Sergey F.

🔥 Do you need to build a high-quality Mobile App that brings real Revenue — not just downloads? 🔥 ✔️ I Develop Mobile Apps designed to maximize your chances of Success. ✔️ I have a background in Product Management. I don’t just write code — I build Businesses. ✨ MVP Strategy: I help you define the core features that validate your idea without wasting time and budget on the wrong direction. ✨ Product-First Approach: My development process gives you the exact instruments you need to test your hypotheses in the real market. I develop cross-platform and native iOS and Android applications using React Native, TypeScript, Swift / SwiftUI / Kotlin, UI/UX Design. I specialize in subscription-based apps, combining strong engineering skills with deep product growth expertise and UI/UX Design. 💡 My focus areas include: - AI-powered apps - Productivity tools - Utilities - Health & fitness apps - Trackers - Lifestyle - Business applications. 💡 I am a Senior Product Engineer combining 10+ years of mobile development (iOS/Android) with hands-on UI/UX design experience. I specialize in building, designing, and scaling profitable subscription-based mobile apps from scratch. My focus goes beyond writing code — I handle the full lifecycle from Figma design to high-converting App Store/Google Play deployment, leveraging AI workflows to ship 3x faster. 💡 As a Growth expert, I can advise how to increase app engagement, optimize retention, and grow your MRR. Whether you’re launching a new mobile app or improving an existing one, I can guide you through development, monetization, and analytics setup. 🏆 My achievements: - 10,000,000+ app users - 100,000+ App Store subscriptions - 99% crash-free rate - Trial conversion rate — up to 15% - Paid conversion rate — up to 5% - 1st day retention rate — up to 40% 🎓 My approach: - Product Design (UI/UX, Customer Development, JTBD, CJM) - Agile/SCRUM development for fast feedback - Data-driven decisions using Amplitude / AppsFlyer - Subscription analytics via Adapty / RevenueCat - Clean and scalable code in TypeScript, following SOLID principles - Clear, structured delivery process and transparent communication - AI-driven workflows for faster feature delivery You’ll get: - A clickable UI/UX prototype in Figma - A stable, scalable Cross-Platform app ready for the App Store or Google Play - Advanced analytics and dashboards for decision-making - Subscription tracking and flexible revenue management - A partner who understands both mobile development and growth strategy 👉 If you’re looking for a mobile developer who can build and grow your iOS and/or Android app from idea to revenue — let’s talk. My skills in iOS development: React Native, TypeScript, Swift, SwiftUI, Flutter, FlutterFlow, Dart, Kotlin, iOS, Android, Objective C, UIKit, Multithreading, Memory management, API, JSON, HTML, XML, Networking, Push notifications, CoreData, Combine, SOLID principles, Design patterns, MVC, MVP, MVVM, Coordinators, Xcode, GIT, SwiftLint, DI, CI/CD, Firebase, AppStore, ASO, Amplitude, AppsFlyer, Figma, UI/UX, Agile, Scrum, Kanban, AI.