Cobol developer AS/400

NN Insurance Belgium nv

38 months

French Dutch English
850€ /day

07/03/2023 - 07/05/2026


Sign in to apply



Unfortunately, we have noticed that there are still candidates proposed who do not match the requested profile. We therefore again urge you to present only candidates who match the job description. If the above question is not respected, NN and/or ProUnity reserve the right to disqualify.

Any questions regarding this application should be addressed to ProUnity.


NN is a life insurer with great ambitions in Belgium. We protect what is most dear to our customers: their families. We see this as a very personal matter, and we want to make a difference. 

With 1.4 million unique customers, 600 happy employees and an annual turnover of EUR 1 billion, we are part of a strong international group.


Develop, maintain and run jobs on the mainframe to support crucial business processes during the replatforming project and beyond. Learn different software environments to support the lifecycle of the solutions on the new platform.


Overall Responsibilities

As a Mainframe developer, you are responsible for the running and maintaining of business crucial processes of NN. A replatforming project is started and the mainframe solutions will be ported to Java in the next year. In a plus you can support your colleagues in acquiring Java experience. Together with the team you will decide every 2 weeks what tickets you can take up. You will be in contact with the Business and supported by your colleagues to fulfil them, but you work mainly autonomic.  Automation of manual processes is highly encouraged.  You will work on different applications but an onboarding is foreseen to learn them one by one.

 Executes following tasks

  • Run and maintain processes on the mainframe programs
  • Communicate clearly to business on the status of the execution
  • Develop atomisation for manual tasks
  • Develop improvements on the programs based on the requirements of business
  • Test the flows, and ensure the required performance
  • Ensure best practices are used


  • Experience with 
    • Cobol is a must
    • Mainframe is a must
    • A mainframe editor, file transfer and scheduler is a must.
    • Java is a plus
    • Development tools like TSO, ISPF, NDVR, JCL , OPC MFT CICS, IDMS is considered a plus
  • Learns fast and is willing to learn different technologies.
  • Is willing to stay for longer term


Ready to work as a team player in an Agile scrum team located next to the Brussels South train station on a full time basis.


Mainframe Developer - Senior


French - Nice to have

Dutch - Nice to have

English - Professional working proficiency


As400 - Expert

Cobol - Advanced