Charles Ko


Professional Experience

Welltok – Senior Software Engineer-  (03/2014 – present)

  • Maintains and develops application servers and micro-services using Ruby on Rails and Node.js backed with MySQL and PostgreSQL (hosted on AWS as RDS instances)
  • Maintains and adds news features for front-end web applications using React and Redux frameworks
  • Develops mobile applications for iOS and Android (Swift, Java, and Kotlin)
  • Core Product: CafeWell

Lively – Developer –  (07/2013 – 02/2014)

  • Primarily a server side engineer handling server application logic and database (Python and PostgreSQL)
  • Responsible for the Windows Phone 8 mobile application – C#
  • Contributed development work towards the HTML5 application (using custom framework)
  • (Now acquired by VNUE)

RoomWarden – Developer –  (08/2012 – 02/2013)

  • Side-project start up consisted of 4 team members – dissolved with crushed hope as of now.
  • Created a working prototype with Django
  • Created a working beta stage app with node.js and mongodb for backend, iOS/Android apps for consumers, and web admin tool for provisioning

Mindbloom – Software Development Engineer –  (02/2010 – 03/2014)

  • Full stack application developer working with – Python, PostgreSQL, AWS, Titanium Appecelerator, Objective C/iOS SDK, Java/Android SDK, C#/WP8 SDK, HTML5/CSS3/Javascript, jQuery, Raphael (SVG magic)
  • Projects worked on:
  • Acquired by my present employer – Welltok


  • 2009 – University of Washington – B.S. in Informatics with minor in Physics. Cum Laude.
  • 2017 – University of Washington – M.S. Physics – Artificial Neural Networks | Quantum Boltzmann Machine