Jonathan Tiret
Co-founder & CTO at Upstream (YC S23)
Paris, Ile-de-France
Summary
👤
Senior🎓
Top SchoolJonathan Tiret is a seasoned technology leader and co-founder currently serving as CTO of Upstream (YC S23), with 11 years of engineering and leadership experience building products that scale. He has led engineering, platform and omnichannel teams at fast-growing companies like HiPay, Photobox and Doctrine, and served as interim CTO/VP engineering and seed investor supporting startups across Europe and LATAM. Jonathan combines hands-on product engineering (mobile, web, infrastructure) with strategic skills in org design, technical due diligence and developer experience. He founded a high-traffic web startup as a teenager, demonstrating early product instincts and growth savvy that still inform his founder-first approach today. Based in Paris, he blends YC-backed startup experience with practical VC-facing audit and training work, making him equally comfortable shipping code or advising founders on scaling technology teams.
11 years of coding experience
17 years of employment as a software developer
Y CombinatorEngineering degree Computer science Software engineering Communication Project management Marketing, Engineering degree Computer science Software engineering Communication Project management Marketing at EFREI - Grande école du numériqueMathematics, Mathematics at King's College London
French, English
Stackoverflow
214reputation
50kreached
4answers
2questions
Github Skills (46)
mkdocs9
sphinx-doc9
python9
sphinx9
devrel9
portal9
markdown8
actionsheet6
chef-infra6
documentation6
demandware6
aws-lambda6
apple-push-notifications6
cartridge6
objective-c6
Programming languages (7)
Github contributions (5)
snapcar/snapcar-sdk-js
Mar 2015 - Aug 2015
Contributions:17 releases, 75 pushes, 3 branches in 5 months
dinogaia/application_php
Apr 2016 - Apr 2016
Contributions:3 pushes in 6 days
phpcookbookphp-application
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