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Senior Java Developer at InventYOU AB. We are looking for an experienced . Senior Java Developer (Expert). to join our engineering team, contributing to the design and implementation of enterprise-grade microservices and messaging systems. The ideal candidate will have a strong background in Java development, reactive and functional programming, and DevOps practices.. You will be responsible for delivering robust, secure, and scalable services, improving CI/CD pipelines, and supporting production deployments. This is a hands-on technical role for a developer who can work autonomously, write clean and testable code, and communicate effectively in a fast-paced Agile environment.. Your key responsibilities will be:. . Improve and optimize the development and build process. . Design and implement enterprise-level systems leveraging . microservices. and . messaging patterns. . . Write scalable backend code in . Java. , applying both . functional. and . reactive programming. techniques. . Build applications integrated with . search engines. and other distributed services. . Implement . OAUTH authentication. and validation with . unit. and . integration tests. . . Assist with system deployment, . Kubernetes/Docker setup. , and CI/CD pipeline configuration. . Follow . Scrum. methodologies and contribute to effort estimation. . Ensure secure coding practices, including logging and auditing features. . Maintain technical documentation and follow Git processes (including pull requests). . Deliver high-quality, clean, and maintainable code with minimal supervision. . . University degree (minimum 3 or 4 years) in Computer Science or related field . . At least . 9 years of professional experience. after graduation . . Strong experience with . Java. , . microservices. , and . event-driven architecture. . . Solid hands-on experience with . Kafka. , . CQRS. , or similar asynchronous systems . . Proven ability to develop secure, fast, and scalable backend systems . . Familiarity with . CI/CD. , . Docker. , . Kubernetes. , and Git workflows . . Knowledge of . OAuth. , testing frameworks, and reactive programming . . Experience working in . Agile/Scrum. teams with modern SDLC practices . . Ability to write clean code with excellent testing and documentation practices . . Strong communication skills in English . . . EU citizenship. is required for this role. . Company Location: Greece.