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✅ .NET Full Stack Developer 20+ years of experience ✅ Build powerful .Net solutions that drive business growth ✅ C# .Net developer with 15+ years of experience ✅ Developed 50+ applications ✅ Crafted 200+ user-friendly interfaces that drive real business results. The clients say "It doesn't feel like outsourcing, but instead like we have our own remote developers." "They had great soft and hard skills and were full of ideas and drive!" I lead the fullstack and mobile development team at Itexus, a professional software development and consulting company focused on Fintech, Insurance, Healthcare, etc. I have 20+ years of experience in the .net architect development of web and mobile applications, .net, python, node.js, java developer as well as javascript, react .net, angular, AI frameworks and libraries. 👨‍💻.NET Full Stack Expertise .NET full stack – strong background in End-to-end development from database to UI using Microsoft stack .NET Core – deep expertise, cross-platform backend services .NET Angular – Full stack development on .NET backend and Angular frontend for enterprise-grade solutions .net core angular – Building complete systems with seamless backend–frontend integration .NET Core Angular – Scalable and secure web apps using .NET Core and Angular Angular .NET solutions – Using Angular for UI and .NET for API and business logic .net core developer – Proven experience delivering high-performance backend solutions using .NET Core .net core react – Building robust, scalable web applications with .NET Core APIs and React frontends c# .net developer – End-to-end development expertise using C# and the .NET ecosystem c# .net core – Advanced solutions built on C# with .NET Core for modern, cross-platform applications 👨‍💻 BACKEND Development Python: Expert in Python for server-side development Frameworks: Proficient in Django and Flask for building web applications Databases: Skilled in SQL, PostgreSQL, MySQL, and MongoDB for efficient data management Architecture: Experienced in applying MVC patterns for scalable applications APIs: Capable of integrating external services through REST and GraphQL 👨‍💻 FRONT END Development Proficient in HTML5, CSS responsive, JavaScript Experienced in React.js, Angular, Vue.js, react native, ionic, xamarin developer Responsive, cross-browser, ui/ux designer, ux/ui dashboard, ui ux designer app 👨‍💻AI TOOLS OpenAI API, DeepFace, ML/DL frameworks (TensorFlow, Keras, PyTorch, Scikit-learn), LangChain, Mistral, AgenticAI, Transformers RAG + custom AI tools: Document recognition and processing, Market Grabber, project management bots, AI for telephony, video/audio analysis Mobile App Development Native Mobile Development: Android, Kotlin, Java, iOS, Swift, KMP, KMM. Cross-Platform/Hybrid App Development: Flutter, Swift, Objective C, React Native, Xamarin, MAUI. General Expertise Website & Full Stack Development: Full stack development with ai .net full stack developer, .net software engineer, .net programmer, full stack developer, ai python full stack developer django, full stack web developer, full stack development, cms developer DevOps/DevSecOps: AWS, Azure, Docker, Kubernetes, GitLab-CI, Ansible, Terraform, etc Cross-platform app building with three.js, web application design, webflow web designer, website builders Integration tools: Data integration, websockets, ABP Framework, discord, Autotask Experienced in .net core web api, fullstack .net developer roles, with strong skills as a .net specialist. Skilled angular .net react developer, java developer with solid c sharp expertise. Worked on kogito for business automation, delivered ui ux-focused solutions. As an azure data engineer, handled scalable data pipelines. rust developer, python projects include backend developer tasks. Built app as a xamarin and web developer using java and javascript. Skilled in postgresql and web scrapping. Maintained legacy systems with .net webform. Collaborated with nft marketers, managed nft collab manage tasks. Full stack with react nodejs, modern react, including react typescript, react native developer roles. Acted as product owner in agile teams. Cloud deployments done on azure. Built interactive UIs using blazor. Why Choose us Microsoft certified talented developers and senior .net developer team High QA standards, including qa engineer roles Modern solutions: NFT programmer, metaverse, Microsoft .net, windows 10, Power Apps developer, SharePoint, market grabber Scalable team: full stack software developer, front end programmer, ios developer, ui ux designer Industries Banking, Trading, Cryptocurrency, Asset Management, Lending, Retail, Real Estate & Property Management, Food Delivery, Entertainment, Hospitality, Construction, Sports & Fitness, Travel & Tourism, Wellness, Medical Dashboard, Marketplace, E-commerce, Automotive, Human Resources, Education, E-learning, AI Assistants Seek new projects to put our .net ai, bring value to individuals, startups, companies.

