At Facebook, he is the tech lead for the Messages product's storage team and works primarily on HBase internals. He was also responsible for creating XHProf, a light weight PHP profiler (now open source), and XHProfLive, Facebook's real-time function-level performance monitoring system built on top of XHProf. Prior to joining Facebook, he worked in the PL/SQL Compiler and Virtual Machine group in Oracle's database server team.