JavaScript/TypeScript Developer | Widget Framework Developer

Undisclosed salary
Rotterdam, Netherlands
Front-end | JavaScript
5 days
Work in office


Mendix is on a mission to enable anyone in any organization – from the marketing coordinator to the software developer to the CEO – to create things that are transformational for their company.  We are fundamentally reinventing the way applications are created and we’re reinventing the future of software development.  Sounds ambitious, right?  We agree.

Not to brag, but nearly 4,000 organizations worldwide, including KLM, Medtronic, Merck, and Philips, rely on Mendix to build web and mobile applications.  Thousands of our customers use our platform to delight their clients and empower their employees. It’s no surprise that we’re a recognized Leader by Gartner and Forrester in a red-hot market expected to exceed $21 billion by 2022.  Ok, maybe we did want to brag a little.  But we’re proud of what we’ve accomplished…and…we’re humble enough to admit that we need you to make us even more effective.

Our team is responsible for the framework and API’s on which widgets for Mendix platform are built. This includes the JavaScript API provided in the client for web(ReactJS)and native mobile(ReactNative)widgets as well as the components that allow users to easily configure widgets in Studio and Studio Pro.

The framework is an important part of Mendix platform as it used tobuild our own widgets, and at least important, it allows customers, partners and the community to build any component they want. Developers can just use standard tooling, like JS/TS/ReactJS/ReactNative to build cool components. We make the API’s and tooling that makes it simple!

The team is part of the Frontend group. This group currently consists of six teams and together we are responsible for building great end-user experiences from design time to runtime for web, mobile and augmented reality. 

You're the innovator we need if:

  • You’re an expert in core front-end web technologies like JavaScript / TypeScript, HTML5
  • You like learning new things and techniques, you pick up new languages and technologies based on tasks at hand
  • You are excited by the challenge of complex technical problems
  • You feel responsible for the quality of your work and the impact it has on others
  • You want to become part of a work environment in which your ideas are valued
  • You enjoy the occasional game of skribble and/or an online pub-quiz
  • You’re comfortable working as part of a scrum team


  • You have experience with React or React Native
  • You have experience with MobX
  • You have experience with test frameworks like Jest, WebdriverIO or Selenium
  • You know how to develop accessible web pages
  • You know how to develop responsive web pages

At Mendix we’re flexible in adopting new technologies and methodologies if that makes the product better or our lives easier. Each scrum team is free to choose its own tech stack, so you can always try that latest new idea, framework or design pattern. Our teams are small so that you can have a real influence. We care about open standards, and we’re also big fans of Test-Driven Development. We’re constantly improving our Continuous Integration process, which monitors the quality of our product and makes the lives of our developers and testers easier.


Our Guiding Principles

While we live on different continents, speak different languages, and work on different things, we are bound by our “MendixBlue” guiding principles.  Being “MendixBlue” means that you live the culture, and you consistently improve it as we grow.  It’s kind of a big deal.

We put the customer first.  Without our customers, we have no business.  So, if you act in the best interest of our customers, always…you belong here.

We think big. We work to have a meaningful, lasting impact on the world.  So, if you aim high and think long term…you belong here.

We innovate.  We want to be what happens next.  So, if you ask “what if?” and work to find a way or make one…you belong here. 

We nurture talent.  We look, not just at the sum of what an individual has done, but at the potential of who they can be.  So, if you’re up for learning from your failures…you belong here.

We hear every voice.  Inflated egos don’t last here, humility does.  So, if you share credit and ensure that the best ideas win – regardless of who they come from…you belong here.

We own it.  If something needs doing, we do it. So, if you focus on the outcome, and take initiative to get it done…you belong here.

We have fun.  We use laughter as a common language.  We can ask for help and we’re happy to give it.  So, if you find joy and purpose in what you do…you belong here.

Make your career at Mendix.

There are precious few jobs that let you create the future. But you’ll find one at Mendix. We are at a pivotal time in our company’s existence: where rapid growth meets stable funding.  This is the time for industrious people to raise their hands to solve the next generation of problems. Mendix is a place where ambitious people can thrive; where you can identify an issue, propose a solution, and build the structure to make it happen.

Important to know: Mendix is a Siemens business, which means we’re backed by the resources and stability of one of the world’s largest and most forward-looking enterprises. Think: job security.

Since our company was founded in 2005, our aim has been to create a great work environment for people at all stages in their careers. That’s why we are so pleased and honored that we were rated a top Cloud Computing Company to work for in 2019, based on feedback from our employees on Glassdoor. With offices in the Netherlands, the UK, Germany, and the US, (and more coming), we provide an international playground to truly impact the world through low-code.

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