User Engagement Specialist - W/M/NB

  • Paris
  • Full-Time
  • Start Date: 01 September 2026
  • Apply Now

About

Founded in 2014, Karos is the European leader of carpooling for daily commutes. By changing at scale the way people commute, Karos is a major actor of the ecological transition.

The company now operates public carpooling services for more than 100 local authorities and 600 employers, with over 1.5 million users and rollouts across 6 European countries.

Since 2024, Karos is a mission-driven company (French “Société à mission”).

Our mission, written into our bylaws:

We are creating a new way of carpooling that is desirable and efficient, wherever it is useful, in order to improve everyday life and accelerate the ecological transition. As a trusted partner of key players in the territories, we are fighting to make carpooling a new standard for everyday transport.

Our impact is greatest where alternatives are lacking: daily commutes by private car.

It is on these trips — mainly home–work, peri-urban and rural — that we are committed, working with public and private stakeholders to change habits at scale.

Today, we are 100 team members, mainly based in France and Germany, and we are rapidly expanding across Europe (🇫🇷 🇩🇪 🇪🇸 🇨🇭 🇮🇹 🇳🇱).

Job Description

At Karos, our mission is to make short-distance carpooling a new form of public transport.

Helping users install lasting mobility habits is one of our strongest growth levers. We believe user engagement is not simply about sending messages—it's about delivering the right experience to the right user at the right moment.

Over the last few years, we've built the foundations of a powerful lifecycle platform with Braze, event tracking and a clear lifecycle strategy. We're now looking for someone who can turn these foundations into impactful user experiences.

As our User Engagement Specialist, you'll work closely with the User Engagement Product Manager. You will own the execution and continuous optimization of lifecycle initiatives that improve activation, retention and long-term engagement.

As part of the Product team at Karos Mobility, your missions will be:

Campaign execution: Build, launch and maintain user engagement campaigns across multiple channels (push notifications, email, in-app messages, SMS and WhatsApp), ensuring high quality and timely delivery.

Lifecycle optimization: Continuously improve lifecycle journeys by identifying friction points, proposing optimizations and iterating based on user behaviour and business impact.

Segmentation & personalization: Build user segments and personalized experiences using behavioural data to deliver the right message to the right user at the right time.

Experimentation: Design, execute and analyze A/B tests to improve conversion, engagement and retention throughout the user lifecycle.

Quality & operations: Ensure campaigns are thoroughly tested before launch, monitor their execution and maintain high operational standards across our lifecycle platform.

Performance monitoring: Track campaign performance, monitor lifecycle KPIs and share actionable insights with Product and Growth teams.

Collaboration: Work closely with Product Managers, Designers, Data Analysts and User Support to continuously improve the user experience and ensure lifecycle initiatives support company objectives.

Continuous improvement: Contribute to the evolution of our lifecycle capabilities by improving processes, documentation, automation and AI-enabled workflows.

Preferred Experience

• You speak both English and French fluently.

• You have 2–5 years of experience in user lifecycle marketing, user growth operations or user engagement.

• You have hands-on experience with Braze or another user engagement platform (Iterable, Customer.io, Salesforce Marketing Cloud, etc.).

• You are organised, autonomous and detail-oriented.

• You enjoy building operational excellence while keeping users at the centre of your work.

• You are analytical and comfortable measuring the impact of your work.

• You enjoy experimenting and continuously improving what you build.

• You are curious about AI tools and excited to use them to increase your productivity and improve workflows.

• Experience working closely with Product teams is a strong plus.

Your plus
• Karos' ambition motivates you, and you're excited about helping millions of people adopt sustainable mobility. 💚🌍

Recruitment Process

  • An initial interview to get to know your aspirations

  • An technical interview with Peguy, the User Engagement Product Manager

  • A cross-team collaboration interview with another member of the Product & Tech team

  • A fit interview to get to know our team

❗️Please send a cover letter highlighting what excites you about user engagement!

♀️♂️Ladies, we know that many women do not apply if they do not have all the listed skills, so take the leap! Gentlemen, we are also looking forward to your applications :)

Additional Information

  • Contract Type: Full-Time
  • Start Date: 01 September 2026
  • Location: Paris
  • Education Level: Master's Degree
  • Experience: > 2 years
  • Occasional remote authorized
  • Salary: between 35000€ and 45000€ / year