Founder Directory
Built by Keitoto
Founders11
Known for these resultsRole36%Role is parsed from founder titles in yc.db. Known for 36% 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.Bio91%Bio coverage: 91% 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-company18%Ex-company is matched from bios with employment context (ex-, formerly, worked at). 18% of these rows have at least one match.School18%School is matched from bios, case-sensitive for acronyms. 18% of these rows have at least one match.
- Michael MasonFounder/CTO · RuvoS25Fintech · São Paulo
- Mason Landon SmithFounder/CPO · Pave RoboticsW25Industrials · San Francisco
- Mason Pierce@mlpierce22Founder/CTO · TrainLoopW25B2B · San Francisco
- Mason ChilmonczykFounder · Andson BiotechW22Healthcare · Atlanta
- Curtis MasonFounder · GovDashW22Government · New York
- Mason MeierFounder · PursuitW22Real Estate and Construction · Denver
- Andrew MasonFounder · PallaS21Fintech
- Jimmy Liu@jimmyliuFounder · MuddyS19B2B · San Francisco
- Ron Bhattacharyay@aranibattaFounder · MuddyS19B2B · San Francisco
- Sachin Kesiraju@_sachinkFounder · MuddyS19B2B · San Francisco
- Jim Xiao@jimxmeterFounder/President · MasonW16B2B · Seattle
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Michael MasonRuvoFounder/CTOSummer 2025FintechSão Paulo, Brazil11—Mason Landon SmithPave RoboticsFounder/CPOWinter 2025IndustrialsSan Francisco, United States3—Mason PierceTrainLoopFounder/CTOWinter 2025B2BSan Francisco, United States6https://x.com/mlpierce22Mason ChilmonczykAndson BiotechFounderWinter 2022HealthcareAtlanta, United States4—Curtis MasonGovDashFounderWinter 2022GovernmentNew York, United States56—Mason MeierPursuitFounderWinter 2022Real Estate and ConstructionDenver, United States4—Andrew MasonPallaFounderSummer 2021FintechUnknown22—Jimmy LiuMuddyFounderSummer 2019B2BSan Francisco, United States6https://x.com/jimmyliuRon BhattacharyayMuddyFounderSummer 2019B2BSan Francisco, United States6https://x.com/aranibattaSachin KesirajuMuddyFounderSummer 2019B2BSan Francisco, United States6https://x.com/_sachinkJim XiaoMasonFounder/PresidentWinter 2016B2BSeattle, United States65https://x.com/jimxmeter
Showing 1–11 of 11 founders
Mason Pierce
Founder/CTO·TrainLoop
PRIMARY INFO
RoleFounder/CTO
Team size6
BatchWinter 2025
LocationSan Francisco, United States
Company statusActive
StageEarly
BIO
My background is in applying AI models to business use-cases and have always found fine-tuning to be way harder than it should be - My mission is to unlock fine-tuning for all builders :)
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
First YC company on record
COMPANY CONTEXT
TrainLoopReasoning Fine-Tuning
Co-foundersJackson Stokes
