Hire the Best Kotlin Developers
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I’m an experienced Mobile Engineer & Team Lead with 11+ years of expertise in Android and iOS development, delivering apps that have reached millions of users worldwide. Over the years, I’ve built, scaled, and maintained enterprise-grade apps as well as specialized custom solutions, with a strong focus on performance, clean architecture, and modern mobile best practices. What I Do Best: Mobile Development (Android & iOS) – Expert in Android (Kotlin/Java) and experienced in iOS (Swift/SwiftUI), building high-quality, production-ready applications across both platforms. Strong knowledge of Jetpack, coroutines, Hilt/Dagger, Room, Navigation, RxJava, Firebase, and App Store / Play Store guidelines. App Architecture & Performance – Scalable MVVM/MVI architectures, optimized UI patterns (RecyclerView, ViewPager2), efficient state management, robust caching, and offline-first strategies. Authentication & Security – OAuth2, token refresh flows, secure storage, deep linking (Branch), push notifications (FCM/APNs), and analytics integrations (MoEngage, Firebase). Team Leadership – Currently serving as Engineering Lead (Mobile), mentoring developers, driving architecture decisions, and ensuring delivery under tight timelines. What You Can Expect: ✔️ Fast & reliable delivery – I prioritize hitting deadlines without compromising quality. ✔️ Clear communication – Regular updates, proactive suggestions, and collaborative problem-solving. ✔️ Long-term value – I don’t just build apps; I help you plan for scale, stability, and future growth. ✔️ Hands-on expertise – Whether fixing urgent production crashes, building new features, or leading full app development, I take ownership until the job is done right.

Hands-on mobile app developer with more than 10 years experience. Capable of deciding which architecture to use on specific project and love to give opinion plus suggestion if needed. Have advantage than other flutter's developer since I've have native language skill (Swift, Kotlin, Objective-c, Java). Love to explore various framework and technology to serve the app with better performance so that customer will experience smooth buttery app.

I help enterprises, founders & funded startups building scalable production grade MVPs, multi-tenant SaaS platforms, AI SaaS, web, mobile, desktop & software applications, internal tools, business process automation systems, data-intensive backend systems & cloud-native platforms designed for scalability, reliability, security, maintainability, observability, and long-term growth. I’m 𝐓𝐨𝐩 𝟏% Senior Full Stack AI & Software Developer (expert vetted by Upwork) with 18 years of ‘traceable experience’ architecting, developing & deploying custom production-grade software platforms, including custom AI-powered SaaS apps I serve as a strategic ‘technology partner’ throughout the SDLC: from product requirements mapping, system architecture design, database design, API strategy, AI integration, and infrastructure planning to front-end & back-end development, full-stack development, cloud deployment, production launch, and ongoing support. I’ve delivered 200+ custom software solutions for Fortune 500 companies, US enterprises, founders, and funded startups across 38 countries, with a strong track record of client satisfaction. My work usually starts with building an MVP from scratch, scaling a product with traction, modernizing a legacy system, rescuing an unstable platform, improving performance, or integrating AI/new product capabilities without disrupting core operations. From there, I convert business goals, ROI expectations, user workflows, compliance needs, budget, and timeline into a development plan covering