William Barthell
FounderCo-Founder & CTO at Janet AI
San Francisco, California, United States
FoundedJanet AI · YC
Find your path to William
216 people in our graph share verified history with William — schools, employers, funds. One of them is your warm intro.
About
William Barthell is co-founder and CTO at Janet AI. Previously, he was the first engineer at a cryptocurrency startup where he worked on automated market maker design for Solana token trading, and holds a bachelor's degree in computer science from UW-Madison.
Co-Founder & CTO at Janet AIYC S25
Intro paths
William went through Y Combinator (Summer 2025) — any YC alum in your network can reach them through the YC community.
Their group partner at YC was Tyler Bosmeny, General Partner at Y Combinator — the partner who ran Janet AI's batch and knows the company first-hand. YC profile ↗
In turn, William can intro founders to Janet AI's investors below.
Janet AI's investors · 1
Co-founders at Janet AI
Experience
- Janet AI (YC S25)Co-Founder & CTOcurrent2025 — presentSan Francisco, California, United States
- Stealth StartupFounding Engineer2024New York, New York, United States
Frequently asked questions
- Who is William Barthell?
- William Barthell is co-founder and CTO at Janet AI. Previously, he was the first engineer at a cryptocurrency startup where he worked on automated market maker design for Solana token trading, and holds a bachelor's degree in computer science from UW-Madison.
- Where does William Barthell work?
- William Barthell is Co-Founder & CTO of Janet AI.
- What companies did William Barthell found?
- William Barthell founded Janet AI.
- Where did William Barthell go to school?
- William Barthell studied at Y Combinator (S25); University of Wisconsin-Madison (Bachelor's degree, Computer Science); Saratoga High School.
Founder mafias
Y Combinator mafia10,230
Also came through, then founded or led a company.
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Same school
Also attended Y Combinator2,000
+ 1,994 more
Also attended University of Wisconsin-Madison628
+ 622 more
Also attended Saratoga High School31
+ 25 more
Shared employers
Also worked at Janet AI (YC S25)1
Also worked at Stealth Startup485
+ 479 more