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.Bio86%Bio coverage: 86% 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-company0%Ex-company is matched from bios with employment context (ex-, formerly, worked at). 0% of these rows have at least one match.School29%School is matched from bios, case-sensitive for acronyms. 29% of these rows have at least one match.
- Jose ToscanoFounder/CTO · Boom AIF25B2B · San Francisco
- Juan CasianFounder/CEO · Boom AIF25B2B · San Francisco
- Sergio GarciaFounder · Boom AIF25B2B · San Francisco
- Sebastian Crossa@sebcrossaFounder · LLM StatsS25B2B · New York
- Alejandro ChavezFounder · AtratoW21Fintech · Mexico City
- Juan CasianEx-CEO & Co-founder (Previously CTO) · AtratoW21Fintech · Mexico City
- Roger Rea@rogereurFounder · AtratoW21Fintech · Mexico City
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Jose ToscanoBoom AIFounder/CTOFall 2025B2BSan Francisco, United States3—Juan CasianBoom AI2× YCFounder/CEOFall 2025B2BSan Francisco, United States3—Sergio GarciaBoom AIFounderFall 2025B2BSan Francisco, United States3—Sebastian CrossaLLM StatsFounderSummer 2025B2BNew York, United States2https://x.com/sebcrossaAlejandro ChavezAtratoFounderWinter 2021FintechMexico City, Mexico80—Juan CasianAtrato2× YCEx-CEO & Co-founder (Previously CTO)Winter 2021FintechMexico City, Mexico80—Roger ReaAtratoFounderWinter 2021FintechMexico City, Mexico80https://x.com/rogereur
Showing 1–7 of 7 founders
Sebastian Crossa
Founder·LLM Stats
PRIMARY INFO
RoleFounder· not in title
Team size2
BatchSummer 2025
LocationNew York, United States
Company statusActive
StageEarly
BIO
Co-Founder @ LLM Stats. Previous founding engineer at Micro building the future of email (backed by a16z), as well as founding engineer at Atrato Pago (W21). Formerly built and scaled Minecraft servers during my spare time during highschool.
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
DisciplineEngineerKeyword match from the bio text, not a classifier.
TRACK RECORD
First YC company on record
COMPANY CONTEXT
LLM StatsIndependent AI evaluations lab
Co-foundersJonathan Chávez@pirchavez
