COSMOTE Global Solutions, as a member of OTE Group of Companies, is an ICT Systems Integrator delivering a broad range of ICT Solutions and Services. CGS provides a broad range of ICT Services focusing on: Cloud, Data Centre operations, Networking, Cybersecurity, BI and Data Warehouse, Big Data, Service Desk, Proactive Monitoring, Operations and Support, Service Management, Project and Programme Management, and Professional Services. Responsibilities: Development of back-end website applications. Integration of user-facing elements developed by a front-end developer with server side logic. Implement core business logic. Creation of servers and databases for functionality. Design and implementation of data storage solutions. Understanding and implementation of security and data protection. Optimization of the application for maximum speed and scalability. Design and develop APIs. Participating in the design and creation of scalable software. Taking lead on projects, as needed. Maintenance of code integrity and organisation. Writing clean, functional code on the back-end. Compile and analyse data, processes, and codes to troubleshoot problems and identify areas for improvement. Testing and fixing bugs or other coding issues Meet both technical and consumer needs. Write technical documentation RequirementsBachelor's Degree on a related field. At least 10 years of specific expertise in Back-end: Vert.X, Kotlin, Java (> 17), Spring Boot (WebFlux), Hibernate. At least 6 years of specific expertise in Architecture & Integration: Microservices Architecture, API-driven Development, AS4. At least 6 years of specific expertise in Database: MongoDB, PostgreSQL, Virtuoso Triple Store, OpenSearch. At least 6 years of specific expertise in Containerization & Orchestration: Docker, Kubernetes. At least 5 years of experience in Security: OpenID Connect, OAuth2, TLS, Keycloak. At least 6 years of specific expertise in Security Testing & Dependency Management: SAST, DAST, Fortify, SonarQube, Sonatype, Dependency-Track, Maven. At least 10 years of specific expertise in Collaboration & Productivity Tools: JIRA, Confluence, Office 365, SharePoint Ability to apply high quality standards to all tasks. Ability to participate in multi-lingual meetings, good communication skills. Capability of working in an international/multicultural environment, rapid self-starting capability and experience in working in a team, understanding the needs, objectives, and constraints of those in other disciplines and functions. Ability to adapt to unplanned changes or decisions. Ability to understand, speak and write in English C2.