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Handshake AI

AI-data arm of Handshake; sells RL environments through Fireworks AI

Data majorDomain expertsTool useCoding and SWE

Handshake AI, the AI-data division of the Handshake careers platform, began offering RL environments through Fireworks AI’s training platform in November 2026, starting with ATLAS-Finance (100 tasks across 13 investment-banking environments). It published Gandalf the Grader, an in-environment verifier, and acqui-hired Cleanlab in January 2026. Job postings describe an internal RL environments team and "Environment Factory".

Best for: Finance environments available through the Fireworks training platform

~$435M total (parent company)

  • ✓ Bespoke builds
  • ✓ Platform or hub
  • – Open source
  • – Publishes prices
Visit Handshake AI

Facts checked November 9, 2026 against the sources listed below. Handshake AI does not pay to appear here.

1 Legal nameHandshake
2 HeadquartersSan Francisco, CA
3 Founded2013
4 Team200+ researchers and engineers (company-stated)
5 DeliveryBespoke builds, Platform or hub
6 ExclusivityNot disclosed
7 Customers and partnersSays the 8 largest frontier labs train with its datasets, without naming them; partners with Fireworks AI to distribute its RL environments.
8 Published pricesNot disclosed

Worth knowing before you sign

  • Lab relationships are self-claimed and unnamed
  • Lab-facing environment work is documented mainly in job postings
  • Revenue figures are third-party estimates

Go to Handshake AI's site

Sources

  1. Handshake: Fireworks partnership
  2. Handshake AI research
  3. Handshake AI enterprise page
  4. RL environments job posting
  5. Sacra profile
  6. TechCrunch: Cleanlab acquisition
  7. Epoch AI: RL environments FAQ
  8. pavlovslist directory

Work at Handshake AI? Send corrections with a source to editors@toprlenvironments.com. We fix verified errors within five business days.

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