Cobol Mainframe Developer for Public Registry System

HumanInTech; Brussel Hoofdstad; Hybrid; EUR 60,000 - 90,000; Full time

Job summary

HumanInTech Brussels is seeking a skilled mainframe developer to work on a registry project enabling electronic identity card issuance for diplomatic personnel in Belgium. You will design, test, and maintain transaction and management products within the central mainframe system as defined by the analysis.

Required 3–5 years of experience, a Bachelor's degree, and strong Cobol skills. The role is based in Brussels with no remote work option, offering full-time engagement either as a freelancer

Qualifications

• Confirmed experience as a mainframe developer.
• Strong Cobol programming skills.
• Knowledge of Dutch or French is a plus.
• Knowledge of English is a plus.

Responsibilities

• Developing and testing new transaction products and management products within the central mainframe system as specified in the analysis.
• Implementing, managing impact and maintaining the developed applications.
• Continuously adapting, optimising and further developing existing functionalities.

Skills

Mainframe developer

Cobol programming

Dutch or French

English

Education

Bachelor's degree

Job description

What you will do

You will work on a project to establish a new registry within an existing public registry system. The project enables the issuance of electronic identity cards to foreign diplomatic personnel in Belgium, allowing this target group to authenticate electronically and access public online services.

Your responsibilities include:

• Developing and testing new transaction products and management products within the central mainframe system as specified in the analysis
• Implementing, managing impact and maintaining the developed applications
• Continuously adapting, optimising and further developing existing functionalities

What we are looking for

• Confirmed experience as a mainframe developer
• Strong Cobol programming skills
• Knowledge of Dutch or French is a plus
• Knowledge of English is a plus

The setting

This assignment runs from December 2026 for 12 months. The role is based in Brussels with no remote working option.

You can join us for this assignment as a freelancer or as an employee of HumanInTech. Same role, same team. If you join as an employee, your employment continues beyond this assignment. When it ends, we’ll work together to find your next assignment.

Location: Brussels

Work address: Belgium

Employer / contracting party: HumanInTech

Applications close (Brussels time): November 3, 2026 at 1:00 AM

Engagement: Freelance or employed by HumanInTech

Working hours: Full-time

Experience: 3–5 years or more

Education: Bachelor's or more

Published: October 2026