Senior Mendix Developer

Senior Mendix Developer — Sustainability Platform Location: Rotterdam, Netherlands (Hybrid) Hours: 32–40 hours per week Language: English (C1+) — Dutch not required. No VISA sponsorship possible . Our client builds the ESG platform that enterprises use to track, reduce, and report their environmental impact — carbon, water, waste, supply chain, and regulatory disclosure — across industries from construction to financ e. They're a small team (7 in NL), no hierarchy, a lot of ownership. Fast-moving and deliberately low on structure — you'll help shape that as they grow. One week you're building a platform module; the next you're demoing to an enterprise client. It's a product-led company that's commercially focused, so you'll see your work land with real customers. An AI lead is joining now — there's real opportunity to shape how AI enters the platform from the sta rt. If you want your code to count for something, this is the r ole. What you'll wo rk onDevelopment and maintenance of a modular, multi-app sustainability platformCustomer-facing implementations across carbon management, ESG disclosure (including CSRD), supply chain transparency, and water & waste stewardshipApp template builds and custom application developmentIntegration of AI capabilities into Mendix solutionsDemoing the platform to prospective and existing cust omers What our client is looki ng forReq uired:Minimum 3 years of Mendix development experience, preferably customer-facingMendix Advanced certification (Expert preferred)Ability to take a leading role in customer projects and internal initiativesC1+ English — Dutch not requiredEligible to work in the NetherlandsAvailable to work at least 32 hours per weekAn interest in sustaina bility A plus:Experience or knowledge in the ESG / sustainability domainExperience integrating AI into Mendix so lutions What our clien t offersCompetitive base salary with variable componentNet sales proceeds bonus and equity optionsComprehensive benefits package30 vacation days (based on 40-hour week)Hybrid working — shared office space in Rotterdam, with full flexibility to work remotelyInternational projects with customers across multiple industries and geo graphies