Hire the Best App Developers in London, UK

As an App Growth consultant, I help mobile app developers achieve both organic growth and targeted user acquisition, ensuring sustained performance, higher rankings, and increased downloads. My services include: App Store Optimization (ASO) Services - keywords optimization, AB tests, competitor analysis, review and rating management, performance monitoring and reporting User Acquisition (UA) Services - paid campaign strategy & set up, campaign management & optimization, design briefs, data analytics & reporting. I also run Rankello, a boutique app growth agency that specialises on your bespoke needs.

Full stack mobile app developer with 15+ years of experience in Mobile App Development, specializing in Flutter, React Native, React, IOS, Swift, Android, Python, and Java. I have successfully delivered 120+ mobile applications in different roles as flutter app developer, flutter full stack developer, flutter flow, ai mobile app developer, mobile app design, mobile ui ux designer, ios developer, android developer, react native developer, mobile game developer achieving a 5-star rating on Upwork and helping clients scale their businesses with high-performance solutions. 🚀 Flutter Mobile App Developer | Mobile UI/UX Designer | Mobile Game Developer | Mobile Web Developer for Mobile app development project. Expert in Flutter mobile app development, delivering 30+ high-performance apps with pixel-perfect UI and smooth animations. Skilled in clean architecture and comprehensive testing for robust solutions. Experienced Mobile App Developer. 🔹 Applied game mechanics for engaging experiences in mobile development where I was a Mobile Game Developer. 🔹 Integrated real-time features, secure authentication, and cloud functions as Flutter Firebase Developer. 🔹 Built seamless API integrations and data synchronization in mobile development in Flutter mobile app development as a Flutter Laravel Specialist. 🚀 iOS app developer | Mobile UI/UX Designer | Mobile Game Developer | Mobile Web Developer in mobile app development: Developed and optimized 40+ iOS apps using Swift. Implemented complex features as iOS app developer, maintaining clean architecture and best practices. Leveraged extensive experience as iOS developer Swift to create intuitive user experiences and solve challenging technical problems. Collaborated with cross-functional teams as Swift iOS developer, utilizing Kotlin Swift expertise to deliver high-quality applications on time and exceed client expectations on iOS Swift smartphone platforms. 🚀 Android Developer | Mobile UI/UX Designer | Mobile Game Developer | Mobile Web Developer in mobile app development: Built 30+ Android apps with adaptive UI, material design, and battery-friendly performance. Expert in Android Kotlin developer, leveraging Kotlin Swift and Kotlin Multiplatform for cross-platform solutions. Optimized security as Android reverse engineer and streamlined releases as Android app publisher, enhancing engagement and update efficiency. 🚀React Native Developer | Mobile UI/UX Designer | Mobile Game Developer | Mobile Web Developer in mobile app development: Built 20+ cross-platform apps with responsive UI and seamless sync. Expert in React Native mobile, React Native Expo, and React Native Firebase for real-time features. Optimized communication with React Native WebRTC. Crafted interactive experiences as React JS and Front End React specialist. Developed hybrid solutions as Java React expert, maximizing code reuse. 📱 Performance & Scalability: Built apps supporting 1M+ users, integrating real-time updates, gamification, and video streaming. 💰 Business Impact: Helped startups and enterprises generate $10M+ in revenue through well-optimized and engaging mobile applications. iOS App Development Case Study 📱 Developed a high-performance iOS app using iOS Swift that achieved 5 star rating and featured status in the App Store. Implemented Flutter iOS compatibility for future cross-platform expansion while maintaining native performance and security. Supported iOS app marketing efforts with analytics implementation and App Store optimization, resulting in 35% higher user retention than industry average. I am currently not accepting WordPress projects as I'm focusing exclusively on mobile app development. Professional Achievements 🚀 Rewarded as 🏆 𝗧𝗢𝗣 𝗥𝗔𝗧𝗘𝗗 𝗣𝗟𝗨𝗦 🏆 🚀 4154 mobile app development hours on Upwork and still counting 🚀 100% Job Success in mobile app development (Client Satisfaction Ratio) 🚀 54+ mobile app development jobs completed successfully ✅ 98% of Clients Recommended working with me as with AI Mobile App Developer ✅ 80% Long-term Repeat Clients ✅ 15+ Years Of Experience in mobile app development, 6 years experience in Flutter mobile app development, 7 years experience in Swift and Kotlin, 4 years experience in React Native. ✅ High-Quality Work ✅ Cost-Effective AI Mobile App Developer ✅ Fluent English Verified ✅ 93% on-time delivery rate across all mobile app development milestones Got an app idea that you think is ready to make a splash? Let's dive in and explore it together in a free intro call

