Mendix Developer

Role summary

We are looking for an experienced Mendix Developer to join an international ICT environment and lead projects involving multiple teams and application areas.

Main goals: designs, builds and maintains business applications on the Mendix low-code platform within the GSC's environment. Work in agile, multidisciplinary teams alongside business analysts, UX/UI designers, testers and project managers, and apply the GSC's shared development principles so that applications stay consistent, maintainable and reusable across the Mendix portfolio.

Education: Minimum 3 years of relevant education (bachelor or equivalent) after the secondary school.

Minimum Experience: at least 5 years of IT development experience, including at least 3 years hands-on with Mendix.

Working method: Hybrid, 80% on-site in Brussels at the client's premises, which is a prestige public institution.

🔹 Key Requirements

• Mendix Advanced Developer certification (minimum).
• Proven delivery of at least two Mendix applications into production, including integration with enterprise systems.
• Experience with Mendix 10 or later, on-premises or private cloud deployment.
• Working knowledge of Java and JavaScript for custom actions and widgets.
• Experience working in Scrum or similar agile frameworks.

🔹 Assets

• Mendix Expert certification.
• Experience in an EU institution or public administration.
• Experience with Mendix AI capabilities (e.g. GenAI connectors, Maia).

🔹 Responsibilities

• Translate user stories and business requirements into working Mendix applications (domain models, flows, pages, security roles).
• Build integrations with internal and external systems via APIs and database connectors, and implement single sign-on (SAML/OIDC).
• Develop reusable modules, widgets and components in line with GSC standards, and contribute to a shared component library.
• Apply secure-by-design practices, role-based access control and data protection requirements.
• Build accessible interfaces that meet WCAG 2.1 AA.
• Write unit and automated tests, take part in code reviews, and use the Mendix Quality Add-ons or equivalent to keep technical debt under control.
• Support deployment, release management and third-level maintenance of applications in production.
• Produce and maintain technical documentation.

Languages

• English: C1 level
• French at B1 level is a plus

What we offer

• International and multicultural working environment
• Opportunity to work on complex ICT projects

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