# Thomas (Tom) Sun

> Thomas (Tom) Sun is the CEO and co-founder of AmpUp, an electric vehicle charging software company founded in 2018 and part of Y Combinator’s Winter 2019 batch. A former engineer at companies including Twitter and Yahoo, he helped develop AmpUp from a shared-charger app into software for workplaces, residential properties, campuses, and fleets. His work centers on charging access, reliable operations, hardware flexibility, and energy management.

- **Role:** CEO and co-founder at AmpUp
- **Organizations:** AmpUp, Twitter, Yahoo, ADATAO, Jump Trading, Goldman Sachs, Y Combinator
- **Education:** B.S., Electrical Engineering, University of Illinois Urbana-Champaign, Y Combinator, Y Combinator Startup School
- **Known for:** Co-founded AmpUp in 2018 and led it through Y Combinator Winter 2019., Led AmpUp through its $15 million Series A in 2024., AmpUp reported more than 700% subscription revenue growth over the two years preceding its 2024 funding announcement.

## Career timeline

- **2010** — Software engineering internship at Jump Trading.
- **2011-2012** — Analyst at Goldman Sachs.
- **2012-2013** — Software engineer at Jump Trading.
- **2013-2015** — Software development engineer at Yahoo.
- **2015** — Machine learning software engineer at ADATAO.
- **2015-2018** — Software engineer at Twitter; became a senior software engineer in 2017. Sun described leaving around the end of 2017; employment listings end in January 2018.
- **2018** — Co-founded AmpUp to address EV charging access.
- **2019** — AmpUp participated in Y Combinator Winter 2019.
- **2020** — AmpUp launched Community Manager in March; received funding from investors including SAIC Motor and Hyundai.
- **2021** — AmpUp secured additional capital from Goodyear, Foothill Ventures, and TechNexus; Powerhouse Ventures also invested in its seed round.
- **2024** — AmpUp raised a $15 million Series A led by Touchdown Ventures.
- **2025** — AmpUp announced a fleet charging partnership with Roundtrip EV.
- **2026** — AmpUp announced KlooBot remote diagnostics, a five-brand CTEP-certified portfolio, and selection of its Connecticut managed-charging pilot to advance toward statewide scale.

## Achievements

- Co-founded AmpUp in 2018 and led it through Y Combinator Winter 2019.
- Led AmpUp through its $15 million Series A in 2024.
- AmpUp reported more than 700% subscription revenue growth over the two years preceding its 2024 funding announcement.
- AmpUp reported serving more than 2,500 customers across 75 North American markets in 2026.
- AmpUp’s Adapt & Earn was selected to advance toward statewide scale in Connecticut in 2026.

## Latest updates

- **2026-07** — AmpUp announced that Connecticut PURA selected Adapt & Earn to advance toward statewide deployment; a joint statewide program proposal with utilities was the next step.
- **2026-05** — AmpUp announced CTEP-certified Level 2 charging support across five manufacturer brands.
- **2026-04** — AmpUp began a phased rollout of KlooBot diagnostics to PRO subscribers.
- **2025-03** — AmpUp announced its partnership with Roundtrip EV for depot-based fleet electrification.

## Links

- Website: https://www.ampup.io/
- LinkedIn: https://www.linkedin.com/in/ts-ampup

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Profile page: https://yespress.io/tom-sun
Published by YesPress — https://yespress.io
Last updated: 2026-10-25