If your .NET system is slow, unstable, hard to maintain, or blocking business growth - I fix that. I help businesses rescue, modernize, and scale legacy .NET applications without disrupting ongoing operations. Let’s discuss your project today — I’ll review your current setup free of cost and suggest a practical, scalable plan before we even start. Most of my clients reach out when: - Their legacy system is crashing, slow, or insecure - Developers left and nobody understands the code - Compliance audits (HIPAA / PCI-DSS) are failing - The system can’t scale with users or business demand - They want to modernize without a risky full rewrite With 8+ years of experience, I’ve helped companies in Healthcare, FinTech, ERP, POS, and HRMS turn fragile legacy systems into secure, cloud-ready platforms used by thousands of users daily. ✅ What I Can Do for You - Stabilize and refactor legacy .NET / ASP .NET applications - Modernize WebForms or MVC apps into clean, scalable architectures - Migrate systems to .NET Core / .NET 6–8 and Azure - Fix performance bottlenecks and security vulnerabilities - Design compliance-ready systems (HIPAA, PCI-DSS, HL7/FHIR) - Build new systems the right way using Clean Architecture I have worked on various projects for clients across different industries and sectors, delivering solutions that meet their needs and expectations. I have a strong knowledge of Sitecore architecture, features, modules, tools, and APIs, as well as other web development technologies such as .NET (MVC),.Net Core, C#, HTML, CSS,bootstrap,DevExpress,Angular,Jquery, JavaScript, SQL Server, React, Next.js, etc. Why work with me? 💕Reliable & Accountable -- Consistently deliver on commitments, meet deadlines, and maintain a high standard of work. 💕Strong Technical Breadth & Depth -- Experienced with modern frameworks (React/Next.js, Node.js/.NET), scalable APIs, and both SQL/NoSQL databases. 💕Clean, Maintainable Code -- Focus on clarity, modular structure, and long-term maintainability. 💕Problem-Solving Mindset -- Able to diagnose issues quickly and implement efficient, effective solutions. 💕Collaborative & Communicative -- Work effectively with cross-functional teams and communicate clearly with technical and non-technical stakeholders. 💕Fast Learner & Adaptable -- Stay current with new technologies and best practices to keep systems modern. #DotNet #SeniorDeveloper #ASPNetMVC #AngularJS #EntityFramework #SQL #MySQL #API #ArtificialIntelligence #WindowsForms #DevExpress #SSRS #SAPCrystalReports #GitScrum #Jira #Trello #AndroidThings #iOS #WebDevelopment #DesktopApplications #FullStackDeveloper

⭐⭐⭐⭐⭐ "𝘞𝘦 𝘸𝘦𝘳𝘦 𝘷𝘦𝘳𝘺 𝘩𝘢𝘱𝘱𝘺 𝘸𝘪𝘵𝘩 𝘵𝘩𝘦 𝘨𝘳𝘦𝘢𝘵 𝘸𝘰𝘳𝘬 𝘲𝘶𝘢𝘭𝘪𝘵𝘺 𝘈𝘯𝘯 𝘱𝘳𝘰𝘷𝘪𝘥𝘦𝘥 𝘢𝘯𝘥 𝘵𝘩𝘦 𝘕𝘢𝘵𝘪𝘧𝘦 𝘔𝘰𝘣𝘪𝘭𝘦 𝘵𝘦𝘢𝘮. 𝘐𝘧 𝘸𝘦 𝘳𝘦𝘲𝘶𝘪𝘳𝘦 𝘢𝘯𝘺 𝘸𝘰𝘳𝘬 𝘢𝘨𝘢𝘪𝘯, 𝘸𝘦 𝘸𝘪𝘭𝘭 𝘥𝘦𝘧𝘪𝘯𝘪𝘵𝘦𝘭𝘺 𝘶𝘴𝘦 𝘵𝘩𝘦𝘮." 🤝 𝐈 𝐜𝐨𝐝𝐞, 𝐚𝐝𝐯𝐢𝐬𝐞, 𝐚𝐧𝐝 𝐜𝐚𝐫𝐞 𝐟𝐨𝐫 𝐲𝐨𝐮𝐫 𝐩𝐫𝐨𝐝𝐮𝐜𝐭 𝐥𝐢𝐤𝐞 𝐢𝐭’𝐬 𝐦𝐢𝐧𝐞 𝐟𝐫𝐨𝐦 𝐭𝐡𝐞 𝐬𝐭𝐚𝐫𝐭. 👋 Hi! I’m Ann an Android & iOS mobile app developer Swift Kotlin mobile app development expert with 8+ years of experience building high-performance iOS apps, Android apps, and scalable cross-platform solutions with React Native. 