Develop, evolve and maintain back-end applications in Java 17+, using Spring Boot
Design and implement REST APIs (and occasionally GraphQL), ensuring best practices for design, security and performance
Actively participate in technical refinement of requirements together with product and architecture teams
Contribute to system architecture decisions, especially in microservices environments
Implement and maintain integrations between internal and external systems
Ensure code quality through automated tests, code reviews and engineering standards
Maintain and evolve relational databases, modeling data efficiently
Support observability, monitoring and incident resolution in production
Collaborate with the team on CI/CD, automation and cloud initiatives
Mentor less experienced developers and promote best practices within the team
Contribute to continuous improvement of processes, application performance and reliability.

Proven experience as a Senior Back-End Developer
Strong knowledge of Java 17 or higher
Advanced experience with Spring Boot, Spring MVC, Spring Data and Spring Security
Experience developing RESTful APIs
Experience with relational databases (PostgreSQL, MySQL or similar)
Knowledge of microservices architecture and system integration
Experience with messaging or asynchronous processing
Proficiency with Git and collaborative versioning workflows
Experience with automated testing (JUnit, Mockito, Testcontainers or similar)
Experience with Docker and CI/CD pipelines (GitHub Actions, GitLab CI or similar)
Familiarity with cloud environments (AWS)
Good communication skills, autonomy and a critical perspective on technical solutions
Nice-to-haves (not required, but highly welcome):
Experience with Java 21
Knowledge of event-driven architecture
Experience with Kafka, RabbitMQ, SQS or SNS
Experience with Infrastructure as Code (Terraform, CloudFormation)
Experience with observability and monitoring (CloudWatch, Prometheus, Grafana)
Knowledge of security best practices (OAuth2, JWT, OpenID Connect)
Previous experience as a technical reference or informal team lead
Experience with high-availability, large-scale systems.

Senior Back-End Developer

Key skills