Founder Directory
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Founders2
Known for these resultsRole0%Role is parsed from founder titles in yc.db. Known for 0% 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.School100%School is matched from bios, case-sensitive for acronyms. 100% of these rows have at least one match.
- Peter VajdaFounder · PerfectBit, Inc.X26B2B · San Francisco
- Seiji YamamotoFounder · PerfectBit, Inc.X26B2B · San Francisco
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Peter VajdaPerfectBit, Inc.FounderSpring 2026B2BSan Francisco, United States2—Seiji YamamotoPerfectBit, Inc.FounderSpring 2026B2BSan Francisco, United States2—
Showing 1–2 of 2 founders
Seiji Yamamoto
Founder·PerfectBit, Inc.
PRIMARY INFO
RoleFounder· not in title
Team size2
BatchSpring 2026
LocationSan Francisco, United States
Company statusActive
StageEarly
BIO
Led teams in the Core Llama group at Meta Superintelligence Labs. Senior Staff Research Scientist across 9 years at Meta spanning LLM pre-training and post-training, inference optimization, full-duplex speech models, and computer vision vision models. Before tech: PhD in Physics, published in Proceedings of the National Academy of Sciences and Physical Review Letters, co-authored with Fields Medalist. Educated at Stanford, Rice, Columbia, post-doc at a National Lab.
Ex-company, school and discipline below are derived from this bio. Nothing is inferred when the bio is missing.
BACKGROUND
CredentialsPhD
DisciplineResearcherKeyword match from the bio text, not a classifier.
TRACK RECORD
First YC company on record
COMPANY CONTEXT
PerfectBit, Inc.
Correct by construction AI training data
Co-foundersPeter Vajda
