Hire the Best Kotlin Developers

Need someone who can build, stabilize and scale your Android product? You just found him 🤝 📊 12+ years in mobile delivery 📊 20+ Android-focused projects 📊 10+ years supporting regulated and business-critical products 📊 Experience with compliance-ready apps, secure payments, backend-heavy systems and Software Development I help companies create secure, maintainable, high-performance apps for Healthcare, FinTech and consumer products. Core Expertise 🔹 Native Android engineering with modern architecture and Software Design 🔹 Kotlin-first development with maintainability in mind 🔹 Legacy modernization from Java to Kotlin 🔹 Secure integrations, performance tuning, release stability 🔹 Product delivery for Healthcare, FinTech, consumer platforms and Mobile App Development I’m an android developer focused on products where reliability and clean architecture matter. As a kotlin developer, I build scalable solutions with android kotlin best practices, Jetpack tooling and AOSP awareness. Clients come to me for android developer kotlin expertise when they need stability, lower technical debt and growth. I work as an android app developer on products that need more than interface implementation. I support teams with android app development for secure solutions where every android app stays maintainable after launch. My background: improving an android application used by thousands of users, integrating backend systems, payment flows, and healthcare-grade data handling. That is why companies hire me as an android mobile developer ( android mobile app developer ) when they need delivery. What I Do Best ✅ Android development using Kotlin and Java ✅ Architecture design with MVVM, Clean Architecture, modularization ✅ Backend communication, authentication and payment integrations ✅ Performance optimization, debugging, maintenance and release support ✅ Application Improvement for live mobile products ✅ Solo delivery or collaboration inside a larger team My strongest specialization is android developer kotlin work. I often join teams that need android developer kotlin java skills to modernize legacy code, migrate modules, and improve release quality without a full rewrite. That work benefits from practical experience as a java developer and from thinking like an android kotlin developer who can handle new features and stabilization. Relevant Experience Highlights 🔸 Healthcare mobile applications with compliance-aware architecture 🔸 Performance optimization and crash-rate reduction 🔸 Secure data handling and app stability improvements 🔸 Secure apps with payment integration and transaction-safe flows 🔸 Backend integrations with PHP, Python, JavaScript, and REST APIs 🔸 Collaboration with iOS, backend, QA, and web teams 🔸 Ability to scale from one engineer to a delivery team I also have experience with android ble and android bluetooth features for pairing flows and reliable data exchange. Whether I contribute to an android mobile app or support an existing codebase as a mobile developer, I focus on release readiness. Tech Stack 🔸 Android kotlin with Jetpack, Compose, Android SDK, AOSP 🔸 Java, Firebase, secure cloud services, CI/CD 🔸 REST APIs, secure auth, payment gateways 🔸 Node.js, JavaScript, C#, SQL for backend alignment 🔸 Git, Android Studio, release workflows, crash analysis 🔸 MVVM, Clean Architecture, modular apps, scalability-first mindset My work is rooted in native Android, but I also understand broader product ecosystems. I collaborate effectively as an ios developer ( ios app developer ) when cross-platform alignment matters, including iOS Development discussions with teams using Swift. I have worked alongside teams using react native and reviewed delivery implications where flutter developer was involved, though I do not present those as my core specialization. That exposure helps me operate as an android developer and product-minded mobile app developer within cross-functional teams. Team & Product Collaboration 🔹 Coordination with a rest api developer 🔹 Alignment with web application development 🔹 Communication with a web developer or front end developer 🔹 Familiarity with database builder, django, and python automation Support I Can Provide ✔️ Build a mobile app from scratch ✔️ Join an existing product as an app developer android ✔️ Refactor legacy code and modernize architecture ✔️ fix android application bugs and improve release readiness I do not position myself as a wordpress, magento, game developer or unreal engine specialist and I do not use unrelated positioning such as android developer india. Even when someone types android develoer, they usually need a senior specialist who can take ownership. I built mobile applications for autism-related projects with intuitive user experience. 📬 If you need an android developer who can improve an existing product, build a reliable solution from scratch or support growth with kotlin developer depth, send me a message.

Need an Android app that is fast, scalable, and production-ready? You're in the right place. I'm Inam Ullah Khan, a Native Android Developer with 3+ years of experience building modern Android applications using Kotlin, Jetpack Compose, MVVM, Firebase, and REST APIs. I help startups, SaaS companies, and growing businesses build Android apps that are reliable, maintainable, and ready for real users. What I can help you with: • Build Android apps from scratch • Jetpack Compose UI Development • Kotlin & Java Development • Firebase Authentication, Firestore & FCM • REST API Integration • Room Database & Offline Support • Google Maps & Location Features • Payment Gateway Integration • AI Features using OpenAI APIs • Bug Fixing & Performance Optimization • Google Play Store Publishing Why clients hire me: ✓ Clean, maintainable architecture (MVVM + SOLID) ✓ Fast communication ✓ Daily progress updates ✓ Production-quality code ✓ Long-term support I focus on building Android applications that are easy to scale, easy to maintain, and enjoyable for users. If you're looking for a reliable Android developer who can turn your idea into a polished product, I'd be happy to discuss your project.

