Founder Directory
Built by Keitoto
Founders7
Known for these resultsRole43%Role is parsed from founder titles in yc.db. Known for 43% 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.School43%School is matched from bios, case-sensitive for acronyms. 43% of these rows have at least one match.
- Satyam Singh@klauscodesFounder/CTO · SimulithicF26B2B · San Francisco
- Andrew TranFounder/CTO · Alkera AIS26B2B · San Francisco
- Nathan H. Leung@nathanhleungFounder/CTO · HarborX26Healthcare · San Francisco
- Daniel BessonovFounder · AvoraF24Healthcare · San Francisco
- Jack MastrangeloFounder · CobblestoneW23Real Estate and Construction · New York
- Jason ScharffFounder · CobblestoneW23Real Estate and Construction · New York
- Karim AtiyehFounder · ParibusS15Fintech · New York
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Satyam SinghSimulithicFounder/CTOFall 2026B2BSan Francisco, United States2https://x.com/klauscodesAndrew TranAlkera AIFounder/CTOSummer 2026B2BSan Francisco, United States3—Nathan H. LeungHarborFounder/CTOSpring 2026HealthcareSan Francisco, United States3https://x.com/nathanhleungDaniel BessonovAvoraFounderFall 2024HealthcareSan Francisco, United States4—Jack MastrangeloCobblestoneFounderWinter 2023Real Estate and ConstructionNew York, United States3—Jason ScharffCobblestoneFounderWinter 2023Real Estate and ConstructionNew York, United States3—Karim AtiyehParibusFounderSummer 2015FintechNew York, United States——
Showing 1–7 of 7 founders
Jason Scharff
Founder·Cobblestone
PRIMARY INFO
RoleFounder· not in title
Team size3
BatchWinter 2023
LocationNew York, United States
Company statusAcquired
StageEarly
BIO
Co-Founder of Cobblestone. Previously Engineering at Ramp and Robinhood.
Ex-company, school and discipline below are derived from this bio. Nothing is inferred when the bio is missing.
BACKGROUND
Credentialsnone mentioned
DisciplineEngineerKeyword match from the bio text, not a classifier.
TRACK RECORD
First YC company on record
COMPANY CONTEXT
CobblestoneDelinquency reduction and automation software for institutional…
IndustryReal Estate and Construction
Websitegetcobblestone.com
Team size3
X—
LocationNew York, United States
BatchWinter 2023
Co-foundersJack Mastrangelo
