> Markdown version of [/jobs/ext/4001142-senior-backend-engineer-affiliate-cashback](https://www.wearedevelopers.com/jobs/ext/4001142-senior-backend-engineer-affiliate-cashback). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Backend Engineer - Affiliate & Cashback - **Company:** WeWard - **Location:** Paris, France (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Application Programming Interfaces (APIs), Software Debugging, Python (Programming Language), PostgreSQL, Backend, Zendesk, Webhooks - **Published:** October 29, 2026 - **Apply:** https://www.welcometothejungle.com/en/companies/weward/jobs/senior-backend-engineer-affiliate-cashback_paris ## About the Role 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 ## Description 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., 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, * 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.