scope, milestones, architecture, integrations, testing/UAT, and rollout. For founders and funded startups, I help turn early product ideas, business models, and ROI expectations into a focused MVP scope, scalable architecture, launch roadmap, and growth plan without overbuilding too early. I design system, cloud, data, AI, SaaS, security, and integration architectures based on product stage, scalability needs, compliance requirements, operational complexity, and cost. My approach covers practical architecture decisions, secure integrations, tenant isolation, data modeling, AI-ready data foundations, production deployment, observability, reliability planning, and long-term maintainability. Industry & domain experience: I've built & modernized software architecture across Healthcare, EHR, EMR, HIPAA, FinTech, Finance, Banking, Insurance, Sales & Marketing, Education, Legal, Manufacturing, Chemical, Media, Real-estate, Supply-chain, Logistics, Construction, Automotive, Retail, AI SaaS MVP, B2B SaaS, eCommerce, iGaming, Marketplaces,delivery, booking, listing, mobile apps, EdTech, LMS, CRM, ERP, Business process automation, multi-tenant SaaS Platforms Whether you need a skilled development partner to build custom software, integrate AI, modernize legacy systems, or design scalable architecture for long-term growth, feel free to reach out! Our Development Team & Tech Stack: Frontend Dev: React, Next.js, TypeScript, JavaScript, Tailwind CSS, shadcn/ui. Mobile & Desktop Dev: React Native, Flutter, Swift, Kotlin, Electron Game Dev: Unity, C#, Unreal Engine 5, C++, Blueprints, Photon, PlayFab, Roblox Studio, Luau Backend Dev: Node.js, NestJS, Express.js, Python, FastAPI, Django, Java, Spring Boot, Golang APIs: REST, GraphQL, WebSockets, gRPC, OpenAPI, Swagger. Databases: PostgreSQL, MySQL, MongoDB, Redis, DynamoDB, Supabase, Firebase Firestore, RDS, Elasticsearch, OpenSearch, Amazon S3. Data Engineering: SQL, Pandas, NumPy, Apache Kafka, RabbitMQ, Apache Airflow, dbt, Apache Spark, Snowflake, BigQuery, Amazon Redshift AI & ML: OpenAI, Claude, Gemini, Llama, Mistral, PyTorch, TensorFlow, Scikit-learn, XGBoost, LightGBM, Hugging Face Transformers, LangChain, LangGraph, LlamaIndex, CrewAI, AutoGen, DSPy Vector Search: pgvector, Pinecone, Weaviate, Qdrant, FAISS, Chroma Computer Vision, NLP & AI Voice: OpenCV, YOLO, spaCy, Whisper, Deepgram, ElevenLabs Cloud / DevOps: AWS, GCP, Azure, Docker, Kubernetes, Terraform, GitHub Actions, GitLab CI/CD, Vercel, Cloudflare, Nginx Security / Auth: OAuth2, OpenID Connect, Auth0, Clerk, Okta, JWT, SAML, Vault, AWS Secrets Manager Testing / Monitoring: Jest, PyTest, JUnit, Playwright, Cypress, Postman, Datadog, Grafana, Prometheus, Sentry, OpenTelemetry, CloudWatch Compliance: HIPAA, SOC2, PCI-DSS, GDPR, ISO 27001, NIST, HL7/FHIR, KYC/AML, PII/PHI Software Development Services & Technical Capabilities: Full Stack Development, Software Development, AI Development Team, Front & back end dev, Artificial intelligence, Machine Learning, Deep Learning, Web Development, Web Application, Mobile App, AI native web development, API Integration, Full Stack developer, React & Python developer, AI developer, Web, Mobile & Software Dev, AI SaaS Dev, AI/ML, NLP, LLM, OpenCV, Algorithm, Chatbot, Developer, AI Integration, AI Consultant, OpenAI, AWS, AI Agent Developer, Software Architecture & Design, AI Model Integration, Database Architecture, Solution Architecture

