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# Senior Backend Engineer - Walking Motivations Pillar (FR)

- **Company:** WeWard
- **Location:** Paris, France (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** A/B Testing, Python (Programming Language), Backend
- **Published:** October 29, 2026
- **Apply:** https://www.welcometothejungle.com/en/companies/weward/jobs/senior-backend-engineer-walking-motivations-pillar-fr_paris_WEWAR_0dpDaDQ

## About the Role

* You have 6+ years of experience as a Backend Engineer (mostly python), 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 more than 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 - and you genuinely care about whether someone walks more because of what you built
 * You're eager to evolve in an international environment - WeWard is now present in Spain, Italy, the US, Germany, the UK, and more!

## Description

Reporting to the Walking Motivations team, alongside Surya, you'll work as a Backend Engineer on the pillar that puts the walk back at the heart of WeWard.

WeWard rewards walking - but rewards aren't the whole story. Our Walking Motivations Pillar exists to make walking itself feel good: more habitual, more meaningful, more fun. We build the features people open the app for before they ever think about the reward.

You'll face the challenge of operating a large-scale international consumer app handling billions of interactions and strong peaks of activity every day.

The Walking Motivations Pillar works on 3 core ambitions:

 * Step uplift - a measurable increase in daily steps. We move the body, not just the metric.
 * Lasting motivation - making walking a habit users come back to on their own.
 * A wonderful experience - the kind of product moment that turns a user into a multi-year member., * Power our walking experiences - step ingestion at scale, real-time gamification loops (challenges, streaks, rewards, progression), habit feedback, social mechanics
 * Build the event-driven backbone that turns every step into a signal the product can react to instantly
 * Design the data foundations that let us understand how people walk, not just how much

Drive technical excellence

 * Optimise critical paths - at our scale, milliseconds and percentages matter
 * Contribute to pillar-level architecture with the CTO and Engineering Manager
 * Spot fragile areas, debt, and security risks before they become incidents
 * Reduce long-term debt without derailing the roadmap

Collaborate and mentor

 * Frame trade-offs with PMs and Mobile engineers
 * Guide pillar engineers on complex technical decisions, 1. 30-min call with Valentine our Talent Acquisition Lead - to discuss your background, expectations, and answer your last questions about WeWard!
 2. 1-hour technical chat with your future manager - to dive into the role and missions.
 3. At-home case study followed by a 1 hour debrief with 3 collaborators, including time for mutual feedback.
 4. Office tour to meet other team members.