IEG 1996-1997 (high traffic, image processing, CGI, SRE stuff)Amazon 1997-2004 (supply chain, product catalog, website engine, service frameworks, image processing and serving)
Apple 2005-2006 (product catalog, image rendering)
Facebook 2006-2015, 2020-2021 (storage, networking, incident management, site performance & investigation, internal & external threats)