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About
Sergey Bunas is a computer science dropout who previously worked as a Senior Software Engineer at Deel. He built Suggesty, a search product launched in 2022, and Stage, a design tool that reached 10K users before joining his current venture.
CTO at 21stYC W26
Intro paths
Sergey went through Y Combinator (Winter 2026) — any YC alum in your network can reach them through the YC community.
Their group partner at YC was Ankit Gupta, General Partner at Y Combinator — the partner who ran 21st's batch and knows the company first-hand. YC profile ↗
In turn, Sergey can intro founders to 21st's investors below.
21st's investors · 15
Co-founders at 21st
Frequently asked questions
- Who is Sergey Bunas?
- Sergey Bunas is a computer science dropout who previously worked as a Senior Software Engineer at Deel. He built Suggesty, a search product launched in 2022, and Stage, a design tool that reached 10K users before joining his current venture.
- Where does Sergey Bunas work?
- Sergey Bunas is CTO of 21st.
- What companies did Sergey Bunas found?
- Sergey Bunas founded 21st.
Founder mafias
Y Combinator mafia10,594
Also came through, then founded or led a company.
Deel mafia18
Also came through, then founded or led a company.
About this profile. Compiled from public sources — 21st's own website and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights