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 finance.

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 start.

If you want your code to count for something, this is the role.

What you'll work on

• Development and maintenance of a modular, multi-app sustainability platform
• Customer-facing implementations across carbon management, ESG disclosure (including CSRD), supply chain transparency, and water & waste stewardship
• App template builds and custom application development
• Integration of AI capabilities into Mendix solutions
• Demoing the platform to prospective and existing customers

What our client is looking for

Required:

• Minimum 3 years of Mendix development experience, preferably customer-facing
• Mendix Advanced certification (Expert preferred)
• Ability to take a leading role in customer projects and internal initiatives
• C1+ English — Dutch not required
• Eligible to work in the Netherlands
• Available to work at least 32 hours per week
• An interest in sustainability

A plus:

• Experience or knowledge in the ESG / sustainability domain
• Experience integrating AI into Mendix solutions

What our client offers

• Competitive base salary with variable component
• Net sales proceeds bonus and equity options
• Comprehensive benefits package
• 30 vacation days (based on 40-hour week)
• Hybrid working — shared office space in Rotterdam, with full flexibility to work remotely
• International projects with customers across multiple industries and geographies