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COBOL Developer (Mainframe)

As a COBOL developer, you build and maintain mainframe applications for a new protocol register within a national population register. You work on site in Brussels.

FreelanceSoftware DevelopmentBrussels · On site

Apply by 28 October 2026

About the mandate

For a public sector organisation in Brussels, we are looking for a COBOL developer to help set up a protocol register within the register of natural persons. The related project will make it possible to issue electronic identity cards to foreign diplomatic staff in Belgium, so that this target group can authenticate electronically and gain access to public online services. You are responsible for the implementation, impact management and maintenance of the applications developed. Within the central system, you develop and test the new transaction and management products resulting from the analysis. You also continuously adapt, optimise and further develop existing functionalities. Remote working is not possible.

Responsibilities

  • Implementing the new applications for the protocol register
  • Impact management and maintenance of the applications developed
  • Developing and testing new transaction products on the central system
  • Developing and testing management products according to the analysis
  • Adapting, optimising and further developing existing functionalities

Must-haves

  • Experience with COBOL
  • Experience as a mainframe developer
  • Willing to work fully on site in Brussels

Nice-to-haves

  • Knowledge of Dutch or French
  • Knowledge of English

What the employer offers

  • A project with social relevance in the field of electronic identity
  • Working on a central system of a public sector organisation
  • Work location in Brussels

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