Expert Full Stack Developer | Fractional CTO | Expert React.JS Developer | Expert Full-Stack Developer | Fractional CTO | Python | JavaScript | Django Hi, I’m 𝐅𝐚𝐡𝐚𝐝 𝐈𝐪𝐛𝐚𝐥 , a Senior Mobile Developer, Backend Engineer, and Solution Architect with 14+ years of experience building high-performance iOS, Android, and cross-platform applications using Swift, Kotlin, Flutter, Python, and Laravel. I help startups, enterprises, and government organizations design, build, and scale secure, AI-powered mobile and backend solutions with clean architecture, real-time integrations, and seamless user experiences. My expertise spans across mobile app development, API engineering, AI/ML integration, and DevOps automation. ✅ I also provide Fractional CTO Services to my Clients: - Fractional CTO - Technical Advisor - Technical Consultant - Solution Architect - Enterprise Software Architect - Technical Project Manager - Senior Product Manager - Product Delivery Expert 𝐌𝐲 𝐬𝐭𝐫𝐨𝐧𝐠 𝐬𝐢𝐝𝐞 𝐚𝐬 𝐚 𝐒𝐞𝐧𝐢𝐨𝐫 𝐟𝐮𝐥𝐥 𝐬𝐭𝐚𝐜𝐤 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫: ✅ Front-end: TypeScript, JavaScript, React, Frontend React, React Native, Vue, Redux, Zustand, MobX, GraphQL, HTML5, CSS3 (with Sass, Bootstrap, MaterialUI, Styled-components, Flex, and Grid), Three.js, etc. ✅ Back-end: Node.js, Next.js, Nest.js, Express, Fastify, PHP, Laravel, Java. ✅ Databases: Postgres, MySQL, Redis, MongoDB. ✅ C# Azure Func­tion App for enterprise services. ✅ 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 & 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫𝐢𝐧𝐠 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: AVP Mobile Engineer / Assistant Vice President (Mobile) Senior Mobile App Developer (iOS & Android) Full Stack Mobile & Backend Developer Flutter Developer Native iOS Developer (Swift, SwiftUI) Native Android Developer (Kotlin) Cross-Platform Mobile Developer Backend Developer (Python, Laravel, Node.js) RESTful API Developer Secure App Architect (GDPR, PCI-DSS, PSD2) Agile Technical Project Lead CI/CD Pipeline Engineer (Bitrise, Jenkins, GitHub Actions) Enterprise Mobile Consultant Banking App Development Expert AI Integration Engineer (Image Recognition / ML) ✅ Tools & Technologies I Specialize In: 🔹 Mobile & Cross-Platform: Swift, Kotlin, SwiftUI, Flutter, React Native, Objective-C, Android SDK, Xcode, Android Studio 🔹 Backend & APIs: Python, Laravel (PHP), Node.js, .NET, RESTful APIs, Firebase, SQL, MySQL, PostgreSQL 🔹 CI/CD & DevOps: Bitrise, Jenkins, GitHub Actions, Fastlane, Sourcetree, Git, Docker (basic), Firebase Crashlytics 🔹 Architecture & Methodologies: MVVM, MVI, VIPER, Clean Architecture, Agile (Scrum, Kanban), SDLC, Secure Development Lifecycle 🔹 Security & Compliance: End-to-End Encryption, GDPR, PCI-DSS, PSD2, Data Masking, Secure Storage, Role-Based Access 🔹 Project & Collaboration Tools: Jira, Confluence, Bitbucket, GitHub, Slack, Trello ✔ Whether you need a full app, an AI-powered feature, or a trusted technical lead, I’m here to help you launch with confidence.✔ Best Regards, 𝐅𝐚𝐡𝐚𝐝 𝐈𝐪𝐛𝐚𝐥 Full Stack Engineer, Django, AI Full Stack Engineer, Full Stack Programmer, Python, Full Stack Developer, Full Stack Specialist, Full Stack Python Developer, Full Stack Django Developer, Full Stack Django Developer, Fractional CTO, Python, JavaScript, Django, Full Stack Mobile App Developer, Full Stack Engineer, AI Full Stack Engineer, Software Application Development, Software Engineer, Senior Software Engineer, Full Stack AI Engineer, Full Stack Python Developer, Software Engineer, Full Stack Developer, Python Engineer, Full Stack Mobile App Developer, Fractional CTO, Senior AI Engineer, Senior Solution Architect, Senior AI Architect, Fractional CTO, Senior AI Engineer, Senior Solution Architect, Senior AI Architect, Fractional CTO, Senior AI Engineer, Senior Solution Architect, Senior AI Architect, Fractional CTO, Senior AI Engineer, Senior Solution Architect, Senior AI Architect, Fractional CTO, Senior AI Engineer, Senior Solution Architect, Senior AI Architect, Fractional CTO, Full Stack Engineer, Django, AI Full Stack Engineer, Full Stack Programmer, Python, Full Stack Developer, Full Stack Specialist, Full Stack Python Developer, Full Stack