Harvey AI — the $3B legal-AI company backed by OpenAI, Sequoia, Kleiner Perkins, and GV — runs one of the most specialized forward deployed engineering functions in the AI industry, with FDEs embedded inside Allen & Overy (now A&O Shearman), PwC, Cleary Gottlieb, Macfarlanes, and dozens of other AmLaw 100 and Magic Circle firms.