Hi, you can call me Kamran. I'm a professional, experienced native Android application developer who can solve your problems. ☑️7+ years of experience in Mobile Application development ☑️Graduated BS in Computer Science ☑️High-Quality Work ☑️ 99% of Clients Recommended working with me ➡ Why should you hire me? ➊ You will get Bug-free, scalable, clean, and reusable code. ➋ I will review your complete policies and confidentiality agreements. ➌ I always maintain good communication. ➍ Deliver quality work on time ➡ My Pro Skills And Experience ➊ Technology: Kotlin, Java, React Native, Flutter, Swift ➋ Databases: SQLite, MySQL, Firebase ➌ Backend: Rest API, XML, JSON, Laravel, PHP ➍ Chatting App, Google Maps, In-app purchases, and subscriptions ➎ Payment methods integration like PayPal, Esewa ➏ Web: React, PHP, Laravel, CSS, Bootstrap The services you will receive include mobile application development, bug fixing, Firebase, and API Integration. I'm a Full-Time freelancer, and feel free to contact me. I'm here to solve your complex problems right now. I am looking forward to working with you. Thanks.

Young and energetic with a new Innovative Ideas. Expertise on Web Design, Web Development, Graphic design , mobile app development, Digital Marketing & 2D Animation video. My Journey Started with a couple of local clients from London while doing my graduation and now feeling great after having clients from all over the world within 4 Years of time. I am focused to provide Ultimate solution for IT/Software solution at one place for my clients requirements. My Aim is on quality of work and therefore I am looking to provide a great experience & 100% satisfaction to my respected clients from all over globe.

⭐⭐⭐⭐⭐ Consistent 5-star feedback from long-term clients I help startups and SaaS companies launch high-performing iOS, Android, and cross-platform apps — from idea to $26M+ valuations With 13+ 𝐲𝐞𝐚𝐫𝐬 𝐨𝐟 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 𝐚𝐧𝐝 110+ 𝐚𝐩𝐩𝐬 𝐝𝐞𝐥𝐢𝐯𝐞𝐫𝐞𝐝 ,I specialize in building 𝐬𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐢𝐎𝐒 𝐚𝐧𝐝 𝐀𝐧𝐝𝐫𝐨𝐢𝐝 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬 using 𝐑𝐞𝐚𝐜𝐭 𝐍𝐚𝐭𝐢𝐯𝐞 𝐚𝐧𝐝 𝐅𝐥𝐮𝐭𝐭𝐞𝐫, backed by robust backend systems and AI integrations. I’ve helped products scale to $26𝐌+ 𝐯𝐚𝐥𝐮𝐚𝐭𝐢𝐨𝐧𝐬 by focusing on: - Performance & stability - Clean, scalable architecture - Long-term product growth What I Can Help You Build - Mobile App MVPs for startups (iOS & Android) - Cross-platform apps using React Native & Flutter - Scalable mobile architectures built for growth - Backend & API development (Node.js, Firebase, Supabase) - AI-powered features (chat, automation, recommendations) - UI/UX design focused on usability & conversion - Performance optimization & app stability - App Store & Play Store deployment and maintenance Why Clients Hire Me - 13+ years in mobile app development & full-stack engineering - 110+ production apps built with real users and live traffic - Experience across startups, SaaS, and enterprise products - Proven ability to turn ideas into revenue-generating products - Strong focus on clean code, performance, and UX - Clear communication, reliable timelines, and ownership mindset Technical Expertise Mobile Development iOS, Android, React Native, Flutter Backend & Databases Node.js, REST APIs, Firebase, Supabase, PostgreSQL AI & Automation AI chat systems, automation workflows, recommendation engines Product & UX UI/UX design, user flows, wireframes, MVP planning Delivery & DevOps Agile workflows, CI/CD pipelines, App Store & Play Store releases How I Work Understand your idea, users, and business goals Recommend the right tech stack & architecture Build a clean, scalable mobile application Test, optimize, and prepare for production launch Support post-launch scaling and improvements Let’s Get Started Send me a message with: Your app idea Target users Key challenges I’ll respond with a clear technical approach, timeline, and next steps. Ronak