---
title: 'Senior Backend Engineer (Mobile Monetization) | Feeld at GT'
canonical: 'https://feeny.ai/job/senior-backend-engineer-mobile-monetization-feeld-gt-poland-3vcfxcm10a3t'
type: 'job'
last_seen: '2026-11-12'
---

# Senior Backend Engineer (Mobile Monetization) | Feeld at GT

- **Company:** GT
- **Location:** Poland
- **Employment:** full-time
- **Work type:** remote
- **Posted:** 2026-11-02
- **Last confirmed live:** 2026-11-12
- **Apply:** https://jobs.ashbyhq.com/gt-hq/e5517b0f-7cc5-4045-ab70-69222c281e88

## Job description

GT was founded in 2019 by a former Apple, Nest, and Google executive. GT’s mission is to connect the world’s best talent with product careers offered by high-growth companies in the UK, USA, Canada, Germany, and the Netherlands. On behalf of Feeld, GT is looking for a Senior Backend Engineer to help them improve their inclusive dating application.

## About the Client

Founded in 2014 as a dating app, Feeld gathered millions of users in one place to create a safer and more inclusive space online for everyone open to experiencing people and relationships in a new way. Their mission is to elevate the human experience of sexuality and relationships and create a world where everyone is more intimately connected to each other and themselves. The technology stack of the project: Node.js, NestJS, GraphQL/REST, TypeScript, AWS, DynamoDB, PostgreSQL, SQS, EventBridge, WebSockets.

## About the Role

We are looking for a Senior Backend Engineer (Mobile Monetisation) to take ownership of the backend systems powering Feeld's subscription and in-app purchase experiences across iOS and Android. The ideal candidate brings strong hands-on experience with mobile monetisation platforms such as Adapty, RevenueCat, or similar solutions, as well as integrating mobile payment flows with custom backend services. This includes managing subscription lifecycles, synchronising payment data, handling receipts, and ensuring accurate entitlement management. We're looking for a highly experienced, proactive engineer with the potential to act as a technical lead, capable of independently driving complex technical initiatives, contributing to architectural decisions, and ensuring the reliability and scalability of revenue-critical systems. 📌 Full-time, long-term ⌛️ Preferred immediate start

Responsibilities:

- Take ownership of the backend systems supporting Feeld’s monetisation, ensuring their 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 identifying and resolving production issues that could impact revenue or user experience.
- Support the development and optimisation of subscription and payment flows, including improvements to system performance, scalability, and error handling.
- Implement and maintain feature flags, testing, and analytics instrumentation to support experimentation and continuous improvement of monetisation features.
- Collaborate with Product, Engineering, and Data teams to build and improve analytics and reporting capabilities, providing insights into revenue performance, user behaviour, and system health.

Essential knowledge, skills & experience:

- 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, beyond web-based payment integrations.
- 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 or 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 the 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. Our current stack includes ECS, DynamoDB, SQS, EventBridge, and PostgreSQL.
- Experience working directly with Apple App Store and Google Play billing ecosystems.
- Experience running monetisation experiments, including A/B testing, subscription pricing changes, and conversion optimisation.
- Experience managing regional pricing, multiple currencies, and country-specific monetisation strategies.
- Experience analysing the performance of monetisation experiments, including revenue, subscription conversion, and retention metrics.
- Previous experience acting as a Tech Lead or Lead Backend Engineer, mentoring engineers, and driving technical decisions.

