Founder Directory
Built by Keitoto
Founders252
Known for these resultsRole41%Role is parsed from founder titles in yc.db. Known for 41% of these rows — the rest have no title at all, mostly 2019–2023. Those rows stay in the result and are counted as Unknown, never as No.Bio85%Bio coverage: 85% of these founders have a bio on their YC profile. Every bio-derived facet (ex-company, school, credentials, discipline) is Unknown for the rest.Ex-company19%Ex-company is matched from bios with employment context (ex-, formerly, worked at). 19% of these rows have at least one match.School27%School is matched from bios, case-sensitive for acronyms. 27% of these rows have at least one match.
- Daniel Martinez@imwi90Founder & Product · Callbook AIS26B2B · San Francisco
- Diego Avellaneda@diego_torres173Founder/CEO · Callbook AIS26B2B · San Francisco
- Lance VickFounder/CTO · CautionS26B2B · George Town
- Joohyun (CJ) ChaFounder/CEO · Dawn IndustriesS26Industrials · San Francisco
- Robin LeeFounder/CTO · Dawn IndustriesS26Industrials · San Francisco
- Dan KomornyFounder/CTO · Earendil RoboticsS26Industrials · San Francisco
- James WaltonFounder/CEO · Earendil RoboticsS26Industrials · San Francisco
- Tien ChuFounder/CTO · LATOS26B2B · San Francisco
- Sanjeev ChauhanFounder/CEO · Synapse SemiconductorS26Industrials · Durham
- Bogdan PyzhFounder/COO · 9 MothersX26Industrials · Austin
- Roman KhomenkoFounder · 9 MothersX26Industrials · Austin
- Russell Smith@rhsFounder/CEO · 9 MothersX26Industrials · Austin
- Erik MeikeFounder/CTO · MadroneX26Industrials · San Francisco
- Leon Iwanowitsch@LeonIwanowitschFounder/CEO · OntoraX26B2B · San Francisco
- Cameron SpillerFounder/CTO · SoriaX26Fintech · New York
- Charles Pan@ceefryingpanFounder/CEO · StageX26B2B · San Francisco
- Dean Stratakos@DeanStratakosFounder/CTO · StageX26B2B · San Francisco
- Sergey Bunas@sergeybunasFounder/CTO · 21stW26B2B · San Francisco
- Mitch Radhuber@MRadhuberFounder/CEO · CorelayerW26B2B · San Francisco
- Shipra JhaFounder/CTO · CorelayerW26B2B · San Francisco
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Daniel MartinezCallbook AIFounder & ProductSummer 2026B2BSan Francisco, United States7https://x.com/imwi90Diego AvellanedaCallbook AIFounder/CEOSummer 2026B2BSan Francisco, United States7https://x.com/diego_torres173Lance VickCautionFounder/CTOSummer 2026B2BGeorge Town, Cayman Islands5—Joohyun (CJ) ChaDawn IndustriesFounder/CEOSummer 2026IndustrialsSan Francisco, United States2—Robin LeeDawn IndustriesFounder/CTOSummer 2026IndustrialsSan Francisco, United States2—Dan KomornyEarendil RoboticsFounder/CTOSummer 2026IndustrialsSan Francisco, United States7—James WaltonEarendil RoboticsFounder/CEOSummer 2026IndustrialsSan Francisco, United States7—Tien ChuLATOFounder/CTOSummer 2026B2BSan Francisco, United States2—Sanjeev ChauhanSynapse SemiconductorFounder/CEOSummer 2026IndustrialsDurham, United States2—Bogdan Pyzh9 MothersFounder/COOSpring 2026IndustrialsAustin, United States19—Roman Khomenko9 MothersFounderSpring 2026IndustrialsAustin, United States19—Russell Smith9 Mothers2× YCFounder/CEOSpring 2026IndustrialsAustin, United States19https://x.com/rhsErik MeikeMadroneFounder/CTOSpring 2026IndustrialsSan Francisco, United States2—Leon IwanowitschOntoraFounder/CEOSpring 2026B2BSan Francisco, United States3https://x.com/LeonIwanowitschCameron SpillerSoriaFounder/CTOSpring 2026FintechNew York, United States3—Charles PanStageFounder/CEOSpring 2026B2BSan Francisco, United States2https://x.com/ceefryingpanDean StratakosStageFounder/CTOSpring 2026B2BSan Francisco, United States2https://x.com/DeanStratakosSergey Bunas21stFounder/CTOWinter 2026B2BSan Francisco, United States3https://x.com/sergeybunasMitch RadhuberCorelayerFounder/CEOWinter 2026B2BSan Francisco, United States3https://x.com/MRadhuberShipra JhaCorelayerFounder/CTOWinter 2026B2BSan Francisco, United States3—
Showing 1–20 of 252 founders
Sergey Bunas
Founder/CTO·21st
PRIMARY INFO
RoleFounder/CTO
Team size3
BatchWinter 2026
LocationSan Francisco, United States
Company statusActive
StageEarly
BIO
CS dropout. Senior Software Engineer at Deel (W19). Built Perplexity before Perplexity (Suggesty, 2022 — #1 Product Hunt, featured in Google's internal newsletter). Solo-built a Figma competitor pre-AI (Stage, 10K users). Cambridge AI hackathon winner (solo)
Ex-company, school and discipline below are derived from this bio. Nothing is inferred when the bio is missing.
BACKGROUND
CredentialsDropout / Thiel
DisciplineEngineerKeyword match from the bio text, not a classifier.
TRACK RECORD
First YC company on record
COMPANY CONTEXT
21stUI building blocks for the agentic internet
Co-foundersSerafim Korablev@serafimcloud
