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.
Founder at 21stYC W26
Intro paths
YC
Sergey went through Y Combinator (Winter 2026) — any YC alum in your network can reach them through the YC community.
GP
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 ↗
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In turn, Sergey can intro founders to 21st's investors below.
21st's investors · 2
Co-founders at 21st
SK
Serafim KorablevCEO / co-founder
Experience
- 21stCo-Foundercurrent2025 — presentSan Francisco Bay Area
- DeelPlatform Architect2022 — 2023London Area, United Kingdom
- SuggestyFounder2022London Area, United Kingdom
- StageCo-Founder, CTO2021 — 2022
- RocketbankSoftware Engineer2019 — 2021
Skills & more
Shipping
From Sergey's professional profile.
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 Founder of 21st.
- What companies did Sergey Bunas found?
- Sergey Bunas founded 21st.
- Where did Sergey Bunas go to school?
- Sergey Bunas studied at Y Combinator (YC W26).
Founder mafias
Y Combinator mafia8,773
Also came through, then founded or led a company.
Sam AltmanPresidentFounded Tools for Humanity +3Jessica LivingstonCo-founderFounded Y CombinatorAlexis OhanianYC Summer 2005Founded RedditFred EhrsamYC Summer 2012Founded Nudge +1Matt HuangYC Winter 2011Founded HotspotsTrae StephensYC Winter 2022Founded Pursuit +1
+ 8,766 more
Y Combinator mafia4,716
Also came through, then founded or led a company.
Ryan SheaEntrepreneurshipFounded StacksTarek MansourFounded KalshiSuhail DoshiEating beans & riceFounded Playground +1Subomi OluwalanaW22Founded ConvoyDarius "Bubs" MonsefS19Founded Sightbox +3Matthew ScholzFounded Oisin Biotechnologies +3
+ 4,709 more
Same school
Also attended Y Combinator2,000
Tarek MansourCo-founder & CEO of KalshiSuhail DoshiFounder of Mixpanel; founder of ParticleSubomi OluwalanaCo-founder & CEO of ConvoyMaroof AhmedFounder at Octopus VenturesJustin SwartPartner at Bitkraft Esports VenturesCollin WallaceGeneral Partner at Lobby Capital
+ 1,994 more