🚀 Android & iOS Mobile App Developer | Swift • Kotlin • React Native | Mobile App Development As a Top Rated Plus Android & iOS mobile app developer Swift Kotlin mobile app development specialist on Upwork with 30+ five-star reviews and a 100% Job Success Score, I’ve helped 60+ companies and startups transform ideas into scalable, future-proof mobile products. Whether you need a native iOS app with Swift, a native Android app with Kotlin, or a cross-platform solution, I deliver Android & iOS mobile app development using Swift and Kotlin with precision, creativity, and enterprise-grade quality. From e-commerce, fitness, and healthcare to fintech, streaming, logistics, and wearable apps, my experience as an Android & iOS mobile app developer Swift Kotlin mobile app development professional spans 15+ industries and 50+ published apps. ✅ Why Partner with Me as Your Android & iOS Mobile App Developer: 8+ years of hands-on Android & iOS mobile app development using Swift, Kotlin, React Native 50+ successful iOS and Android apps delivered in Fitness Mobile App (Coaches, Gyms & AI Meal Plans) 10+ successful iOS and Android apps delivered in Fintech industry A strong mobile app development team of 50+ experts 100% Job Success Score and consistent 5-star reviews on Upwork Streaming, TV apps GPS and Map-based apps ( GPS trackers, MapBox, Google Maps integration) AI Mobile App Development MVP App Development for Wellness and Hospitality Platform Dating Mobile App Social Media App Development Mental Health Social Platform Enhance an Android, IOS mobile apps Figma designer. UX/UI designer Real Estate mobile apps Full-cycle Android & iOS mobile app development — from idea to App Store & Google Play launch AI App Expert specializing in Swift Kotlin mobile app development, on-device ML, real-time image & text processing, and LLM API integrations 🔧 Services I Provide as an Android & iOS Mobile App Developer (Swift & Kotlin): Native iOS app development with Swift & SwiftUI Native Android app development with Kotlin & Jetpack Compose Android & iOS mobile app development using Swift Kotlin architecture React Native app development for cross-platform solutions UI/UX design for iOS and Android apps (Figma, Sketch, Adobe XD) Secure API integrations & cloud services (AWS, Google Cloud) Scalable backend connections & microservices Wearable app development (Apple Watch, Wear OS, Bluetooth) Performance optimization & offline-first mobile app development 🎯 Industries I Specialize In as an Android & iOS Mobile App Developer (Swift Kotlin): 📦 E-Commerce | 🍔 Food & Drink | 📚 Education 💪 Health & Fitness | 💘 Dating | 🎬 Entertainment & Streaming 💼 Finance & Banking | 🌍 Travel | 📱 SaaS Platforms ⌚ Wearables & IoT | 🚚 Logistics & Booking Apps All powered by Android & iOS mobile app development with Swift and Kotlin. 🚀 Advanced Features I Build with Swift & Kotlin Mobile App Development: ✔️ Social login (Google, Apple, LinkedIn) ✔️ Real-time chat, WebRTC video calls & push notifications ✔️ Offline mode & smart data synchronization ✔️ GPS, geolocation, Bluetooth & geofencing ✔️ ARKit & advanced AR features ✔️ Firebase & cloud integrations ✔️ Monetization (AdMob, Meta Ads) ✔️ Voice assistants (Siri, Google Assistant, Alexa) ✔️ TV apps (tvOS, Android TV) & wearable tech (Garmin, Monkey-C) 💬 Why Choose Me as Your Android & iOS Mobile App Developer (Swift Kotlin): I bring deep expertise in Android & iOS mobile app development using Swift and Kotlin, focusing on clean architecture, scalability, performance, and business impact. Whether you’re a startup building an MVP or an enterprise scaling globally, I’m the Android & iOS mobile app developer Swift Kotlin mobile app development expert who can turn your vision into a successful product. 