Jacob is a lead developer on Let's Encrypt, the free and automated Certificate Authority. He also works on EFF's Encrypt the Web initiative and is a maintainer on the HTTPS Everywhere browser extension.
Prior to working at EFF, Jacob was on Twitter's anti-spam and security teams. One the security team, he implemented HTTPS-by-default with forward secrecy, key pinning, HSTS, and CSP. On anti-spam, he deployed new machine-learned models to detect and block spam in realtime. Before Twitter, he worked at Google, variously on the maps, transit, and shopping teams.