Senior Backend Engineer - Monetization & Reward Pillar (FR)Hi there! 👋
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.
Reporting directly to Ivan, you'll work as a Senior Backend Engineer on the pillar that makes WeWard's rewards real, sustainable, and trustworthy.
WeWard rewards walking — the Monetization & Reward Pillar is the engine behind those rewards. We turn user engagement into revenue through partners, affiliation and advertising, and we redistribute that value straight back to users as Wards. Every euro we earn partly returns to the people who walk — which means the integrity of our revenue and reward streams is tied directly to our P&L and to user trust.
You'll face the challenge of operating a large-scale international consumer app handling billions of interactions and strong peaks of activity every day — a domain where a missed order is lost revenue and a fraudulent one is direct loss.
The Monetization & Reward Pillar works on 3 core ambitions:
Sustainable revenue — grow the monetization engine (affiliation, partnerships, ads) that funds the entire reward economy.
A rewarding experience — make earning and spending Wards feel effortless, generous, and worth coming back for.
Integrity & trust — protect the order, commission, and reward streams end-to-end, because every euro flows back to a real user.
Your impact/responsabilities
As a Senior Backend Engineer inside the Monetization & Reward Pillar, you will:
Ship and own
Build and own the backend services powering affiliation, partner integrations and the Wards reward economy
Design resilient integrations with multiple third-party affiliation and partner platforms — each with its own API shape — so adding a new one tomorrow is a small, contained change
Own the order & commission pipeline end-to-end — ingestion, attribution, redistribution to users — where correctness maps directly to our P&L
Drive technical excellence
Build AI-assisted automation to detect anomalies and fraud in the order/commission stream and keep the reward economy clean
Contribute to pillar-level architecture with the CTO and Engineering Manager
Instrument everything — structured logging, metrics, and alerting — so we always know the pipeline is healthy and we're not losing money
Spot fragile areas, debt, and data-integrity risks early, and reduce long-term debt without derailing the roadmap
Collaborate and mentor
Frame trade-offs with Product, Data, and Finance
Guide pillar engineers on complex technical decisions
Our backend is primarily Python — but if you've mastered another backend language (Go, Rust, or anything else), that's totally OK! We pick the right tool for the job. This role also comes with a strong AI-automation scope — using AI tooling to build, and to power our monitoring and anomaly detection, is on-mission here, not a nice-to-have.
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
You're the perfect match if…
You have 5+ years of experience as a Backend Engineer, with strong proficiency in Python (or a comparable backend language such as Go or Rust) and hands-on experience shipping production services at scale
You've designed and operated third-party API integrations and data pipelines where correctness and reliability genuinely matter
You're able to understand and debug large, complex codebases — and you enjoy it
You can leverage AI and are eager to grow your skills with it — this role has a real AI-automation scope
You care about observability — logging, metrics, alerting — and about building systems you can trust on call
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 working close to the business — revenue, rewards, and the trust users place in us
You're eager to evolve in an international environment — we have offices in NYC and operate worldwide.
Bonus
Experience in monetization, affiliation, payments, or fraud/anomaly detection — any financial-data domain where bugs cost money
Hands-on experience building LLM-powered features with structured, reliable outputs
Familiarity with observability and monitoring tools (Sentry, Datadog, Grafana…)
Passionate about clean, well-tested, and maintainable code. Takes ownership and pride in code quality.
If this sounds like you, apply — we'd love to meet you. 🎉
✈️ 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
30-min technical chat with your future manager — to dive into the role and missions.
At-home case study followed by a 1 hour debrief with 3 collaborators, including time for mutual feedback.
30-min call with Kaënaath, our Talent Acquisition Specialist — to discuss your background, expectations, and answer your last questions about WeWard!
Office tour to meet other team members.
And if it’s a match… Welcome to the adventure!