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Series B Developer tools companies in San Francisco

IDEs, runtimes, frameworks, and platforms built primarily for engineers. Filtered to Series B-stage companies headquartered in San Francisco.

Built from a search like: “Top Series B Developer tools companies in San Francisco”

Ranked by current headcount across Series B Developer tools companies in San Francisco. Refreshed daily.

  1. 1
    Railway· San Francisco, California, United States
    • Series B
    • 10.7k employees
    • Founded 2020
  2. 2
    GitHub· San Francisco, California, United States
    • Series B
    • 6k employees
    • Founded 2008
  3. 3
    Constructor· San Francisco, California, United States
    • Series B
    • 1.3k employees
    • Founded 2015
  4. 4
    Factory· San Francisco, California, United States
    • Series B
    • 1.1k employees
    • Founded 2023
  5. 5
    Incode· San Francisco, California, United States
    • Series B
    • 628 employees
    • Founded 2015
  6. 6
    11x· San Francisco, California, United States
    • Series B
    • 558 employees
    • Founded 2023
  7. 7
    Fay Nutrition· San Francisco, California, United States
    • Series B
    • 463 employees
    • Founded 2022
  8. 8
    Simetrik· San Francisco, Meta, Colombia
    • Series B
    • 415 employees
    • Founded 2017
  9. 9
    Snappr· San Francisco, California, United States
    • Series B
    • 401 employees
    • Founded 2017
  10. 10
    Nooks· San Francisco, California, United States
    • Series B
    • 373 employees
    • Founded 2020
  11. 11
    Proper AI· San Francisco, California, United States
    • Series B
    • 357 employees
    • Founded 2017
  12. 12
    0x· San Francisco, California, United States
    • Series B
    • 347 employees
    • Founded 2016
  13. 13
    AnyRoad· San Francisco, California, United States
    • Series B
    • 341 employees
    • Founded 2014
  14. 14
    Clever Inc.· San Francisco, California, United States
    • Series B
    • 340 employees
    • Founded 2012
  15. 15
    Together AI· San Francisco, California, United States
    • Series B
    • 340 employees
    • Founded 2022
  16. 16
    Poolside· San Francisco, California, United States
    • Series B
    • 319 employees
    • Founded 2023
  17. 17
    SuperAnnotate· San Francisco, California, United States
    • Series B
    • 317 employees
    • Founded 2018
  18. 18
    Simfoni· San Francisco, California, United States
    • Series B
    • 308 employees
    • Founded 2015
  19. 19
    Gamma· San Francisco, California, United States
    • Series B
    • 303 employees
    • Founded 2020
  20. 20
    Nanonets· San Francisco, California, United States
    • Series B
    • 289 employees
    • Founded 2017
  21. 21
    Linden Lab· San Francisco, California, United States
    • Series B
    • 287 employees
    • Founded 1999
  22. 22
    Roofr· San Francisco, California, United States
    • Series B
    • 285 employees
    • Founded 2015
  23. 23
    Reforge· San Francisco, California, United States
    • Series B
    • 279 employees
    • Founded 2016
  24. 24
    Leena AI· San Francisco, California, United States
    • Series B
    • 276 employees
    • Founded 2018
  25. 25
    MetaMap· San Francisco, California, United States
    • Series B
    • 265 employees
    • Founded 2017

Find engineers at Series B Developer tools companies in San Francisco

Searching for “engineers at top Series B Developer tools companies in San Francisco” surfaces this slice of the market. The list above ranks Developer tools companies headquartered in San Francisco whose latest disclosed round is Series B, by current headcount, drawn from public LinkedIn and Crunchbase records. With 215 matching companies in our index, this is a tight read on where the Developer tools talent in San Francisco is heating up.

Three filters at once narrows the field hard. The companies that survive all three — Series B, Developer tools, in San Francisco — are usually the most targeted recruiting pool a hiring manager can ask for. Senior engineers, founding designers, and product leads here are about to become Developer tools’s next operators and angel investors.

Refolk converts this list into a live search. Ask for “senior engineers at Series B Developer tools companies in San Francisco hiring” or “founders of Series B Developer tools companies in San Francisco who left in the last year” and Refolk returns a ranked shortlist with the evidence behind each match.

How this list is built

Refolk pulled Developer tools companies headquartered in San Francisco whose latest disclosed funding round is Series B from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 3 employees. The list refreshes once a day.

Last refreshed: Thu, 07 May 2026 06:51:05 GMT

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