Tomer London
About Tomer London
Tomer London is a co-founder and the Chief Product Officer of Gusto, the payroll, benefits and HR platform that began as ZenPayroll in the Y Combinator batch of winter 2012. He is responsible for Gusto's product vision. He grew up in Israel and holds a B.S. in Electrical Engineering from the Technion and an M.S. and Ph.D. in Electrical Engineering from Stanford, according to PitchBook. His LinkedIn profile says he left the Stanford PhD program to start ZenPayroll.
Before ZenPayroll he was co-founder and CEO of Vizmo, which built self-service customer support technology for enterprises. Earlier roles listed in investor directories include computer architecture researcher at Intel Research in Israel and product lead on an app at Bump Technologies. He is based in San Francisco.
PitchBook lists Tomer London as an active individual angel with 24 investments, 12 portfolio companies and 9 exits. Its recorded deals run from 2022 to 2026 and are mostly in business software and financial software. Deal sizes and his own check sizes are not disclosed there.
Directories also list earlier backing of Mercury (a Series B in 2021), Amplitude, Retool, Figma and Checkr. They do not give his role or amounts for most of these.
Didit announced on May 26, 2026 that it had raised a $7.5M seed round in total, including a new $6M. The company describes itself as infrastructure for identity and fraud, with one API for KYC, KYB, transaction monitoring and wallet screening. Didit named Tomer London, co-founder of Gusto, among the angels in the round, alongside investors such as Y Combinator and Pioneer Fund.
His other recent deals on PitchBook include Ultrametric (seed, March 2026) and TransCrypts (October 2025). These are in financial and business software, and the listings do not label them as AI deals.
London has not published an investment thesis that we could find. Third-party directories describe him as investing in API, fintech and SaaS companies at pre-seed, seed and Series A, with a focus on the US, Canada and Israel. That description is not from him. His public posts focus on Gusto and small business software, including Gusto's AI teammate product. We found no public check size, so none is given here.
- Didit: identity and fraud infrastructure API; named as an angel in its 2026 seed announcement.
- Ultrametric: financial software; seed round recorded March 2026.
- TransCrypts: business software; deal recorded October 2025.
- Demostack: software company; deal recorded April 2022, in a Series B round.
- Mercury: banking for startups; Series B in 2021.
- Amplitude, Retool, Figma and Checkr: listed as past investments by Boring Business Nerd, with no dates.
- didit.me/blog/didit-7-5m-seed-infrastructure-identity-fraud
- pitchbook.com/profiles/investor/109672-30
- seedtable.com/investors/tomer-london
- linkedin.com/in/tomerlondon
- gusto.com/resources/articles/author/tomer-london
- x.com/tomerlondon
- boringbusinessnerd.com/investor/tomer-london
- startupfundraising.com/investors/tomer-london-5093dd
Investing activity
Tomer London appears in 1 AI deal tracked by the Lounge deals desk. The rounds are mostly Seed, with a median round size of $8M. The most recent is Didit (Seed, $7.5M, May 2026).
Tomer London most often invests alongside Rebel Fund, SaaSholic, Taro Fukuyama and Orange Collective, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Tomer London
Who is Tomer London?
He is a co-founder and Chief Product Officer of Gusto, which began as ZenPayroll at Y Combinator in 2012. He is also an active angel investor based in San Francisco.
Did Tomer London invest in Didit?
Yes. Didit's May 2026 seed announcement names him among its angel investors. The company reported $7.5M raised in total.
What stage does Tomer London invest in?
Third-party directories list pre-seed, seed and Series A. He has not stated this publicly that we could find. His recorded deals include seed rounds in 2025 and 2026.
What is Tomer London's check size?
No check size is public from him or from reliable deal data. PitchBook does not list amounts for his angel deals.
What sectors does Tomer London back?
His recorded deals are mostly in fintech, financial software, business software and APIs. Didit adds identity and fraud infrastructure.
How can founders reach Tomer London?
He is on LinkedIn at linkedin.com/in/tomerlondon and on X as @tomerlondon. We found no personal website.
Is Tomer London an angel investor?
Yes. Tomer London invests personally as an angel.
What AI companies has Tomer London invested in?
Tomer London's AI investments include Didit. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Tomer London invest at?
In the rounds tracked on Lounge, Tomer London has invested at Seed, with a median round of $8M.
Who does Tomer London co-invest with?
Tomer London's most frequent co-investors on Lounge are Rebel Fund (1 deal), SaaSholic (1 deal), Taro Fukuyama (1 deal), Orange Collective (1 deal) and Phosphor Capital (1 deal).