Handcheck.
Who we are

Two people. One handshake.

🤝 Handcheck is small on purpose. We work the same way and share the missions: one of us runs yours from start to finish, with no other client at the same time. The person you meet on the first call is the one who hands you the result, and who signs the certificate of deletion.

Next mission can start in November, with either of us. We each take two missions a month, one after the other. Updated 26 September 2026.

Gauthier Nadaud

Gauthier Nadaud

Product builder, founder for ten years

Founded and ran Smiirl for ten years, connected objects sold in 85 countries. Then three years as entrepreneur in residence at the French government’s digital agency (beta.gouv.fr). Executive Master, École polytechnique.

Load
  • Oct
  • Nov
  • Dec
Next opening: November
LinkedIn →
Henri Casalis

Henri Casalis

AI automation and client operations

Independent consultant in AI automation. He builds tools that go and fetch public data and put it to work: a radar that spots restaurants before they open, a family-tree quiz of 7,000 records, aerial photos of France since the 1950s. Before that, customer teams at Malt and Finary, and business development at Smiirl, where the two of us first worked together.

Load
  • Oct
  • Nov
  • Dec
Next opening: November
LinkedIn →
  • Only the two of us handle your files.Under NDA, deleted at the end.
  • One client at a time, each.Your address book has one of us to itself.
  • Made in Paris 🥐And delivered in person.
Invitation only

Shall we look at yours?

Each of us takes one client at a time, on recommendation. Tell us who sent you, and we’ll be in touch.