# Back-end Developer

> COSMOTE GLOBAL SOLUTIONS NV · Brussels, Belgium (Hybrid) · Contract · Posted 2026-02-25

**Workplace:** hybrid

## Description

**COSMOTE Global Solutions NV** is at the forefront of the ICT industry as a trusted member of the OTE Group of Companies, dedicated to delivering comprehensive ICT Solutions and Services. We are looking for a talented **Back-end Developer** to enhance our team.

As a Back-end Developer, you will play a critical role in designing scalable applications to meet the evolving needs of our clients. Your expertise will ensure the smooth integration of server-side logic with front-end components, enabling our applications to function seamlessly and efficiently.

**Key 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

## Requirements

-   Bachelor’s Degree in IT or a related field
-   At least 17 years of experience in IT
-   At least one year of expertise in back end:  Vert.x, Kotlin , Java (> 17) , Spring Boot (WebFlux), Hibernate.
-   At least one year of expertise in Architecture & Integration: Microservices Architecture, API-driven Development, AS4.
-   At least one year of expertise in Database: MongoDB , PostgreSQL, Virtuoso Triple Store, OpenSearch
-   At least one year of expertise in Containerization & Orchestration: Docker, Kubernetes
-   At least one year of expertise in Security: OpenID Connect, OAuth2, TLS, Keycloak
-   At least one year of expertise in Security Testing & Dependency Management: SAST, DAST, Fortify, SonarQube, Sonatype, Dependency-Track, Maven
-   At least one year of expertise in Collaboration & Productivity Tools: JIRA, Confluence, Office 365, SharePoint

## Apply

[Apply at COSMOTE GLOBAL SOLUTIONS NV](https://apply.workable.com/cosmote-global-solutions-nv/j/6FFD13893F/apply)

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