Software Engineer

Leuven, Belgium (Europe)

Full-time, Hybrid


About THEO Technologies

THEO is a scale-up on a mission to change the way the world streams video over the internet. Our flagship product is THEOplayer which enables our customers to stream videos on all kinds of devices and platforms (Web, Android, iOS, Roku, ...). Chances are high you have used it already. Maybe watched a video on Vrt Nu, Yelo or CNN? That's all THEOplayer! It offers a variety of features like content protection, advertisements, analytics and so on. THEO also has an innovation team which invented the HESP streaming protocol. It is specifically designed for ultra low-latency streaming that other protocols just can't offer at the same scale.


Your role

We are looking for an experienced JavaScript Developer to strengthen the development team at THEO Technologies. You help us lift the core of our THEOplayer product to a higher level by optimizing and implementing features, improving the architecture, writing tests and helping your peers improve their coding practices. You love the challenge of a technically complex product and believe that every challenge can be overcome by clean code, good architecture and teamwork. All our engineers are both specialists in certain domains and generalists in our technology. We are a growing company, which creates opportunities to constantly evolve and grow in your role.


What you'll learn and do

  • Tackle difficult challenges in TypeScript;
  • Be proactive at improving the THEOplayer code base, architecture and functionality;
  • You're a vibrant part of our team of passionate developers and help juniors to improve their coding practices;
  • Work together with product managers to analyze functional requirements and design, document and implement an appropriate solution;
  • You work in an agile team. This means you should feel comfortable with working in short sprints, pair programming, daily standups, …
  • Get familiar with our in-house multi-platform test setup that puts feature testing to the next level.
  • Occasionally, you work directly with our customers to resolve any issues they are facing.

About you

  •  You have 3+ years of experience as a JavaScript (TypeScript) software developer;
  • You have an excellent eye for good code architecture and clean code;
  • Your knowledge of JavaScript (TypeScript) and its core concepts is strong;
  • You are happy to mentor junior software developers and help them improve their coding practices;
  • You gained some experience with core web technologies like fetch, streams, … and experience with streaming media is an advantage;
  • You're a team player that knows when to work together and when to fly solo;
  • You have tons of energy, passion, humor and enthusiasm;


What we offer

  • A competitive salary with plenty of extra benefits;
  • The opportunity to work for an exciting scale-up with a stimulating working environment, which values action, courage and curiosity with stunning and passionate colleagues;
  • Personal development: a chance to grow and to develop your strengths while working with many bright minds and to get in touch with the cutting edge of online video;
  • A hybrid working policy with flexible working hours;
  • Regular and fun team activities.

Does this sound interesting to you?

Please send your resume and cover letter to We look forward to hearing from you.

Looking for another opportunity at THEO Technologies?