React Developer

React Developer, with Full-Stack ambitions

Digital Twins are reshaping industries! Their contextual interfaces and simulation, prediction or anomaly detection capabilities truly drive innovation. And we at Mr. Watts are right at the forefront. We’re building smart solutions that blend deep tech with beautiful, user-focused design.

We’re currently looking for a React Developer to join our team, made up of six passionate and experienced engineers. You'll help us craft stunning frontend experiences! And if you’ve got full-stack or AI-assisted development ambitions, there's plenty of room to grow into that space too.

Sound like your kind of vibe? Keep reading!

Do you know Mr. Watts?

We’re a tight-knit group of tech enthusiasts who build beautiful and useful things for organizations like EUROCONTROL, Port of Antwerp-Bruges, SCK CEN, DEME, IKEA, Orange, Proximus or Medi-Market. Whether it’s a Digital Twin of European airspace or intuitive interfaces for enterprise platforms, we take pride in work that pushes boundaries.

Curious about what we build? This walkthrough video of the project we did for EUROCONTROL serves as a great example of how we blend tech and design.

We’re part of the Cronos Group, but we operate with the flexibility and creativity of a startup. Our team combines senior engineering skills, genuine camaraderie, and a passion for building clean, scalable, and modern software.

No fluff, just results and enthusiastic energy (together with good music).

What are your future challenges?

You’ll join a team of experienced developers working on custom frontend applications for our clients. Each project is different, but always innovative.

Your main focus:

• Build performant, accessible, and delightful React frontends based on modern standards and designs.
• Collaborate closely with the UX designer and Product Owner for delivering real impact to end users.
• Integrate with APIs (REST, GraphQL, or OpenAPI-spec’d) and help shape the data contracts.
• Think about UX, performance, maintainability, and modularity in everything you build.
• Learn and contribute in adjacent areas such as NodeJS, .NET, and MS Azure —if desired.

If you're into full-stack work, you might also:

• Implement services in NodeJS or .NET / C#.
• Help define backend architecture and webservice APIs.
• Contribute to infrastructure, CI/CD pipelines, and cloud environments (mostly MS Azure).

Or if you like to explore the new possibilities AI-driven development flows offer, we're keen to have you:

• Assist in adopting LLMs, MCP servers, agents, etc... into our software development lifecycle. 😉

What do we expect from you?

Core Skills:

• 2 to 4 years of experience building frontend web applications.
• Strong grasp of HTML, CSS and modern JavaScript or TypeScript.
• Real-world experience with React, and common tools like Redux, React Query, or similar.
• Comfortably working with NodeJS / NPM for frontend development.
• Able to consume APIs and collaborate with backend engineers.
• Fluent communication in Dutch and English, both spoken and written.

Bonus points for:

• Experience with backend technologies (.NET, NodeJS, PostgreSQL).
• Understanding of CI/CD, automated testing, and version control (GIT).
• Familiarity with MS Azure services, containerization, and security best practices.
• Proven knowledge about geospatial (GIS) technologies.
• Being passionate about the aerospace, aviation or nautical industries.
• Experience with AI-assisted software development principles.

Why would you choose for Mr. Watts?

In short, this is the opportunity to leave your mark on the future of Digital Twins at forward-thinking companies.

Furthermore, Mr. Watts is part of the Cronos Group, which means you get the best of both worlds. You work in a dynamic, agile environment with the opportunities of a large organization. Our open office space in Hasselt at the Corda Campus offers an inspiring place to collaborate. Additionally, you will frequently be in Brussels with clients to stay in touch. We also work with flexible hours, giving you the freedom to organize your work.

Our salary package...

What’s in it for you?

• A competitive salary based on your experience.
• A beautiful company car with fuel / charging card.
• 20 vacation days + 12 ADV days.
• High-performance laptop and your choice of iPhone, iPad, Pixel or other device.
• Smartphone subscription & internet at home.
• Hospitalization & group insurance.
• Meal & eco vouchers.
• Projects you’ll be proud of. 😉