Senior Mendix Developer

Note: This job posting has a strong preference for Dutch speakers.

Your role in our team
The Mendix Senior Developer / Technical Lead is responsible for leading the technical delivery of Mendix solutions while remaining actively involved in development activities. This role provides technical leadership to the team supports solution architecture decisions ensures adherence to best practices and drives application performance scalability and maintainability. The Senior Developer works collaboratively with developers architects business stakeholders and project teams to deliver high-quality business solutions.

Experience
5 years of Mendix development experience.
Proven experience working on enterprise-scale and production-critical applications.
Demonstrated experience leading development teams or acting as a technical lead.
Mendix Advanced and/or Expert Certification preferred.

Technical Requirements
Deep expertise in Mendix application development.
Strong understanding of solution architecture and application design principles.
Advanced domain modelling expertise.
Extensive experience with integrations (REST SOAP APIs external systems).
Strong knowledge of Mendix security performance optimization scalability and governance.
Experience with CI/CD monitoring and production support.
Ability to review application architecture and identify improvement opportunities.
Experience establishing development standards and best practices.

Additional requirements
A completed (technical) HBO/WO education preferably in Business Informatics;
Good command of the Dutch language both written and spoken.
Affinity with user experience design
Affinity with (Mendix) testing frameworks such as Mendix unit testing Robot framework and Playwright;
Demonstrable work experience with databases

Key Responsibilities

Technical Leadership
Provide technical leadership and mentorship to junior and medior developers.
Support team members in resolving complex technical challenges.
Conduct code reviews and ensure development quality standards are maintained.
Drive adoption of Mendix best practices across the team.

Solution Architecture
Guide application architecture decisions and technical design.
Assess technical feasibility of business requirements.

Delivery & Quality
Participate in hands-on development of critical features and components.
Review solution designs integrations security configurations and data models.
Ensure development standards security guidelines and governance requirements are met.
Identify technical risks and implement mitigation strategies.

Performance & Continuous Improvement
Lead performance optimization initiatives.
Review application performance metrics and recommend improvements.
Drive technical debt reduction and application modernization efforts.
Promote reusable components standardization and continuous improvement.

Team Collaboration
Work closely alongside the development team rather than solely directing activities.
Foster a collaborative and supportive team environment.
Coordinate with Product Owners Business Analysts Architects and Operations teams.
Support planning estimation and delivery commitments.

Required Competencies
Strong leadership and mentoring skills.
Excellent problem-solving and analytical abilities.
Collaborative and team-oriented mindset.
Ability to balance technical excellence with delivery objectives.
Proactive ownership and accountability.
Strong focus on coaching and enabling team success.

Why CGI
CGI is one of the worlds largest IT consultancy firms. Our people keep the Netherlands running. Government agencies banks (aero-) space infrastructure organizations and energy and manufacturing companies are clients of CGI. We work on interesting projects that touch the daily lives of millions of people. We are present regionally augmented with global domain knowledge our ecosystem and colleagues spread all over the world. We are proud of the impactful projects that we together with our colleagues make a success.

At CGI we place great value on diversity and inclusion as this not only promotes collaboration but often leads to better results. We look forward to your contribution to our team!

Work in small self-managing teams consisting of experts in your field
Take control of your own career with the space to continue developing yourself
You work with the latest technologies
An excellent salary and attractive secondary employment conditions
Immediate permanent contract
Part-time possibilities
And the opportunity to become a CGI shareholder

Join our team of experts and apply now!
We will contact you as soon as possible. Questions about the position Ask them to Joe Knightly VP Consulting Services via or

For more information about the application procedure please contact recruiter Jana Kreckova via


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