Senior Backend Engineer - Affiliate & Cashback WeWard

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

Our Monetization team is growing, and we’re looking for a Senior Backend Engineer to join the journey and help us make WeWard the default gateway for online shopping — with tracking and rewards our users can trust.

You will report to Ivan and work closely with Product, Data, Customer Success, and our affiliate networks and partners.

👉 Your impact/responsibilities

As a Senior Backend Engineer in the Affiliation squad at WeWard, you will:

• Own the backend of our affiliation platform — partner catalogue, offer and reward configuration, click-out, tracking, purchase attribution and reward crediting

• Integrate and maintain our affiliate networks and providers — feeds, APIs, S2S postbacks and callbacks — and turn each new partner integration into a faster, more standardised & agentic process

• Make tracking trustworthy end to end, cutting untracked and mis-attributed purchases, our single biggest driver of support tickets and negative store reviews

• Rebuild the claims flow so users get a shorter time-to-reward, clear reasons when a purchase is rejected

• Get reward computation right across promo and flash offers, level-up bonuses, caps and category rules — where a rounding error is real money in both directions

• Scale the system across markets with per-country partners, currencies and reward rules

• Instrument and monitor the pipeline so a broken partner feed is caught by an alert, not by a Zendesk ticket

• Work hand in hand with Product, Data and Customer Success to prioritise against revenue, conversion and satisfaction KPIs

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 7+ years of backend experience, with strong Python, ideally in a consumer product at scale

• You have proven experience in the affiliation or cashback industry — you’ve worked with affiliate networks, publishers, or a cashback product, and you know how tracking, attribution windows and partner validation actually behave in production

• You’re comfortable with PostgreSQL on large volumes and with asynchronous processing (queues, workers, scheduled jobs)

• You’ve built and maintained integrations with third-party APIs you don’t control — webhooks, postbacks, feed ingestion — and you think in terms of idempotency, retries, and reconciliation

• You have a data-integrity mindset: when a system credits users with real value, you know the difference between “the job ran” and “the numbers are right”

• You take ownership in production — monitoring, alerting, and debugging a partner integration that silently stopped sending conversions

• You’re pragmatic and autonomous, able to arbitrate between a quick fix that unblocks revenue and the rework that prevents the next incident

• You communicate clearly in English and enjoy working closely with non-technical stakeholders

• Bonus: experience in adtech, payments, or e-commerce tracking, or anywhere attribution and money movement meet

• You have a startup soul, hungry to make an indelible mark on a dynamic team

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

• A 30-min interview with Valentine from the Talent team, to discuss your background, expectations, and introduce you to WeWard.

• A 45-min interview with Ivan, your future manager, to dive into the role and missions.

• A case study, followed by a debrief

• Office tour to meet other team members.

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