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COSMOTE Global Solutions NV , a distinguished member of the OTE Group of Companies, is an ICT Systems Integrator offering a comprehensive range of ICT Solutions and Services. We are actively seeking a seasoned Back-end Developer to strengthen our innovative technology team. In this role, you will be responsible for developing and maintaining robust server-side applications, ensuring seamless integration with front-end components, and optimizing system performance. You will collaborate with cross-functional teams to deliver scalable, secure, and efficient back-end solutions that meet business requirements. Key Responsibilities: Develop and maintain scalable back-end services and APIs. Implement core business logic and ensure data integrity and security. Integrate server-side logic with front-end components. Design and optimize databases for performance and reliability. Adopt secure coding practices to protect application and data security. Follow best practices for code quality, versioning, and documentation. Conduct code reviews, debugging, and testing to identify and resolve issues. Collaborate with product managers, front-end developers, and other stakeholders during the development lifecycle. Participate in architectural decisions and technology evaluations to improve system design. Maintain up-to-date technical documentation. Requirements Bachelor’s Degree in Computer Science, Engineering, or a related field. Minimum of 13 years of professional experience in back-end development. Strong proficiency in Java (version 17 or above), Kotlin, vert.x, Spring Boot (WebFlux), and Hibernate. Experience with microservices architecture and API-driven development. Knowledge of integration protocols such as AS4. Proficient in database design and management using MongoDB, PostgreSQL, Virtuoso Triple Store, and OpenSearch. Hands-on experience with containerization and orchestration tools such as Docker and Kubernetes. Solid understanding of security frameworks including OpenID Connect, OAuth2, TLS, and Keycloak. Experience with security testing and dependency management tools such as SAST, DAST, Fortify, SonarQube, Sonatype, Dependency-Track, and Maven. Proficient with collaboration and productivity tools including JIRA, Confluence, Office 365, and SharePoint. Excellent problem-solving skills, with the ability to work effectively in a multicultural and international environment. Fluent in English (C2 level) both spoken and written. Strong communication skills, adaptability, and capacity to work under changing requirements.