Django Developer, Full Stack Django Developer, Fractional CTO, Python, JavaScript, Django, Full Stack Mobile App Developer, Full Stack Engineer, AI Full Stack Engineer, Software Application Development, Software Engineer, Senior Software Engineer, Full Stack AI Engineer, Full Stack Python Developer, Software Engineer, Full Stack Developer, Python Engineer, Full Stack Mobile App Developer, Fractional CTO, Senior AI Engineer, Senior Solution Architect, Senior AI Architect, Fractional CTO, Senior AI Engineer, Senior Solution Architect, Senior AI Architect, Fractional CTO, Senior AI Engineer, Senior Solution Architect, Senior AI Architect, Fractional CTO, Senior AI Engineer, Senior Solution Architect, Senior AI Architect, Fractional CTO, Senior AI Engineer, Senior Solution Architect, Senior AI

Hi, this is Amit Hasan I have been in the programming field for over five years, working as a Software Engineer, Full-Stack Developer, and Software Architect. I am skilled in C, C++, C#, Java, Kotlin, Python, Dart, JavaScript, TypeScript, and Swift. On the framework side, I work with Flutter, React.js, Next.js, NestJS, and Django to build modern and scalable applications. I specialize in: Mobile App Development (Android & iOS with Flutter, Kotlin, Java, Swift) Web Development (React.js, Next.js, Django, Node.js, NestJS) Backend & Architecture (Microservices, REST APIs, RabbitMQ, Redis, PostgreSQL) UI/UX Design (Mobile & Web) Currently, I work with an IT company, building full-stack solutions and leading architecture design for web and mobile projects. I have also delivered many successful freelance projects for international clients on Upwork. Coding is not just my profession — it’s my daily life and passion. I enjoy turning ideas into products and am committed to delivering clean, efficient, and high-quality solutions. I’d be happy to work full-time or part-time on your project and bring it to success.

👋 Welcome to my profile! I'm Asif, a seasoned Android application developer with a passion for crafting user-friendly and innovative mobile experiences. With over 5 years of hands-on experience in the field, I have honed my skills to deliver top-notch solutions tailored to meet my client's needs. 📱 Throughout my career, I have successfully developed a diverse range of Android applications, spanning various industries including finance, healthcare, and gaming. My expertise lies in building robust and scalable applications from scratch, as well as optimizing existing codebases for improved performance and user satisfaction. 💡 One of my key specializations is in publishing apps on the Google Play Console. I am well-versed in the platform's intricacies and adept at navigating the submission process efficiently. From initial setup to app listing optimization and ongoing maintenance, I ensure your app meets all requirements and stands out in the crowded marketplace. 🔧 Here's what I bring to the table: **Proficiency in Java/Kotlin programming languages and Android SDK **Strong understanding of mobile UI/UX principles **Experience with RESTful API integration and third-party libraries **Unit-test code for robustness, including edge cases, usability, and general reliability **Thorough knowledge of Google Play policies and best practices **Work on bug fixing and improving application performance **Commitment to delivering high-quality, bug-free code on time and within budget 🌟 Client satisfaction is my top priority, and I strive to exceed expectations with every project I undertake. Whether you're a startup looking to launch your first app or an established business seeking to enhance your mobile presence, I'm here to help you achieve your goals. 💬 Ready to bring your Android app idea to life? Let's connect and discuss how we can turn your vision into reality!