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Cosmote Global Solutions

Back-end Developer

Cosmote Global Solutions
Belgium · Contract · Not Applicable
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

Key Skills

Ranked by relevance

server containerization microservices spring boot postgresql confluence kotlin docker java jira
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Belgium

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Posted
May 08, 2026
Type
Contract
Level
Not Applicable
Location
Brussels
Company
Cosmote Global Solutions

Industries

IT Services IT Consulting

Categories

Other

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