
– Strong expertise in Core Java (Java 11–25), including JDBC, concurrency and memory management
– Solid experience with Spring Framework (Spring Boot 2–4)
– Experience with JPA (Hibernate) and Oracle databases, including SQL optimization
– Knowledge of messaging systems, REST APIs, OpenAPI (Swagger) and API First approach
– Strong understanding of microservices architecture, Git, Maven and Scrum
– Good understanding of backend security principles and software quality practices
– Experience writing high-quality unit and integration tests
– Fluent English
– Experience with Kubernetes
– Experience with OpenSearch
– Experience with Ansible
– Experience with Jenkins, Sonar or other build and deployment automation tools
– Experience working in geographically distributed engineering teams
– Experience participating in technical architecture and solution design