Design, develop, and maintain scalable backend features – from REST APIs to the persistence layer – using Spring Boot with Java and/or Kotlin, Actively contribute to the evolution of our cloud-native microservice architecture, Continuously improve our system landscape using modern technologies such as Docker, Kubernetes, CI/CD pipelines, and asynchronous pub/sub mechanisms, Provide technical and functional input for new product and solution ideas, including architecture and technology decisions, Ensure high code quality and long-term maintainability through test-driven development, automated testing (e.g., JUnit, Mockito, MockK), and static code analysis, Mentor and support junior developers while fostering a strong engineering culture focused on learning and knowledge sharing, Collaborate closely with product management, developers, and domain experts to translate business requirements into scalable technical solutions, Actively participate in internal knowledge exchange and continuously stay up to date with backend, cloud, and software engineering trends