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Top Developer tools companies in London

IDEs, runtimes, frameworks, and platforms built primarily for engineers. Filtered to companies headquartered in London.

Built from a search like: “Top Developer tools companies in London”

Ranked by current headcount across Developer tools companies headquartered in London. Refreshed daily.

  1. 1
    Edutech· Greater London, England, United Kingdom
    • 25.2k employees
  2. 2
    Tight and Muslim· London, England, United Kingdom
    • 15.5k employees
  3. 3
    Deliveroo· London, England, United Kingdom
    • Post-IPO equity
    • 10.4k employees
    • Founded 2013
  4. 4
    Game Developer· London, England, United Kingdom
    • 8.8k employees
    • Founded 2015
  5. 5
    Dentist AI· London, England, United Kingdom
    • 6.8k employees
  6. 6
    Travel AI· London, England, United Kingdom
    • 6.3k employees
    • Founded 2022
  7. 7
    FinTech Foundry· London, England, United Kingdom
    • 6.1k employees
  8. 8
    ION· London, England, United Kingdom
    • 5.7k employees
    • Founded 1998
  9. 9
    Shopify Developer· London, England, United Kingdom
    • 5.5k employees
  10. 10
    HealthTech· London, England, United Kingdom
    • 4.5k employees
  11. 11
    Simulation AI· London, England, United Kingdom
    • 4k employees
  12. 12
    Depop· London, England, United Kingdom
    • non equity assistance
    • 3.9k employees
    • Founded 2011
  13. 13
    Playtech· London, England, United Kingdom
    • Post-IPO debt
    • 3.7k employees
    • Founded 1999
  14. 14
    Trip AI· Greater London, England, United Kingdom
    • 3.6k employees
  15. 15
    Healthcare AI· London, England, United Kingdom
    • Seed
    • 3.4k employees
    • Founded 2024
  16. 16
    Ecology AI· Greater London, England, United Kingdom
    • 3.4k employees
  17. 17
    Civica· London, England, United Kingdom
    • 3.1k employees
    • Founded 2001
  18. 18
    Medical Practice· London, England, United Kingdom
    • 3.1k employees
  19. 19
    Salesforce Developer· Greater London, England, United Kingdom
    • 3k employees
  20. 20
    Side· London, England, United Kingdom
    • 3k employees
    • Founded 2009
  21. 21
    Genius Sports· London, England, United Kingdom
    • Post-IPO equity
    • 3k employees
    • Founded 2001
  22. 22
    Support AI· London, England, United Kingdom
    • 2.9k employees
  23. 23
    Restaurant Marketing Agency· Greater London, England, United Kingdom
    • 2.9k employees
  24. 24
    NIM Developer· Greater London, England, United Kingdom
    • 2.8k employees
  25. 25
    David Guden· London, England, United Kingdom
    • 2.8k employees

Find engineers at Developer tools companies in London

London has long been a hub for Developer tools, and the list above ranks the largest Developer tools companies headquartered there by current headcount, drawn from public LinkedIn and Crunchbase records. With 2,700 matching companies in our index, this is a good map of where the Developer tools talent in Londonlives — useful whether you’re recruiting, partnering, or sizing a market.

The biggest Developer tools companies in London tend to be the gravitational centres for specialised talent — senior engineers, ML researchers, applied scientists, designers — while the smaller ones compete on speed, equity, and proximity to founders.

Refolk converts this list into a live search. Ask for “Developer tools engineers in Londonhiring senior staff” or “founders of Developer tools companies in Londonwho left in the last 12 months” and Refolk returns a ranked shortlist with the evidence that earned each person a spot.

How this list is built

Refolk pulled Developer tools companies headquartered in London from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 10 employees. The list refreshes once a day.

Last refreshed: Thu, 07 May 2026 06:51:10 GMT

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