Welcome to the world of HTML5 games! Are you ready to play with us?


JavaScript SDK Developer

Are you an ambitious JavaScript developer with a passion for new technologies and platforms? Do you like working in online games that are played by millions around the world? And do you want to help us bringing our internal SDK to the next level? Than we have an excellent career opportunity for you!

With Flash disappearing and the overcrowded app-stores, HTML5 is now one of the fastest growing game platforms around. And as a next step after our single player games, we have started developing multiplayer, social and Instant games. We are therefore looking for a Mid-Level or Senior JavaScript SDK Developer to strengthen our Studio and help us realize our international growth ambition.


Your key responsibilities:

  •  Maintain our existing SDK which helps games connect to portals;
  • Foresee browsers breaking changes and prevent SDK damage;
  • Develop tools and services to help game developers build better HTML5 games;
  • R&D Projects to bring CoolGames’ best games to new platforms;
  • Help building the next version of the CoolGames’ Game Services API;
  • Be the central point of access with other departments (e.g. Sales team)


Your profile:

  •  Top technical skills and always attuned to new technologies;
  • Pro-active and used to taking ownership and responsibility;
  • Flexible, innovative and a fast learner;
  • Good team player and supportive to other departments;
  • Excellent social, communication and presentation skills;
  • Fluent English speaker and writer


Your qualifications:

  •  At least 4 years of relevant experience with mobile/web design and development;
  • Full proficiency in HTML, CSS, JavaScript and jQuery is required;
  • Solid knowledge of RESTful API’s, JavaScript SDK’s;
  • Fully comfortable with Agile development processes and tools;
  • Experienced with Git, Grunt, Bower;
  • Familiarity with Online Advertising Implementation;
  • Experience working with a MVC framework on the client side is desirable;
  • Experience with HTML5 / Canvas / Games or TypeScript is a plus


We offer:

  • A highly dynamic job with a competitive salary
  • Company pension plan and travel cost compensation
  • Optional company stock plan participation
  • Health care insurance compensation
  • An attractive office location in the center of Amsterdam
  • An open, informal and international company culture


About CoolGames:

CoolGames is the leading HTML5 games developer and publisher in the world. Alongside developing native quality HTML5 games with high profile IP’s such as Tetris, Pac-Man, Snoopy and Miffy, we also distribute games globally reaching millions of players each month. Our in-house developed title Jewel Academy is the world’s most successful match-3 game ever released in HTML5.

BoosterMedia was founded in late 2009. In early 2016 we joined forces with Tingly Games and became what is now CoolGames. We have an ambitious and innovative team with over 50 colleagues from all over the world. Our headquarters and studio are in the center of Amsterdam, The Netherlands. The company also has an office in Tokyo, Japan, and a senior representative in San Francisco, USA

Candidate contact only – no agencies