Senior Backend Engineer – Mobile Monetization
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Job Description
Senior Backend Engineer owning subscription and in-app purchase systems for Feeld, an inclusive dating app. Building reliable Node.js and TypeScript monetization infrastructure.
Responsibilities:
- Take ownership of the backend systems supporting Feeld’s monetisation, ensuring reliability, performance, and contribution to business goals
- Design, develop, and maintain scalable backend services and integrations for subscriptions, billing, payment processing, entitlements, pricing, and promotional features
- Ensure the accuracy, stability, and reliability of monetisation flows
- Proactively identify and resolve production issues that could impact revenue or user experience
- Support development and optimisation of subscription and payment flows, including performance, scalability, and error-handling improvements
- Implement and maintain feature flags, testing, and analytics instrumentation for experimentation and continuous improvement
- Collaborate with Product, Engineering, and Data teams on analytics and reporting capabilities
- Provide insights into revenue performance, user behaviour, and system health
- Contribute to architectural decisions and potentially act as a technical lead
- Participate in recruiter, technical, client technical, final interview, reference check, and offer stages
Requirements:
- 5+ years of commercial backend development experience, ideally building high-load, business-critical systems
- Proven experience with mobile monetisation and subscription platforms such as Adapty, RevenueCat, or comparable solutions
- Hands-on experience implementing mobile in-app purchases and subscription flows for iOS and/or Android applications
- Experience integrating mobile payment platforms with custom backend systems, including payment data synchronisation, receipt handling, subscription status tracking, and entitlement management
- Strong understanding of mobile subscription and payment lifecycles, including renewals, cancellations, refunds, failed payments, and subscription state changes
- Experience ensuring the accuracy, reliability, and consistency of revenue-critical backend systems, including troubleshooting production issues
- Strong backend development experience with Node.js, TypeScript, or JavaScript, ideally using NestJS and building GraphQL or REST APIs
- Good understanding of event-driven architectures, asynchronous processing, and distributed systems
- Experience writing reliable unit and integration tests
- Strong technical ownership, independent problem-solving, and architectural decision-making skills, with potential to take on technical leadership responsibilities
- Strong communication skills and full professional proficiency in English
- Nice to have: experience with AWS cloud infrastructure, SQL and NoSQL databases
- Nice to have: experience working directly with Apple App Store and Google Play billing ecosystems
- Nice to have: experience running monetisation experiments, including A/B testing, subscription pricing changes, and conversion optimisation
- Nice to have: experience managing regional pricing, multiple currencies, and country-specific monetisation strategies
- Nice to have: experience analysing monetisation experiment performance, including revenue, subscription conversion, and retention metrics
- Nice to have: previous experience acting as a Tech Lead or Lead Backend Engineer, mentoring engineers, and driving technical decisions
- Ability to work with an overlap from 2 to 6 pm GMT
Benefits:
- Full-time, long-term opportunity
- B2B basis contract with no VAT requirement
- Remote work from Poland, Portugal, or Spain
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