jcleveley
Summary
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SeniorJohn Cleveley is an experienced engineering manager with 14 years building high-traffic news and media sites, currently leading engineering at Facebook after senior roles at BuzzFeed and BBC News. He combines hands-on hacking in JavaScript, PHP and Ruby with TDD/BDD discipline to keep code lean and reliable while obsessing over web performance and minimizing every HTTP request and redraw. His background includes architecting scalable systems using Varnish and Memcache and leading major platform migrations and product launches like the next-generation iPlayer and UK Radioplayer. A practiced speaker at Velocity, EdgeConf and other conferences, he enjoys sharing performance and scaling techniques with the community. Based in London, he blends deep systems engineering (First Class MEng) with a product-focused mindset for delivering resilient, globally performant web experiences.
14 years of coding experience
Github Skills (8)
responsive9
react8
mapper6
php4
webpagetest3
link-checker1
checker1
ruby1
Programming languages (2)
Github contributions (5)
jcleveley-zz/EntityMapper
Dec 2011 - May 2014
Contributions:33 commits in 2 years 5 months
phparraymapper
jcleveley/dotfiles
Jan 2026 - Jan 2026
Contributions:2 pushes, 1 branch in 5 days
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