yale computer
society
A packed room watching teams present at y/cs Demo Day

Yale's premier tech organization and developer community.

people use y/cs apps
20,000+
people use y/cs apps
student developers & designers
80+
student developers & designers
products live on campus
7
products live on campus
Catalyst mentees each year
50+
Catalyst mentees each year

Partners, past & present

  • Citadel
  • Hudson River Trading
  • Jane Street
  • D. E. Shaw & Co.
  • MiniMax
  • QNX
  • Tsai CITY

Where our members land

  • Google
  • Meta
  • Microsoft
  • Amazon
  • NVIDIA
  • Netflix
  • LinkedIn
  • Salesforce
  • Red Hat
  • OpenAI
  • Databricks
  • Roblox
  • Coinbase
  • Plaid
  • Y Combinator
  • Jane Street
  • Optiver
  • Bloomberg
  • Morgan Stanley
  • McKinsey & Company
  • BCG

01 — What we ship

Built by students. Used by all of Yale.

See all products on GitHub →

8 products, built and run by y/cs

Select a product to explore · auto-plays

Course search & reviews · coursetable.com

CourseTable

The course browser nearly every Yalie opens during shopping period. Ratings, workloads, professors and meeting times for every course in one sortable table, plus a worksheet to plan your schedule.

Open CourseTable →
01 / 08
The CourseTable catalog showing Fall 2026 courses with ratings and workload

02 — Life at y/cs

More than a club. A crew.

Demo days, launch booths, a black-tie gala, hackathons and late nights in Tsai. This is where Yale's builders find each other.

y/cs members at the YaleIMs launch booth on campus
YaleIMs Launch
First-place team at the MiniMax hackathon
MiniMax Hackathon winners
Four team members presenting at Demo Day
Demo Day
A packed lecture hall at the Visa recruiting event
Visa Recruiting Event
Students working at the OpenAI technical workshop
OpenAI Technical Workshop
Two Catalyst members pointing at their project on a big screen
Catalyst Projects
Members in Santa hats at the holiday Demo Day
Holiday Demo Day
Two members at the y/cs booth at the EC Bazaar
EC Bazaar
Members playing video games at Tsai CITY
Game night at Tsai CITY

03 — Open to all skill levels

Wherever you're starting from, there's a place for you.

No experience required. Whether you've never written a line of code or you've already shipped to production, y/cs meets you where you are and helps you grow.

Catalyst members talking around a table

/catalyst

Learn to build

A semester-long mentorship program. Go from first commit to a deployed portfolio project with an upperclass mentor.

No experience needed · Fall & Spring

Three dev team members smiling at a build night

/dev

Ship real products

Join a product team with a lead, a roadmap and real users. Code review, design crits, launches.

For engineers & designers ready to build

A fireside chat with a guest speaker at Tsai CITY

/community

Meet the industry

Tech talks and recruiting dinners with our sponsors, game nights and socials, and our end-of-year gala.

Every skill level · open to all Yale students

For students

Build with us this semester.

General membership is open year-round.

Apply to join

For companies

Meet Yale's strongest builders.

Tech talks, recruiting events and a direct line to students who already ship production software.

Become a sponsor