Senior Backend Engineer – Mobile Monetization

This is a fully remote position, open to applicants in Poland, +2 more countries.

📋 Description

• Assume responsibility for the backend systems that support Feeld’s monetization, ensuring reliability, performance, and alignment with business objectives.

• Design, develop, and sustain scalable backend services and integrations for subscriptions, billing, payment processing, entitlements, pricing, and promotional features.

• Ensure the precision, stability, and dependability of monetization flows.

• Actively identify and resolve production issues that may affect revenue or user experience.

• Assist in the development and optimization of subscription and payment flows, focusing on performance, scalability, and error-handling enhancements.

• Implement and manage feature flags, testing, and analytics instrumentation for experimentation and continuous enhancement.

• Collaborate with Product, Engineering, and Data teams on analytics and reporting functionalities.

• Offer insights into revenue performance, user behavior, and system health.

• Contribute to architectural decisions and potentially serve as a technical lead.

• Participate in various stages of recruitment, including technical interviews, client technical evaluations, final interviews, reference checks, and offer discussions.

⛳️ Requirements

• Over 5 years of commercial backend development experience, particularly in building high-load, business-critical systems.

• Demonstrated experience with mobile monetization and subscription platforms such as Adapty, RevenueCat, or similar solutions.

• Practical experience in implementing mobile in-app purchases and subscription flows for iOS and/or Android applications.

• Experience in integrating mobile payment platforms with custom backend systems, including payment data synchronization, receipt handling, subscription status tracking, and entitlement management.

• Comprehensive understanding of mobile subscription and payment lifecycles, encompassing renewals, cancellations, refunds, failed payments, and subscription state changes.

• Proven experience in ensuring the accuracy, reliability, and consistency of revenue-critical backend systems, including troubleshooting production issues.

• Strong backend development skills with Node.js, TypeScript, or JavaScript, preferably using NestJS and building GraphQL or REST APIs.

• Good knowledge of event-driven architectures, asynchronous processing, and distributed systems.

• Experience in writing reliable unit and integration tests.

• Strong technical ownership, independent problem-solving, and architectural decision-making capabilities, with the potential to assume technical leadership roles.

• Excellent 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 conducting monetization experiments, including A/B testing, subscription pricing adjustments, and conversion optimization.

• Nice to have: experience managing regional pricing, multiple currencies, and country-specific monetization strategies.

• Nice to have: experience analyzing monetization experiment performance, focusing on revenue, subscription conversion, and retention metrics.

• Nice to have: previous experience in a Tech Lead or Lead Backend Engineer role, mentoring engineers, and influencing 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.