Backend Engineer - Growth team (FR)

Hi there!

About us

WeWard is the app that rewards you for walking and turns everyday steps into real-life rewards, connections, & positive impact!

Our mission is to help people move more, feel better, and make movement meaningful .

Today, we are trusted by 25M+ users worldwide , with a fast-growing, international team and offices in Paris and New York .

Our ambition is to build the world’s leading movement-and-rewards platform, scaling globally while using technology, data, and smart incentives to drive lasting behavior change and wellbeing at scale.

About the role

Reporting to the Growth team , alongside Charles , you'll work as a Backend Engineer focused on delivering value for our Growth squad: shipping features, managing the run, and helping the team move fast without breaking things.

At WeWard, we're entering an exciting new phase of evolution — expanding far beyond a simple step counter. You'll have the opportunity to work on major upcoming growth initiatives!

You'll face the challenge of operating a large-scale international platform handling billions of interactions and strong peaks of activity every day. Excellence is key: in a consumer app used worldwide, every percentage point of performance, stability, or quality directly translates into user growth, or loss.

The Growth Squad at WeWard works on 3 core elements: Acquisition, Engagement & Retention.

Acquisition means finding key events users do that indicate they are power users, and optimize advertising algorithm platforms to target similar users for us to have the best leads.

Engagement is about creating meaningful touch-points with our users, motivating them to open the app daily and build lasting habits. A core part of this is empowering business owners with a robust campaign platform to reach the right users with the right message, through the right channel.

Retention is about keeping users hooked and winning back those who've drifted away. We run continuous A/B tests across all our actions and channels to uncover the levers that drive users back into the app — and double down on what works.

Your impact/responsabilities

As a Backend Engineer inside the Growth squad at WeWard, you will:

• Improve & maintain Echo, our communication platform, and improve it to make it our global control center for user communication.

• Optimize and A/B test the Step Reminder system, our daily scheduling reminder driving a huge part of our DAUs

• Implement experiments and A/B tests to validate new features drives engagement

• Implement new features to drive Engagement & Retention all over the app

• Take initiative and be capable of leading projects from start to finish.

We’re looking for someone with a strong command of Python , ideally with experience in Flask (though we’re also open to other Python web frameworks such as Django or FastAPI ).

You should be comfortable working on infrastructure at scale, where optimization and performance is the key to handle our millions of users.

You should care as much as possible about code quality while remaining pragmatic about delivering value to users. It’s important to have a clear vision of the ideal architecture we should aim at.

Beyond pure development, we expect you to challenge the architecture , propose meaningful improvements, and collaborate effectively with DevOps, Product, and Marketing teams

Our commitments

• SUCCEED — You’ll join a team of passionate people who share values of ambition and determination

• TRUST — We give you real autonomy , trusting you to reach your goals in your own way

• ⛏️ EXPLORE — You’ll grow in a culture that’s constantly evolving and curious about what’s next

• PROGRESS — We’ll support you through challenges, learn from mistakes, and move forward together

• SMILE — And every day, you’ll be part of a fun and positive environment where humor is always welcome

Preferred experience

What we’re looking for

You’re the perfect match if…

• You have 4+ years of experience as a Backend Engineer , with hands-on exposure to large-scale, high-traffic systems and a strong sense of ownership over what you build.

• You love combining continuous improvement and agility , always bringing new ideas to the table. At WeWard, our spirit is Test & Learn — we trust you to experiment (we deploy to production around ten times a week!).

• You have a natural interest in the startup world and want to make a tangible impact in your next adventure.

• You’re motivated by contributing to the health and wellness sector .

• You’re eager to evolve in an international environment — WeWard is now present in Spain, Italy, the US, Germany, the UK, and more!

If this sounds like you, apply — we’d love to meet you.

What we offer

• ✈️ A global, mission-driven team with teammates in Paris, NY, London, Boston!

• ‍♀️ A healthy work/life balance (we walk the talk)

• Annual learning & dev budget (you grow, we grow)

• Hybrid work, with 2 days of remote work per week

• (Really, really) Cool office in central Paris with snacks, a walking desk and a huge Wardy hanging around

Recruitment process

1. 30-min technical chat with Charles , your future manager , to dive into the role and missions.

2. A case study followed by a 1 hour debrief with Charles and Tyler , our Head of Growth, including time for mutual feedback.

3. Office tour to meet other team members.

And if it’s a match… Welcome to the adventure!