Lead Mendix Developer

Lead Mendix DeveloperAt PSOhub, you work on one product: a professional services platform used by companies around the world. This is a hands-on technical lead role. You will keep building yourself while taking increasing ownership of the technical direction of our Mendix team. You will help shape how we build, improve the product and grow the team around it. Your work has two sides. You build new features and keep the platform fast, stable and secure as we grow. And you build our MCP server, which lets Claude, ChatGPT, Gemini and Copilot work with real operational and financial project data in PSOhub. What you will work onAbout 70% of your week is building. In our Mendix 11 app, you develop new features and continuously improve performance, stability and security. Next to that, you develop our MCP server, connect it to the major LLMs and build tools that let users take specific actions in PSOhub through AI. The other 30% is where your lead responsibility comes in. You will help set technical direction, make architectural decisions, review solutions and code, and help establish the standards we use as the team grows. You will mentor other developers and help build the Mendix team around you. You will also handle second-line support. When our Customer Success team cannot resolve an issue, you find the cause, fix it properly and keep support posted. You see how customers really use what you build, and that makes you better at building it. You are not moving away from development to become a manager. You remain hands-on, while becoming the person who helps determine how the team builds and where it goes technically. Who you will work withYou will work directly with our CTO, exchanging ideas and challenging each other on technical decisions. On a weekly level, you will also work with Martijn van der Hoeden, our CEO and product owner. He has been building project management and PSA software for over 30 years. You will have a direct line to the people making product and technical decisions. Your input is expected, not just requested. As the Mendix team grows, you will play an important role in shaping that team and helping new developers become successful. Where you will workMostly from home. On occassions, we get together in Bussum for brainstorm, demo's or business updates. What you bring5+ years of hands-on Mendix experience, ideally working on commercial or customer-facing products.Strong experience working with and extending existing Mendix applications in a structured, thoughtful way.The technical maturity to make decisions, challenge existing solutions and take ownership of the outcome.You naturally take the lead when technical decisions need to be made and enjoy helping other developers grow.Strong analytical thinking and problem-solving skills.A proactive, hands-on mentality. You see what needs to happen and take ownership without waiting to be asked.Comfortable working directly with customer support and end users to investigate and solve issues.A pragmatic mindset and the ability to balance long-term quality with short-term goals.Solid knowledge of REST integrations, performance, testing and Mendix security.Curiosity about AI and LLMs. MCP experience helps, but you can learn it here.You can explain technical concepts clearly to both developers and non-technical colleagues.Nice to have: DevOps, automated deployment, HTML/CSS.Fluent English and/or Dutch.You may not have had the formal title of Lead Developer before. That is fine. What matters is that you are already taking ownership, influencing technical decisions and helping other developers become better. What you get€5,000 to €6,500 gross per month depending on experience, plus 8% holiday allowance.A hands-on Lead role with real influence on the technical direction of the product and team.€1,500 a year for learning, including Mendix certifications.€120 net per month expense allowance.A laptop.Flexible hours. You plan your own day, we look at what you deliver.Direct access to the CTO and CEO.The opportunity to help build the Mendix team rather than joining an established team with a fixed way of working.A real say in the product and in where we take AI next.How we hireFirst an online call with Jarno, our CTO. Then you meet Jarno and Martijn at the office. After that you demo a practical case. From first call to decision takes about two weeks. Good to knowYou need to live in the Netherlands and have the right to work here. We cannot sponsor visas.