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Jonathan Tiret

InvestorFounder

Founder at Upstream

Paris, Île-de-France, France

FoundedUpstream · YC

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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.

Founder at UpstreamYC S23

Intro paths

YC

Jonathan went through Y Combinator (Summer 2023) — any YC alum in your network can reach them through the YC community.

GP

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 ↗

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In turn, Jonathan can intro founders to Upstream's investors below.

Upstream's investors · 15

BIP VenturesAtlantaBloomberg BetaSan Francisco · $25K – $1M checksBlumberg CapitalMiami · $500K – $5M checksConnect VenturesLondon · $500K – $5M checksConnect VenturesLos AngelesConnect VenturesLondon · $500K – $5M checks · since 2026Financière Saint JamesParisKima VenturesParis · $50K – $5M checksMotier VenturesParis · $330K – $3.3M checksRecursion VenturesRoosh VenturesKiev · since 2026Roundtable Elyos Energy, SpecialLuxembourgSequoia CapitalMenlo Park · $100K – $50M checksSquared VenturesY CombinatorSan Francisco · $500K checks · since 2023

Co-founders at Upstream

LLLouis Lecat
Louis LecatFounder
AT
Alex TaubFounder
MS
Michael SchonfeldFounder

Investments

Investor

SellRaze

Per curated public sources.

Frequently asked questions

Who is Jonathan Tiret?
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.
Where does Jonathan Tiret work?
Jonathan Tiret is Founder of Upstream.
What companies did Jonathan Tiret found?
Jonathan Tiret founded Upstream.
What companies has Jonathan Tiret invested in?
Investments tracked here include SellRaze.

Founder mafias

Klee Group mafia2

Also came through, then founded or led a company.

Youssef SaidSoftware EngineerFounded erad

About this profile. Compiled from public sources — Upstream's own website and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights