Mahyad Ghassemi
FounderFounder at Okibi · Founder / CEO at SigmaOS
San Francisco, California, United States
FoundedOkibi · YCSigmaOS · YC
About
Mahyad Ghassemi is a two-time Y Combinator founder who previously built SigmaOS, a web browser designed for AI agent workflows that reached over 100,000 users. He currently develops tools for creating AI coworkers through natural language interfaces.
Founder at OkibiYC S25
Intro paths
Mahyad 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 Gustaf Alstromer — the partner who ran Okibi's batch and knows the company first-hand. YC profile ↗
In turn, Mahyad can intro founders to Okibi's investors below.
Okibi's investors · 2
Co-founders at Okibi
Founder / CEO at SigmaOSYC S21
Intro paths
Mahyad went through Y Combinator (Summer 2021) — any YC alum in your network can reach them through the YC community.
Their group partner at YC was Gustaf Alstromer — the partner who ran SigmaOS's batch and knows the company first-hand. YC profile ↗
In turn, Mahyad can intro founders to SigmaOS's investors below.
SigmaOS's investors · 4
Co-founders at SigmaOS
Experience
- OkibiFoundercurrent2025 — presentSan Francisco Bay Area
- SigmaOSFounder / CEOcurrent2021 — presentGreater London, England, United Kingdom
- AntlerEntrepreneur2020Greater London, England, United Kingdom
- Google DevelopersStudent Clubs Lead2019 — 2020Greater London, England, United Kingdom
- ComposeSenior Full stack Software Engineer2019 — 2020London
- KCL Tech SocietyPresident2017 — 2019Greater London, England, United Kingdom
- LoopLead iOS Software Engineer2018 — 2019London Area, United Kingdom
- MementoiOS Software Engineer2018Greater London, England, United Kingdom
- Sisarv Marcom AgencyFull Stack Software Engineer2016 — 2018Tehran Province, Iran
Skills & more
Languages English · German · Persian
From Mahyad's professional profile.
Frequently asked questions
- Who is Mahyad Ghassemi?
- Mahyad Ghassemi is a two-time Y Combinator founder who previously built SigmaOS, a web browser designed for AI agent workflows that reached over 100,000 users. He currently develops tools for creating AI coworkers through natural language interfaces.
- Where does Mahyad Ghassemi work?
- Mahyad Ghassemi is Founder of Okibi and Founder / CEO at SigmaOS.
- What companies did Mahyad Ghassemi found?
- Mahyad Ghassemi founded Okibi, SigmaOS.
- Where did Mahyad Ghassemi go to school?
- Mahyad Ghassemi studied at Y Combinator; King's College London (Bachelor's degree, Computer Science with a year in industry); Startup School Online.
Founder mafias
Y Combinator mafia8,773
Also came through, then founded or led a company.
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Y Combinator mafia4,716
Also came through, then founded or led a company.
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King's College London mafia51
Also came through, then founded or led a company.
+ 44 more
Startup School Online mafia7
Also came through, then founded or led a company.
SigmaOS mafia3
Also came through, then founded or led a company.
Same school
Also attended Y Combinator2,000
+ 1,994 more
Also attended King's College London233
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