Hi, I’m Charles Feng. Here’s a short summary of what I’ve done.

To get in touch, send me an email at or find me on LinkedIn, GitHub, or Twitter.


Poynt — Software engineer April 2014 – Present

Building the world’s first smart payment terminal and open commerce ecosystem. — CTO & co-founder July 2012 – April 2014

Building a business-to-customer communications platform on top of calendar.
Was in the StartX Winter 2013 session.


Stanford University September 2009 – December 2011 [left]

Doctor of Philosophy, Bioengineering

University of Illinois September 2005 – June 2009

Bachelor’s Degree, Bioengineering


Fcancer July 2013 - Present

An online community for volunteers to pledge their skills to cancer charities. Start the fight young.

Hush – private bookmarking July 2013

Simple, secure private bookmarking for incognito browsing. Available on Chrome and Firefox.
Featured on Lifehacker.

Cointerest December 2013 [offline]

Yelp for cryptocurrencies. Local businesses, ratings, and more.

Transit September 2013 [offline]

Responsive, location-aware web app for displaying real-time Caltrain and BART schedules.
Source code on GitHub.

Project Euler May 2013 – Present

Solving a series of computational problems with Haskell, Javascript, and Python.

ember-calendar Jan 2013 – Apr 2014

Calendar component for Ember.js. Source code on GitHub.

Mastermind November 10-12, 2012 [offline]

Real-time data aggregation dashboard, distilling & presenting business data in a visually pleasing format.
Placed 2nd worldwide out of ~150 teams at Node Knockout 2012. Source code on GitHub.

Happenology January – June 2012 [offline]

Event and trip planning service for groups, featuring scheduling, to-do and to-bring lists, route planning and more.

Virtual Bioimaging Laboratory September 2007 – March 2008 [offline]

Online, interactive virtual laboratory where students could perform simulated experiments using various biomedical imaging modalities.

Metaspectra June 2006 – August 2006 [offline]

Searchable database of Fourier transform infrared (FTIR) imaging data, with results linked to appropriate journal articles.


Startup School Notes October 19, 2013

Inspiration and knowledge gained at YC Startup School 2013.
370+ stars on GitHub; popular on Twitter.


MCAT prep outlines February 2008 – March 2012

Received a 42S (99.9% percentile) on the MCAT in January 2008; started teaching for Examkrackers soon after that. Created and used these outlines during my four years of teaching.

High school study guides September 2001 – June 2005

Made and freely distributed study guides for high school honors and AP classes. Downloaded over 200,000 times.