# Spencer Mateega

> Spencer Mateega is the 23-year-old Co-Founder and CEO of AfterQuery, a San Francisco-based applied research lab that captures expert professional knowledge and converts it into high-quality training data for AI foundation models. Founded in January 2025 and backed by Y Combinator's Winter 2025 cohort, AfterQuery raised a $30 million Series A at a $300 million valuation in April 2026, with revenues exceeding $100 million annualized. Mateega's philosophy — 'We teach machines how experts think' — drives a platform connecting roughly 100,000 domain professionals in finance, legal, and software to frontier AI labs hungry for reasoning-rich data.

- **Role:** Co-Founder and CEO at AfterQuery
- **Organizations:** AfterQuery, Y Combinator
- **From:** Minneapolis area, Minnesota, United States
- **Nationality:** American
- **Education:** Bachelor of Science, Finance and Statistics, University of Pennsylvania - The Wharton School, Master of Science, Computer Science, University of Pennsylvania, High School Diploma, Wayzata High School
- **Known for:** Built AfterQuery to $100M+ annualized revenue run rate within approximately one year of founding, Raised $30M Series A at $300M valuation at age 23, Sole global summer analyst selected at Silver Lake, a top-tier technology private equity firm

## Career timeline

- **2017** — Joined Twitter/X in November 2017
- **~2018-2020** — Co-founded a startup with Danny Tang during high school; successfully exited/sold it
- **~2021** — Google Software Engineer Intern
- **~2022** — Meta Software Engineer Intern
- **~2022** — Morgan Stanley Technology Investment Banking Analyst
- **~2023** — Silver Lake Technology Private Equity Summer Analyst (sole global summer analyst selected)
- **January 2025** — Co-founded AfterQuery with Carlos Georgescu and Danny Tang
- **Early 2025** — AfterQuery accepted into Y Combinator Winter 2025 cohort
- **2025** — AfterQuery reaches $6.5M revenue with 59-person team
- **April 2026** — AfterQuery raises $30M Series A led by Altos Ventures at $300M valuation
- **April 2026** — AfterQuery surpasses $100M annualized revenue run rate with 120+ employees

## Achievements

- Built AfterQuery to $100M+ annualized revenue run rate within approximately one year of founding
- Raised $30M Series A at $300M valuation at age 23
- Sole global summer analyst selected at Silver Lake, a top-tier technology private equity firm
- Y Combinator Winter 2025 cohort company
- Grew AfterQuery to 120+ employees in approximately 15 months
- Successfully exited a startup co-founded during high school
- Dual degree from University of Pennsylvania: BS Finance/Statistics (Wharton) + MS Computer Science

## Latest updates

- **2026-04** — AfterQuery announces $30M Series A at $300M valuation, led by Altos Ventures with participation from The Raine Group, Y Combinator, and BoxGroup
- **2026-04** — AfterQuery surpasses $100M annualized revenue run rate with 120+ employees

## Links

- Website: https://mateega.com
- LinkedIn: https://www.linkedin.com/in/spencermateega
- Twitter/X: https://x.com/spencermateega
- GitHub: https://github.com/mateega
- Instagram: https://www.instagram.com/spencermateega

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Profile page: https://yespress.io/spencer-mateega
Published by YesPress — https://yespress.io
Last updated: 2026-05-22