Are you tired of maintaining two separate codebases for Android and iOS? I help startups and businesses ship both platforms faster with a single, shared Kotlin codebase using Kotlin Multiplatform (KMP) and Compose Multiplatform (CMP). While most developers build for one platform, I specialize in the modern cross-platform stack that reduces your development cost by up to 50% — without sacrificing native performance or user experience. ──────────────────────────────────────────────────────────── 🔧 WHAT I BUILD ──────────────────────────────────────────────────────────── ✅ Cross-platform apps with shared UI using Compose Multiplatform (CMP) ✅ Shared business logic across Android & iOS with KMP ✅ Native Android apps with Jetpack Compose & Clean Architecture ✅ Migrating existing Android apps to Kotlin Multiplatform ✅ In-App Purchases, subscriptions & RevenueCat / Play Billing integration ✅ Push notifications (FCM / APNs), WebSockets & background processing ✅ REST API & WebSocket integration with Ktor ✅ Local caching with SQLDelight / Room KMP ✅ PDF generation, file handling, document upload & viewers ──────────────────────────────────────────────────────────── ⚙️ TECH STACK ──────────────────────────────────────────────────────────── Cross-Platform : Kotlin Multiplatform (KMP), Compose Multiplatform (CMP) Android : Jetpack Compose, MVVM, Clean Architecture, Coroutines, Flow iOS : SwiftUI interop, Xcode, CocoaPods / SPM integration Networking : Ktor, Retrofit, WebSockets, REST APIs Storage : SQLDelight, Room KMP, DataStore DI : Koin, Hilt CI/CD : GitHub Actions, Fastlane, App Store Connect, Play Console Other : Firebase, OneSignal, RevenueCat, Coil, Kotlin Serialization ──────────────────────────────────────────────────────────── 💼 REAL-WORLD EXPERIENCE ──────────────────────────────────────────────────────────── I've shipped production KMP apps including AI-powered tools that run identically on Android and iOS with shared networking, business logic, background task processing, PDF exports, and subscription flows. I understand both platforms deeply: Android lifecycle, iOS Info.plist entitlements, App Store review guidelines, and Google Play publishing. ──────────────────────────────────────────────────────────── ✅ WHY CLIENTS CHOOSE ME ──────────────────────────────────────────────────────────── → One developer. Both platforms. One codebase. → Senior-level experience — no hand-holding needed → Clear communication and on-time delivery → I write code you can maintain, not spaghetti you'll regret If you want a developer who truly understands Kotlin Multiplatform and Compose Multiplatform not just someone who Googled it — let's talk. Send me a message describing your project and I'll respond within a few hours.

I build production-ready web apps, mobile apps, and AI-powered systems, not just prototypes that break later. From idea to deployment, I help you turn your concept into a scalable, fast, and user-friendly product with clean architecture and real-world usability. 𝐖𝐡𝐚𝐭 𝐈 𝐂𝐚𝐧 𝐁𝐮𝐢𝐥𝐝 𝐟𝐨𝐫 𝐘𝐨𝐮: - Full Stack Web Apps (Next.js, React, TypeScript) - Mobile Apps (Flutter, Kotlin – Android & Cross-platform) - Backend Systems & APIs (Node.js, Express, Firebase) - AI Chatbots & AI Agents (OpenAI, Vapi, custom workflows) - Document-based AI (Chat with PDFs, knowledge systems) - E-commerce & SaaS Platforms - Automation & Integrations 𝐇𝐨𝐰 𝐈 𝐖𝐨𝐫𝐤 (𝐂𝐥𝐞𝐚𝐫 𝐏𝐫𝐨𝐜𝐞𝐬𝐬 = 𝐁𝐞𝐭𝐭𝐞𝐫 𝐑𝐞𝐬𝐮𝐥𝐭𝐬): Instead of jumping straight into code, I follow a structured approach: Understanding your idea → Goals, users, and expected outcome Planning → Scope, timeline, and best tech choices UX & Flow Design → Simple and user-friendly structure Development → Clean, scalable, and optimized code Testing & Deployment → Stable launch with real-world performance 𝐌𝐲 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤: Frontend: React, Next.js, TypeScript, JavaScript, HTML/CSS Backend: Node.js, Express.js, Firebase, REST APIs Mobile: Flutter, Kotlin, Java AI/ML: Python, OpenAI APIs, AI agents, automation systems 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐂𝐡𝐨𝐨𝐬𝐞 𝐌𝐞: I focus on solutions, not just coding I recommend better, faster, or cheaper approaches when possible I build systems that are scalable and maintainable Clear communication & on-time delivery 𝐆𝐨𝐭 𝐚𝐧 𝐢𝐝𝐞𝐚 𝐨𝐫 𝐩𝐫𝐨𝐣𝐞𝐜𝐭? Send me a message with what you're building, I’ll help you scope it, suggest improvements, and plan the best way to launch it.

