Founder Directory
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Founders6
Known for these resultsRole67%Role is parsed from founder titles in yc.db. Known for 67% 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.Bio100%Bio coverage: 100% 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-company100%Ex-company is matched from bios with employment context (ex-, formerly, worked at). 100% of these rows have at least one match.School50%School is matched from bios, case-sensitive for acronyms. 50% of these rows have at least one match.
- Sergey Bunas@sergeybunasFounder/CTO · 21stW26B2B · San Francisco
- Isabelle Ilyia@isabelleilyiaFounder/CTO · CedarW25B2B · San Francisco
- Akshay SubramaniamFounder/CEO · HaystackS24B2B · New York
- Sneha Sivakumar@sneha8sivakumarFounder/CEO · SpurS24B2B · New York
- Vlad Matsiiako@matsiiakoFounder · InfisicalW23B2B · San Francisco
- Emil Sjölander@emilsjolanderFounder · VislyW19B2B
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Sergey Bunas21stFounder/CTOWinter 2026B2BSan Francisco, United States3https://x.com/sergeybunasIsabelle IlyiaCedarFounder/CTOWinter 2025B2BSan Francisco, United States2https://x.com/isabelleilyiaAkshay SubramaniamHaystackFounder/CEOSummer 2024B2BNew York, United States2—Sneha SivakumarSpurFounder/CEOSummer 2024B2BNew York, United States8https://x.com/sneha8sivakumarVlad MatsiiakoInfisicalFounderWinter 2023B2BSan Francisco, United States50https://x.com/matsiiakoEmil SjölanderVislyFounderWinter 2019B2BUnknown6https://x.com/emilsjolander
Showing 1–6 of 6 founders
Serafim Korablev
Founder/CEO·21st
PRIMARY INFO
RoleFounder/CEO
Team size3
BatchWinter 2026
LocationSan Francisco, United States
Company statusActive
StageEarly
BIO
One of the first full-time vibe-coders (since October 2023). Co-founder of 21st.dev, a UI components registry with over 1m users. Previously co-founded Rork.com (then a web app builder for Next.js), the first Telegram-native memecoin launchpad (multi-million exit), and Via, a cross-chain crypto routing protocol with $1.5B GTV backed by Naval, Safe, Sandeep, and others. Passionate about design and basketball.
Ex-company, school and discipline below are derived from this bio. Nothing is inferred when the bio is missing.
BACKGROUND
No notable employer or school mentioned in the bio.
Credentialsnone mentioned
Disciplinenot detectedKeyword match from the bio text, not a classifier.
TRACK RECORD
Serial founder · self-declared
COMPANY CONTEXT
21stUI building blocks for the agentic internet
Co-foundersSergey Bunas@sergeybunas
