Mendix developer

Role summary

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.

Main tasks

• 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.

Required qualifications and experience

• At least 5 years of IT development experience, including at least 3 years hands-on with Mendix.

• 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).

Languages

• English at C1 level. French is an asset.