🟢 AVAILABLE TODAY, 28.07 ⚡ Message me "AUDIT" - get a free 30-min Swift & iOS technical review of your app idea, architecture, or existing Swift codebase. No sales pitch. Just honest Swift engineering feedback. I'm Siarhei - Swift & Kotlin engineer, ex-CTO x 3 funded startups, CEO of Sparkler Soft. We build native iOS (Swift) and Android (Kotlin) products that ship, scale, and raise. 🔵 PROVEN RESULTS ◈ iHairium - AI Hair Diagnostics (Swift, live on App Store) Native Swift + Core ML neural network 100K+ training images, 95-98% accuracy $600K angel round + $5M seed valuation Revenue x10 to x1000 per month in early stages Google & Amazon grants, 1,000+ clinic partners onboarded ◈ Eco-Go - Electric Scooter Sharing Platform Swift (iOS) + Kotlin (Android) + Backend + IoT + Admin Panel AWS IoT Device Management, swappable battery infrastructure Named "Best Startup of the Region" ◈ BLE Wearable App (Swift + Kotlin, App Store + Google Play) HealthKit + Health Connect + RevenueCat subscriptions BLE background sync, AWS IoT Core Shipped on schedule, 5.0 client review ◈ Optics Platform (White-label, Strict NDA) Swift + Kotlin, AI-assisted frame & lens selection via device camera Active in 60+ countries, 1,000+ fitting points worldwide 10+ years on market, award-winning at international exhibitions ◈ Chibbis - Unified Food Delivery Service Swift (iOS) + Kotlin (Android) + Web + Admin Panel + CMS 600+ restaurants, 150+ cities One of the country's leading delivery platforms ◈ CoinForShop - Crypto Marketplace Swift (iOS) + Kotlin (Android) + Web (React) Non-custodial wallets, smart contract payments BTC, ETH, BCH, LTC, XMR, TRX, 100% MVP delivered ◈ Azarium - NFT Real Estate Investment Platform Swift + Kotlin, fractional property ownership via blockchain MAS-regulated, live construction webcam in-app Min investment from $200, expected ROI 30-60% 🟠 WHAT WE BUILD WITH SWIFT AND KOTLIN - Native iOS (Swift, SwiftUI, UIKit, Objective-C) - Native Android (Kotlin, Java) - Swift + Kotlin full product: app + backend + admin panel + CMS - HealthTech and AI - Swift Core ML, on-device neural networks, camera diagnostics - TensorFlow Lite, OpenCV, real-time image analysis in Swift - FinTech and Crypto - Swift + Kotlin wallets, KYC/AML, Stripe, smart contracts, NFT - Mobility and IoT - Swift + Kotlin: GPS, BLE, AWS IoT, scooter and bike sharing - Telematics, real-time fleet management - Marketplace and Delivery - Full-stack Swift + Kotlin: app + backend + admin panel + CMS - API Integrations - Stripe, Mapbox, Sumsub, Firebase, HealthKit, any third-party 🟡 SWIFT AND KOTLIN TECH STACK - Mobile: Swift, SwiftUI, Objective-C, UIKit, Kotlin, Java - Backend: Java Spring Boot, Node.js, NestJS, Golang - Frontend: React, Next.js - AI/ML: TensorFlow Lite, Core ML (Swift), OpenCV - Cloud: AWS, GCP, Azure, Docker, Kubernetes, CI/CD - Data: PostgreSQL, MongoDB, Redis, Elasticsearch - Security: OAuth2, OIDC, JWT, Keycloak, Biometrics, IAP (Swift StoreKit) 👉 Message "AUDIT" right now - 30 minutes to understand if our Swift and Kotlin team is the right fit.

I’m a mobile app developer with a strong native Android background and experience across Kotlin Jetpack Compose Flutter React Native Firebase and API driven mobile apps. I usually work with clients who need someone reliable long term someone who can take ownership keep the app stable and ship improvements consistently. I can help with Mobile app MVP development for Android and iOS Flutter React Native and native Android development Firebase Firestore Auth Storage and backend integrations API integration app architecture and data flow fixes Payment POS SDK and transaction flow integrations Bug fixing crashes performance issues and app cleanup Modern mobile UI with Compose Material design and clean UX Play Store and App Store launch preparation My working style is simple. I communicate clearly send frequent updates and focus on clean maintainable structure so the app is easy to improve later. If we work well together I’m open to an ongoing monthly setup fixed hours or retainer so you do not have to keep switching developers. If you share what you are trying to achieve whether it is a bug fix new feature MVP payment integration UI refresh or launch support I can suggest the fastest and cleanest way to move forward.