Zean Tsoi
CTO at Valid
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolZean Tsoi is a technology leader and current CTO based in San Francisco with 15 years of experience building and scaling consumer web platforms. He rose through engineering roles at Reddit—contributing backend work to historic codebases and ad/tracking features—and managed engineering teams there before moving into executive leadership. Zean combines hands-on backend skills (including campaign management, impression tracking, and data model work) with product-oriented management of large-scale systems. He has a track record delivering award-winning consumer apps earlier in his career and pairs technical depth with business training from Columbia Business School. Known for a candid, team-first style, he brings both startup grit and enterprise discipline to growth-stage engineering challenges.
15 years of coding experience
11 years of employment as a software developer
Bachelor of Science - BS Stonks, Bachelor of Science - BS Stonks at University of California, BerkeleyMBA, MBA at Columbia Business School
Stackoverflow
26,025reputation
2.2mreached
393answers
1question
routes
top-5%
ruby
top-1%
rake
top-1%
activerecord
top-5%
jpeg
top-5%
ruby-on-rails
top-1%
Github Skills (28)
python10
10
ruby10
advertising10
rake10
ruby-on-rails10
javascript9
forms9
sqlite9
jpeg9
heroku9
go9
routes9
database9
csv9
Programming languages (6)
Github contributions (5)
reddit-archive/reddit
Mar 2015 - Sep 2016
historical code from reddit.com
Role in this project:
Back-end Developer
Back-end DeveloperContributions:57 commits, 9 PRs, 34 pushes in 1 year 6 months
Contributions summary:Zean primarily contributed to the back-end functionalities of the Reddit archive project. Their work included implementing third-party tracking pixels, adding features for campaign management, and modifying the system to accommodate new advertising features. The user also made changes to the data models and templates, reflecting their involvement in the overall structure and presentation of the application's features. Furthermore, the commits show the addition of features that allowed the platform to be able to track impressions.
pythonprawjavascripthistoricalarchiver
zeantsoi/GoogleBooks
Dec 2011 - Feb 2015
GoogleBooks is a lightweight Ruby wrapper that queries the Google API to search for publications in the Google Books repository.
Contributions:6 commits, 1 PR, 1 push in 3 years 1 month
ruby-wrapperapigoogle-apigoogle-booksgoogle
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.