Get in touch

Hi, I'm Adrien Caillo:
two years inside a YC startup,
now building my own

I joined Argil (YC S24) as employee #5 and left as its Chief of Staff. Now I am building an AI running coach, from Helsinki.

Adrien Caillo reading a book at a café terrace

Recent work

Argil · AI video Backed by Y Combinator · S24

#5

Fifth employee. Two years. From Station F to San Francisco, and back to Paris as Chief of Staff.

Runners on an athletics track at golden hour, shot on film

My current project

An AI running coach that reads your night before it plans your day. In stealth, 2026.

One email when it launches. Nothing else.

Recentadventures

  1. 2026 - nowFounder, AI running coachStealth, Helsinki
  2. 2025 - 2026Chief of StaffArgil (YC S24), Paris
  3. 2024 - 2025OperationsArgil (YC S24), Paris
  4. 2024CEO's Associate, employee #5Argil, Station F to San Francisco
  5. 2023 - 2024Co-founderOlioco
  6. 2021 - 2022Content creatorYouTube
  7. 2021Legal column internLe Monde
  8. 2020 - 2022Co-founder, student mediaInstant Phileas

More stuff I made

Vol. IStudent media2020

Instant Phileas

Politics and news, told by students for students

Prize winner
National Young Press Competition
2020

2,000 followers on Instagram · co-founded 2020

From a 4,000 member Discord to a YouTube channel about crypto assets for the French community

3,000+ subscribers6k views per video, on average
Marathon
3:30
5K
19'15
Next goal
sub 3h marathon, Annecy
Station F to San Francisco, 2024
  • Started building a task manager for freelancers
  • Realise it needs AI
  • Realise I suck at AI
  • Learn AI, properly

Olioco, my first startup (2023). Never shipped. Learned so much.

Freelance

  • SEO
  • Automations
  • CRM
  • Lead generation
  • Email campaigns
  • System building

Clients include bendrec.fr

60.18° N
24.83° E

Aalto University, Espoo.
Master's, 2026 to 2027.

Raised in Paris,
getting cold in Helsinki

I grew up in Paris, then followed my studies to Strasbourg and Lille. I started with law and history, spent a month in courtrooms for Le Monde's legal column, and co-founded a student newspaper that won a national press prize.

Somewhere along the way I realised I would rather build things than write about them.

In 2024 I joined Argil as its fifth employee, and followed it from Station F to Y Combinator in San Francisco. A year later I was its Chief of Staff.

Today I study at Aalto, train for a sub 3 hour marathon and build the AI coach I wish I had.


Showing up matters