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Y Combinator portfolio Developer tools companies

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

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

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

  1. 1
    Airbnb· San Francisco, California, United States
    • Post-IPO debt
    • 69.2k employees
    • Founded 2007
  2. 2
    Twitch· San Francisco, California, United States
    • Series C
    • 17.5k employees
    • Founded 2011
  3. 3
    Café (YC S21)· New York, New York, United States
    • Pre-seed
    • 12k employees
    • Founded 2020
  4. 4
    HubSpot· Cambridge, Massachusetts, United States
    • 12k employees
    • Founded 2006
  5. 5
    Freshworks· San Mateo, California, United States
    • Secondary
    • 7.4k employees
    • Founded 2010
  6. 6
    Rippling· San Francisco, California, United States
    • Series G
    • 7.2k employees
    • Founded 2016
  7. 7
    Scale AI· San Francisco, California, United States
    • Corporate
    • 6.5k employees
    • Founded 2016
  8. 8
    Gusto· San Francisco, California, United States
    • Series A
    • 4.4k employees
    • Founded 2011
  9. 9
    HackerRank· Cupertino, California, United States
    • Series D
    • 2.1k employees
    • Founded 2012
  10. 10
    Homebase· San Francisco, California, United States
    • Series D
    • 1.8k employees
    • Founded 2014
  11. 11
    Magic· San Francisco, California, United States
    • Series unknown
    • 1.8k employees
    • Founded 2014
  12. 12
    Fivetran· Oakland, California, United States
    • Debt
    • 1.8k employees
    • Founded 2012
  13. 13
    Vanta· San Francisco, California, United States
    • Series D
    • 1.7k employees
    • Founded 2018
  14. 14
    Webflow· San Francisco, California, United States
    • Series unknown
    • 1.7k employees
    • Founded 2013
  15. 15
    Checkr, Inc.· San Francisco, California, United States
    • undisclosed
    • 1.7k employees
    • Founded 2014
  16. 16
    Optimizely· New York, New York, United States
    • Debt
    • 1.6k employees
    • Founded 2010
  17. 17
    6sense· San Francisco, California, United States
    • Debt
    • 1.6k employees
    • Founded 2013
  18. 18
    Podium· Lehi, Utah, United States
    • Series unknown
    • 1.5k employees
    • Founded 2014
  19. 19
    Faire· San Francisco, California, United States
    • Secondary
    • 1.5k employees
    • Founded 2017
  20. 20
    Zapier· San Francisco, California, United States
    • Series unknown
    • 1.4k employees
    • Founded 2011
  21. 21
    PagerDuty· San Francisco, California, United States
    • Post-IPO debt
    • 1.3k employees
    • Founded 2009
  22. 22
    Zip· San Francisco, California, United States
    • Series D
    • 1.2k employees
    • Founded 2020
  23. 23
    Creatio· Boston, Massachusetts, United States
    • Private equity
    • 1.1k employees
    • Founded 2014
  24. 24
    Weave· Lehi, Utah, United States
    • Secondary
    • 1.1k employees
    • Founded 2008
  25. 25
    Jasper· San Francisco, California, United States
    • Series A
    • 1k employees
    • Founded 2020

Y Combinator’s Developer tools portfolio

The list above ranks Y Combinator-backed Developer tools companies by current headcount, drawn from public LinkedIn and Crunchbase records. 1,146 matching companies in our index give you a quick read on where Y Combinator has gone deepest in the Developer tools space.

Y Combinator’s Developer tools bets tend to share a thesis. The engineers, ML researchers, and founders inside these companies are often building the same primitives — and they show up in Developer tools talent pools across the next decade.

Refolk converts this list into a live search. Ask for “Y Combinator Developer toolscompanies hiring senior engineers” or “founders of Y Combinator-backed Developer toolscompanies” and Refolk returns a fresh ranked shortlist.

How this list is built

Refolk pulled Developer tools companies whose disclosed Crunchbase investor list includes Y Combinator, ranked them by current employee count, and kept those with at least 5 employees. The list refreshes once a day.

Last refreshed: Thu, 07 May 2026 06:09:56 GMT

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