About
Jonathan Tiret is co-founder and CTO of Upstream. He began developing software as a teenager on Dino Gaia, a French online game, and has held engineering leadership roles at companies in ride-hailing, fintech, and legaltech, most recently as VP of Engineering at Doctrine prior to its acquisition.
Jonathan Tiret @jtiret
So excited to finally open Upstream to the world! Couldn't be more proud of what the team built, it's been a long road 🙏 https://t.co/megKPH3tbF
Jun 4, 2026 · ♥ 4
Jonathan Tiret @jtiret
Super excited to announce that I’ve teamed up with @louislecat to build a new company: @upstream_do! We're proudly backed by @ycombinator. https://t.co/LWYFodiJcN
Jul 28, 2023 · ♥ 10
Jonathan Tiret @jtiret
Je suis crypto-enthousiaste mais soyons lucides : pendant un bull run, l’écrasante majorité des détenteurs de tokens ont un objectif spéculatif. À l’arrivée, une petite minorité gagne sur le dos d’une majorité de perdants. Après on appelle ça comme on veut mais c’est une réalité. https://t.co/2hINzBjayf
May 22, 2021 · ♥ 2
Founder at UpstreamYC S23
Intro paths
Jonathan went through Y Combinator (Summer 2023) — any YC alum in your network can reach them through the YC community.
Their group partner at YC was Aaron Epstein, General Partner at Y Combinator — the partner who ran Upstream's batch and knows the company first-hand. YC profile ↗
In turn, Jonathan can intro founders to Upstream's investors below.
Upstream's investors · 4
Co-founders at Upstream
Experience
- Upstream (YC S23)Co-founder & CTOcurrent2023 — presentParis, Île-de-France, France
- Angel InvestorSeed Investorcurrent2020 — present
- Self-employedCTO & VP Engineering as a Service2021 — 2022Paris, Île-de-France, France
- DoctrineVP, Engineering2019 — 2020Greater Paris Metropolitan Region
- PhotoBoxDirector of Engineering2018 — 2019Paris Area, France
- HiPay GroupDirector, Platform Integration & Omnichannel Solutions2015 — 2018Paris Area, France
- Dino GaiaFounder2005 — 2017France
- LeCabHead Of Engineering2012 — 2015Greater Paris Metropolitan Region
- Appsfire.comSoftware Engineer2011 — 2012Greater Paris Metropolitan Region
- DegetelJunior iOS Engineer2011Greater Paris Metropolitan Region
- Klee GroupJunior Android Engineer2010Greater Paris Metropolitan Region
Education
- Y Combinator2023
- EFREI - Grande école du numériqueEngineering degree, Computer science2006 — 2011
- King's College LondonMathematics2008
Skills & more
+11 more
IT StrategyProduct StrategyProduct ManagementManagementRecruitingWeb DevelopmentPHPChefOnline GamingJavaScriptSQLLanguages English · French
- TOEIC — ETS
From Jonathan's professional profile.
Same school
Also attended Y Combinator1,475
+ 1,469 more
Also attended EFREI - Grande école du numérique4
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Also attended King's College London180
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+ 174 more
Shared employers
Also worked at Angel Investor33
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+ 27 more
