Hi, I'm Tijn Kersjes [tɛin kɛʀʃʏs]

Full-stack coffee lover.

I have studied Computer Science, am a JavaScript enthusiast, and am interested in everything functional and reactive. When not enjoying a good cup of coffee, I like to tinker around with new (web) technologies, and work on tools/workflows that improve developer experience.


Date of birth
7 april 1993

Utrecht, the Netherlands


Utrecht University 2011 – 2015; 2016 – 2017
BSc Computer Science

Sintermeerten College 2005 – 2011
Secondary school


Reaktor May 2017 – Current
Software engineer

Konnektid December 2013 – February 2017
Full-stack web developer

CreativeCrowds October 2013 – December 2013
iOS application development and testing

Indievelopment January 2012 – May 2015
Organising an annual independent game development conference in the Netherlands

DGDARC January 2012 – December 2014
Board member at the Dutch Game Development And Research Club

driezesnul (currently Betawerk) September 2010 – May 2011
Web application research & development


Frameworks & Libraries
Node.js, React, Redux, XNA, Cocoa Touch, SDL

JavaScript (ES6), C#, Objective-C, PHP, Python, Java

Servers & Databases
NGINX, HAProxy, RabbitMQ, Redis, MongoDB, CouchDB, Neo4j

Docker, Ansible, Jenkins, GCloud, AWS


FOSDEM February 2019
GBForth: Using Forth to understand the Game Boy. Video and slides.

AmsterdamJS December 2018
Codemods: Refactoring JavaScript with JavaScript. Video and slides.


GBForth July 2018
A Forth-based Game Boy development kit.

Pom December 2013
Small time tracker for people using the "Pomodoro technique". Available for iPhone.

Qamar June 2013
Application for calculating Islamic prayer times and locating the Qibla. Available as a web app (source) and for iPhone.

Timewave Zero April 2012
Puzzle platformer involving time traveling. Won the third prize in the Creative Game Challenge.

Baby Gaga March 2012
Experimental top-down game based on a tweet of @PeterMolydeux for the first Molyjam in Utrecht.

Timewave August 2008
Featured in the 3th YoYoGames competition.

Brain Teaser June 2006
Educational game, placed second in the Make-a-Game competition.




Personal blog