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