Jonathan Tiret is a seasoned technology leader and founder, currently Co-founder and CTO of Upstream (YC S23), an async communication tool built on email. Based in Paris, he brings over a decade of experience guiding engineering and product strategy across startups and scaleups, with leadership roles at LeCab, PhotoBox, HiPay, and Doctrine. He has steered engineering organizations as VP/Director of Engineering and interim CTO, and now also offers CTO & VP Engineering as a Service to help ventures scale. As a seed investor since 2020, he backs early-stage teams while staying hands-on in architecture and delivery, with a portfolio including Yummy, Bikayi, LegionFarm, Oxygen, and LoginID. An entrepreneur from the start, he founded Dino Gaia at 16 and grew it to millions of visits and page views monthly, complemented by an engineering degree from EFREI and studies at King's College London and Y Combinator.
10 years of coding experience
17 years of employment as a software developer
Y Combinator
Mathematics, Mathematics at King's College London, U. of London
Engineering degree, Computer science, Software engineering, Communication, Project management, Marketing, Engineering degree, Computer science, Software engineering, Communication, Project management, Marketing at EFREI - Ecole Française d'Electronique et d'Informatique
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