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Y Combinator Developer tools portfolio in San Francisco

The most prolific seed accelerator in the world, batch class twice a year. Filtered to Developer tools companies headquartered in San Francisco.

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Built from a search like: “Y Combinator-backed Developer tools companies in San Francisco”

Ranked by current headcount across Y Combinator-backed Developer tools companies in San Francisco. Refreshed daily.

  1. 1
    DoorDash· San Francisco, California, United States
    • Post-IPO debt
    • 80.7k employees
    • Founded 2013
  2. 2
    Airbnb· San Francisco, California, United States
    • Post-IPO debt
    • 68.6k employees
    • Founded 2007
  3. 3
    Instacart· San Francisco, California, United States
    • Private equity
    • 24.8k employees
    • Founded 2012
  4. 4
    Twitch· San Francisco, California, United States
    • Series C
    • 14.7k employees
    • Founded 2011
  5. 5
    Rippling· San Francisco, California, United States
    • Series G
    • 7.6k employees
    • Founded 2016
Reveal 628 more·100 free credits, no card

Y Combinator-backed Developer tools companies in San Francisco

The list above ranks Y Combinator-backed Developer tools companies headquartered in San Francisco by current headcount, drawn from public LinkedIn and Crunchbase records. With 633 matching companies in our index, you can see exactly where Y Combinator’s Developer tools thesis has landed in San Francisco.

Three filters - investor, industry, city - narrow the field to a tight cluster of operators with overlapping incentives. They share a thesis, a network, and a market. Hiring from this list usually means hiring someone already inside the Y Combinator Developer tools world in San Francisco.

Refolk converts this list into a live search. Ask for “Y Combinator Developer tools companies in San Franciscohiring senior engineers” or “founders of Y Combinator-backed Developer tools companies in San Francisco who left in the last year” and Refolk returns a ranked shortlist.

How this list is built

Refolk pulled Developer tools companies headquartered in San Francisco whose disclosed Crunchbase investor list includes Y Combinator, ranked them by current employee count, and kept those with at least 3 employees. The list refreshes once a day.

Last refreshed: Sun, 21 Jun 2026 09:35:31 GMT

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