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Justine Rousseau

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Senior Product Manager at Kingsway Consulting · Onboarding and activation

Works at
Kingsway Consulting
Location
Paris, France · CET (UTC+1)
Experience
11+ years experience
Education
École Polytechnique
Languages
English, French
Collaborating
Message Connect

Overview

Currently at Kingsway Consulting, where I work on onboarding and activation. Launched the growth product in 8 markets. Grew growth revenue from $8 million to $57 million ARR. Before that: Klarna and Novo Nordisk. Most at home with growth and experimentation.

Good reasons to reach out
  • Collaborators for my side project
  • Speaking or podcast invitations
Please don't message about
  • Sales demos
  • Crypto token projects
  • Feature requests for my employer's product

Replies within two days

Skills
user researchexperimentationgrowthlifecycleSQL
CollaboratingLooking to collaborate
closes in 3 months

Side project in mobility: need a marketer to build with

Project
Mobility: need a marketer to build with
Skills needed
Writing, experimentation
Time commitment
Part-time
Outcome
Open-source release

No money involved, just a good project. Based in Paris, happy to work remotely.

Paris, France · remote OKlifecyclesqluser research
Open

Experience

  1. Senior Product Manager
    Dec 2025 - Present
    Kingsway Consulting · 11 mo · Full-time · Paris, France
    • Cut time-to-first-value for new growth customers from 10 days to 3.
    • Took growth activation from 26% to 45% in three quarters.
    • Launched the growth product in 11 markets.
  2. Product Manager
    Jun 2022 - Dec 2025
    Klarna · 3 yr 6 mo · Contract · Paris, France
    • Took growth activation from 28% to 38% in three quarters.
    • Killed 4 features nobody used and shipped the 2 that customers asked for.
  3. Product Manager
    Dec 2020 - Jun 2022
    Novo Nordisk · 1 yr 6 mo · Full-time · Paris, France
    • Launched the growth product in 8 markets.
    • Killed 7 features nobody used and shipped the 2 that customers asked for.
  4. Associate Product Manager
    Sep 2018 - Dec 2020
    Trade Republic · 2 yr 3 mo · Full-time · Paris, France
    • Grew growth revenue from $4 million to $42 million ARR.
    • Ran 180 customer interviews before writing the first spec.
  5. Associate Product Manager
    Feb 2016 - Sep 2018
    BBVA · 2 yr 7 mo · Full-time · Paris, France
    • Grew growth revenue from $8 million to $57 million ARR.

Projects

Write-up: onboarding and activation in practice
2026

A long-form guide to onboarding and activation for people starting out.

Onboarding and activation benchmark
2023

Reproducible benchmarks comparing lifecycle and growth on real workloads.

References

No references yet.

Education

  1. École Polytechnique
    Ingénieur, Computer Science
    2011 - 2015

Details

Compensation expectations
What they are targeting for their next role.
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