Mathilde Fontaine

S

Founder & CEO, Tandem Labs - product · community · open source

Tandem Labs
Paris, France · CET (UTC+1)
10+ years experience
Bocconi University
English, French
Hiring
Messaging unavailable

Overview

Building Tandem Labs in Paris - developer tooling. Previously built and sold a small developer tooling company. Most at home with developer tools and product. I coach a junior basketball team.

Good reasons to reach out
  • Candidates for the role I'm hiring for
  • Second opinions on Rust decisions
  • Speaking or podcast invitations
  • Early customers and design partners
Please don't message about
  • Crypto token projects
  • SEO and link-building offers

Fastest replies in the morning

Skills
open sourceproductdeveloper toolscommunityRust
HiringHiring for a role
closes in 3 months

Looking for account executives to join Tandem Labs early - developer tooling

Role
Account executive
Level
Mid
Type
Full-time
Work mode
Hybrid
Compensation
$185k-$249k + equity
Team
Founding team, 7 people
Start
As soon as possible
Must have
A record of closing B2B deals Experience selling to the buyers we sell to Clear written communication
Process
Intro call, technical deep dive, team chat

Comp €65k-€116k. Four conversations, no take-home. Message me with one thing you shipped that you're proud of.

Paris, Francerustdeveloper toolsproduct
Open

Experience

  1. Founder & CEO
    Sep 2025 - Present
    Tandem Labs · 1 yr 1 mo · Full-time · Paris, France
    • Previously built and sold a small developer tooling company.
    • Grew the team to 115 people across 3 countries.
    • Raised $16 million across 2 rounds.
  2. Staff Embedded Engineer
    Jul 2022 - Sep 2025
    Cabify · 3 yr 2 mo · Full-time · Paris, France
    • Grew the storage team from 6 to 18 engineers.
  3. Principal Engineer
    Jul 2020 - Jul 2022
    H&M Group · 2 yr · Full-time · Paris, France
    • Sit on 7 boards.
    • Led or co-led 13 investments, 2 of them now at Series B or later.
  4. ML Engineer
    May 2018 - Jul 2020
    Doctolib · 2 yr 2 mo · Full-time · Paris, France
    • Wrote the metric definitions the leadership team reviews every week.
    • Cut the time to a trustworthy experiment readout from 2 weeks to 5 days.
  5. Director of Engineering
    May 2016 - May 2018
    McKinsey & Company · 2 yr · Full-time · Paris, France
    • Built the experimentation framework 14 product teams use to ship changes safely.
    • Reduced cloud spend on storage by 33% in two quarters.

References

No references yet.

Education

  1. Bocconi University
    BSc, Economics
    2008 - 2011

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