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Cronos Europa

Back-end Developer with Expertise in Java, Vert.x

Cronos Europa
Belgium · Full-time · Entry
We are currently looking for an "Back-end Developer with expertise in Vert.x, Kotlin, Java" to strengthen the Cronos Europa team.

Nature of tasks

  • 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

Specific expertise and technologies

  • 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

Knowledge And Skills

  • 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.
  • High degree of discretion and integrity is required as the applications managed and maintained in SANTE.R.4 contain personal and confidential data

Why cronos group?

We'll Propose You

  • An attractive salary package
  • A good work-life balance environment
  • The assurance of working in cutting-edge technologies in an entrepreneurial spirit
  • The opportunity to develop your skills thanks to tailor-made training courses according to your needs
  • A good job in a friendly place

If you wish to integrate a dynamic structure on a human scale while working with the latest technologies, don't wait anymore and join Cronos!

Key Skills

Ranked by relevance

kotlin java containerization microservices spring boot kubernetes postgresql confluence storage docker server maven jira
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Country Guide

Belgium

International hub for EU careers

Posted
Nov 06, 2025
Type
Full-time
Level
Entry
Location
Brussels
Company
Cronos Europa

Industries

Professional Services

Categories

Engineering Information Technology

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