Senior JavaScript Developer

Leuven, Belgium.


How you'll make a difference

As a Senior JavaScript Developer, it is your responsibility to lift the THEOplayer products to a higher level. This includes improving the software architecture, developing new and advanced algorithms for optimization of existing features and development of new ones. From all members of the engineering team, regular input is requested on the product roadmap and upcoming features, giving you a key role in the future of the products. All engineers at THEO Technologies are both specialists and generalists, and each role is constantly evolving.

Duties & Responsibilities

  • Be part of a highly innovative R&D team;
  • Working on the customer facing software platform where customers can analyze usage statistics and manage their licenses and configurations;
  • Write clean, secure and scalable code;
  • Bring to the world a user friendly video player (which doesn’t need plugins);
  • Make clever use of technology to tackle performance and cross-platform challenges in HTML5 and JavaScript;
  • Improve architecture and functionality of THEOplayer;
  • Be proactive at maintaining and improving the THEOplayer code base and functionality;
  • Contribute to improving our development processes and environments;
  • Work closely with, and incorporate feedback from, product management, interaction designers, and other engineers.

Desired Skills & Experience

  • To be a passionate and genius coder;
  • A demonstrated strong knowledge of JavaScript;
  • To be familiar with DOM manipulation;
  • Experience with prototypal inheritance;
  • Healthy brains which give you technical insights;
  • Algorithmic insights;
  • Insights in good software architecture;
  • Excellent problem solving capabilities;
  • A portfolio of software you developed or helped develop;
  • Passion for the technology world and hunger for knowledge;
  • Highly innovative out-of-the-box thinker;
  • Team player, but you also have the ability to work without constant coaching;
  • Tons of energy, passion, humor and enthusiasm;
  • Loving the challenges and atmosphere of a startup environment.

What we offer

  • A versatile full-time job in the animated city Leuven.
  • A competitive salary with plenty of extra benefits.
  • The opportunity to work for an exciting start-up conquering the world.
  • A place to learn and get in touch with the cutting edge of online video.
  • The company itself is doing exceptionally well. For career-motivated people, there will be upward mobility.
  • A stimulating working environment.
  • Nice and passionate colleagues.
  • Flexible hours.
  • Regular and fun team activities.

Does this sound interesting you?

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

Looking for another opportunity at THEO Technologies? We also have the following openings: