Xin Ding is the cofounder and CEO of Attune (YC X25), a San Francisco startup building blazingly fast, drop-in build tools that speed up compilation without any migration effort. After more than a decade shaping developer-tools products - as Head of Product at FOSSA and VP of Product at Teleport, where he helped scale the company to unicorn status - he teamed up with longtime colleague Eliza Zhang to attack one of the least glamorous but most universal engineering headaches: slow builds. Attune's first product lets Rust developers prefix an existing command with 'hurry' to get dramatically faster builds through distributed caching, remote execution, and compiler-native optimizations.

Aaron Williams is CEO of FOSSA, the San Francisco software supply chain risk management company that watches the open source dependencies inside enterprise code. He arrived in 2022 as VP of Marketing, was promoted to CMO, and stepped into the top job when founder Kevin Wang moved to Chairman. Two Case Western degrees, twenty-plus years of developer marketing at Sun Microsystems, D2iQ, OmniSci, HEAVY.ai and Civis Analytics, and a long habit of building technical communities around tools engineers actually use.