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Top Developer tools companies

IDEs, runtimes, frameworks, and platforms built primarily for engineers.

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Ranked by current headcount across the largest Developer tools companies. Refreshed daily.

  1. 1
    Amazon· Seattle, Washington, United States
    • Grant
    • 761.9k employees
    • Founded 1994
  2. 2
    Google· Mountain View, California, United States
    • Series unknown
    • 304.7k employees
  3. 3
    Microsoft· Redmond, Washington, United States
    • Post-IPO equity
    • 232.3k employees
    • Founded 1975
  4. 4
    Fiverr· New York, Iowa, United States
    • Series E
    • 212.4k employees
    • Founded 2010
  5. 5
    Upwork· San Francisco, California, United States
    • Series unknown
    • 170.3k employees
    • Founded 2015
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Find engineers and designers at top Developer tools companies

The Developer tools industry runs on the people who build it. The list above ranks the largest Developer tools companies by current headcount, drawn from public LinkedIn and Crunchbase records. Across the 46,486 Developer toolscompanies in our index, you’ll find software engineers, ML researchers, designers, founders, and recruiters worth talking to - whether you’re hiring, investing, or doing market research.

Each company on the list is a hub of talent. The biggest Developer tools companies tend to attract specialised engineers, while younger ones run on small founding teams and hire generalists. Looking at headcount, last funding round, and HQ location side by side gives you a quick read on where the talent density is highest.

Refolk turns this list into a search. Ask for “Developer toolsengineers in San Francisco hiring senior ML” or “designers at Developer toolscompanies who shipped a product in 2025” and Refolk returns a fresh ranked shortlist with the sources that earned each person a spot.

How this list is built

Refolk pulled the largest companies in Developer tools from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 25 employees. The list refreshes once a day.

Last refreshed: Sun, 21 Jun 2026 08:14:25 GMT

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