📱 Let’s connect and build a powerful Android & iOS mobile app with Swift and Kotlin. 🚀 Your trusted Android & iOS mobile app developer Swift Kotlin mobile app development partner is just one click away. UPD: 05.06.2026

• Also known as Windows and macOS App Developer Expert • 5+ years of experience • I work on backend, frontend, databases, and Linux server administration • Main stack: .NET (C# / Visual Basic) and TypeScript / JavaScript • I build web and multi-platform desktop/mobile applications 📚 Technologies • My main tech stack is .NET (C# or Visual Basic .NET) and TypeScript / JavaScript • For .NET, I work with ASP .NET, Blazor, WPF, Windows Forms, MAUI (formerly Xamarin), Avalonia UI, and more • For TypeScript / JavaScript, I prefer React, but I can also work with Angular, jQuery, or vanilla JS • I can also develop macOS and iOS apps using Swift and Objective-C 🗼 Server Administration and DevOps • Familiar with Debian-based Linux distributions like Ubuntu • Able to handle VPS baremetal or Docker-based setups • Able to automate workflows using Bash, Python, GitHub Actions, and similar tools • Experienced with cloud services such as AWS and Azure 📊 Database • Microsoft SQL Server • MySQL / MariaDB • SQLite • PostgreSQL • Microsoft Access 💡 Skills • Strong in algorithm design and analysis • Great ability to solve programming and system trouble • Great at optimizing software performance • Flexible work style • Adaptive team player 📖 Self-Update • I regularly study new technologies to stay up to date. 🕰️ Flexible Availability • Open to collaborate across multiple time zones (US, CA, UK, EU, APAC, etc.) ✅ I’m not a robot. • I’m a real human and a solo freelancer, not an agency 🙌 Let’s Connect! • My name is Junian and I’d love to help bring your ideas to life • Feel free to reach out so we can discuss how I can support your project • Not a Vibe Coder, but use AI-Assisted Programming tools to solve problems • Linus Torvalds once said, “Talk is cheap. Show me the code.” So go ahead and check out my GitHub code. 🛠️ Common Tasks and Roles • Known as the Apple / macOS / iPhone guy • Build Windows app with .NET Framework & Windows Forms (WinForms) / Windows Presentation Foundation (WPF) / WinUI / Avalonia UI / MAUI / Xamarin • Build Windows Installer MSI / EXE from existing Windows App by using Wix / WixSharp • Build macOS app with Swift UI or .NET & Avalonia UI / MAUI / Xamarin • Build, sign, and notarize macOS app installer (PKG / DMG / ZIP) • Build web app with ASP .NET & Blazor / React / Angular / Vanilla JavaScript • Deploy and configure existing web apps by using Docker container to VPS / Cloud providers like AWS, Azure, or GCP • Ethical decompile / reverse engineer / source code retrieval / deobfuscation of existing .NET EXE / DLL / MSI or NinjaTrader Trading Indicator / strategy • