I worked with Igalia's Compiler team on 32-bit support (ARMv7 and MIPS backends) in JavaScriptCore

I worked on HHVM, (hhvm.com) improving performance, developer tooling, and the Hack language

Laid groundwork and lead implementation of PHP7 frontend for HHVM; integrating the Zend PHP7.x parser with a code generator compatible with HHVM's bytecode format and runtime.