Interview Steps

- GT interview with Recruiter
- GT technical interview
- Client technical interview
- Final interview
- Reference Check
- Offer

## About GT

## Company Overview
- **One-liner**: GT is a boutique tech partner that helps high-growth companies design, build, and scale digital products, offering end-to-end product development, AI/ML implementation, and team scaling services.
- **Entity Type**: Private (Bootstrapped)
- **Headquarters**: Multiple locations across Europe, North America, and the UK (remote-first)
- **Founded**: 2019
- **Founders**: Andy Baynes (Co-founder & Chairman), Nikita Gorskykh (Co-founder & CEO), John Harris (Co-founder & CTO)

## Core Business
- **Primary Industry**: Technology Consulting & Custom Software Development
- **Target Customers**: High-growth companies, from fast-moving startups to global enterprises, primarily in the UK, US, Canada, and Europe
- **Mission**: To become a meeting point for the world’s best engineers and product companies with a tremendous and meaningful mission to implement in life [dou.eu](https://dou.eu/en/companies/https-www-gt-hq-com-career)

## Products & Services
- **Activate (Exploratory Projects)**: Focused, short-term engagements for AI adoption, migration assessment, or guiding a product’s next direction.
- **Scale (Team Expansion)**: Mid-to-long-term team scaling — a handpicked team of engineers hired specifically to client requirements, onboarded within 6 weeks, with no rotation between projects.
- **Deliver (End-to-End Development)**: Full management of a project from brief to launch, handling complete product development and seamless delivery.
- **Implement AI**: From exploring AI opportunities to fully implementing tailored AI/ML and data science solutions that drive growth.
- **Expertise Areas**: Full-stack development, AI/ML and data science, product management, data insights & visualization, quality management, and security advisory.

## Market Standing
- **Valuation/Market Cap**: Not publicly available (private, bootstrapped company)
- **Key Metric**: 686 total employees (as of mid-2026) [builtin.com](https://builtin.com/company/gt)
- **Notable Clients/Projects**: McLaren, Universal Studios, Jaguar Land Rover, Rio ESG, Eagle Genomics, Lumin Fitness [dou.eu](https://dou.eu/en/companies/https-www-gt-hq-com-career)
- **Growth Signals**: Founded in 2019 by leaders from Apple, Nest, Google, and GSK; operates across 26+ locations globally; strong remote-first culture with 91% eNPS and a Glassdoor rating of 4.6 [gt-hq.com](https://gt-hq.com/career)

## Competitive Advantages
- **Founding Team Pedigree**: Built by former executives from Apple, Nest, Google, and GSK — deep expertise in product development at scale.
- **No Engineer Rotation**: Unlike many outsourcing firms, GT never rotates engineers between projects, ensuring continuity and deep client relationships.
- **Boutique, High-Touch Model**: Focused on quality over volume, working with ambitious, world-changing products.
- **Data-Driven & Engineer-First Culture**: Emphasis on data-informed decisions, feedback loops, and resourceful thinking.

## Strategic Focus
- **Geographic Expansion**: Growing teams across Europe, North America, and the UK with remote and hybrid opportunities.
- **AI/ML Leadership**: Heavy investment in AI and data science capabilities to help clients adopt emerging technologies.
- **Client Diversity**: Serving both fast-moving startups and large-scale data transformation initiatives across industries like AR/VR, automotive, medtech/healthcare, and data science.

## Why Work Here
- **Culture**: Described as "engineer first and care driven" — a team of curious minds, creative thinkers, and builders who care about impact. Values include drive innovation, take responsibility, think resourcefully, use feedback and data, and exceed expectations.
- **Work Model**: Remote-first with hybrid options; employees can choose their own pace and working style — impact is what matters.
- **Perks**: Health insurance, psychotherapy coverage, learning budget, self-development investment, sports and mindfulness practices, mental support allowance, and fun team parties.
- **eNPS**: 91% (internal survey) [gt-hq.com](https://gt-hq.com/career)
- **Glassdoor**: 4.6 rating
- **Team Environment**: Described as initiative, hard-working, mature, curious, and optimistic — a "glass-half-full" community.

## Sources
1. [gt-hq.com](https://gt-hq.com/career)
2. [gt-hq.com](https://gt-hq.com/)
3. [builtin.com](https://builtin.com/company/gt)
4. [dou.eu](https://dou.eu/en/companies/https-www-gt-hq-com-career)
5. [jobs.ashbyhq.com](https://jobs.ashbyhq.com/gt-hq)

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