As hedge funds have become sophisticated, their talent needs have evolved — and top managers now are searching out people with engineering abilities or data science skills. This has put managers in direct competition with big tech firms, and a years-long battle over talent has ensued. Hedge funds like Two Sigma, Citadel, and Bridgewater have managed to bring in more people from big tech firms over the last ten years than it has lost. Amazon and Microsoft have seen hundreds of people leave their organizations for hedge funds. Visit Business Insider's homepage for more stories.