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Series B Developer tools companies in London

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

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

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

  1. 1
    Tripledot Studios· London, England, United Kingdom
    • Series B
    • 535 employees
    • Founded 2017
  2. 2
    Lavanda· London, England, United Kingdom
    • Series B
    • 329 employees
    • Founded 2014
  3. 3
    Mimica· London, England, United Kingdom
    • Series B
    • 261 employees
    • Founded 2018
  4. 4
    Accurx· London, England, United Kingdom
    • Series B
    • 258 employees
    • Founded 2016
  5. 5
    hyperexponential· London, England, United Kingdom
    • Series B
    • 242 employees
    • Founded 2017
  6. 6
    PhysicsX· London, England, United Kingdom
    • Series B
    • 242 employees
    • Founded 2019
  7. 7
    FintechOS· London, England, United Kingdom
    • Series B
    • 222 employees
    • Founded 2017
  8. 8
    Sona (getsona.com)· London, England, United Kingdom
    • Series B
    • 180 employees
    • Founded 2021
  9. 9
    Xelix· London, England, United Kingdom
    • Series B
    • 169 employees
    • Founded 2018
  10. 10
    Attio· London, England, United Kingdom
    • Series B
    • 167 employees
    • Founded 2019
  11. 11
    Qargo TMS· London, England, United Kingdom
    • Series B
    • 160 employees
    • Founded 2020
  12. 12
    inforcer· London, England, United Kingdom
    • Series B
    • 158 employees
    • Founded 2022
  13. 13
    Cenevo (Formerly Labguru & Titian Software)· London, England, United Kingdom
    • Series B
    • 150 employees
    • Founded 2007
  14. 14
    Disperse· London Colney, England, United Kingdom
    • Series B
    • 143 employees
    • Founded 2015
  15. 15
    Scoro· London, England, United Kingdom
    • Series B
    • 143 employees
    • Founded 2013
  16. 16
    Raft· London, England, United Kingdom
    • Series B
    • 143 employees
    • Founded 2017
  17. 17
    Tyk· London, England, United Kingdom
    • Series B
    • 138 employees
    • Founded 2015
  18. 18
    Causaly· London, England, United Kingdom
    • Series B
    • 134 employees
    • Founded 2018
  19. 19
    Cytora· London, England, United Kingdom
    • Series B
    • 133 employees
    • Founded 2014
  20. 20
    Semble· London, England, United Kingdom
    • Series B
    • 130 employees
    • Founded 2017
  21. 21
    Aztec· London, England, United Kingdom
    • Series B
    • 119 employees
    • Founded 2017
  22. 22
    HICX· London, England, United Kingdom
    • Series B
    • 119 employees
    • Founded 2004
  23. 23
    hackajob· London, England, United Kingdom
    • Series B
    • 118 employees
    • Founded 2014
  24. 24
    SteelEye· London, England, United Kingdom
    • Series B
    • 117 employees
    • Founded 2017
  25. 25
    Definely· London, England, United Kingdom
    • Series B
    • 117 employees
    • Founded 2017

Find engineers at Series B Developer tools companies in London

Searching for “engineers at top Series B Developer tools companies in London” surfaces this slice of the market. The list above ranks Developer tools companies headquartered in London whose latest disclosed round is Series B, by current headcount, drawn from public LinkedIn and Crunchbase records. With 58 matching companies in our index, this is a tight read on where the Developer tools talent in London is heating up.

Three filters at once narrows the field hard. The companies that survive all three — Series B, Developer tools, in London — 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 London hiring” or “founders of Series B Developer tools companies in London 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 London 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 07:56:38 GMT

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