Founder Directory
Built by Keitoto
Founders3
Known for these resultsRole33%Role is parsed from founder titles in yc.db. Known for 33% 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.School67%School is matched from bios, case-sensitive for acronyms. 67% of these rows have at least one match.
- Jacob Xiao@jacobxFounder · bitrigS25B2B · San Francisco
- Kyle Macomber@kylemacomberFounder/CEO · bitrigS25B2B · San Francisco
- Tim Donnelly@tdonnellyFounder · bitrigS25B2B · San Francisco
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Jacob XiaobitrigFounderSummer 2025B2BSan Francisco, United States3https://x.com/jacobxKyle MacomberbitrigFounder/CEOSummer 2025B2BSan Francisco, United States3https://x.com/kylemacomberTim DonnellybitrigFounderSummer 2025B2BSan Francisco, United States3https://x.com/tdonnelly
Showing 1–3 of 3 founders
Jacob Xiao
Founder·bitrig
PRIMARY INFO
RoleFounder· not in title
Team size3
BatchSummer 2025
LocationSan Francisco, United States
Company statusActive
StageEarly
BIO
Jacob is a co-founder of bitrig. Before bitrig, Jacob spent 15 years at Apple, where he co-created and led the development of SwiftUI. He also contributed to Xcode and UIKit during his time there. Prior to Apple, Jacob built Opacity, a graphical design tool.
Ex-company, school and discipline below are derived from this bio. Nothing is inferred when the bio is missing.
BACKGROUND
Credentialsnone mentioned
Disciplinenot detectedKeyword match from the bio text, not a classifier.
TRACK RECORD
First YC company on record
COMPANY CONTEXT
bitrigVibe code, test, and deploy Swift apps. All from your iPhone.
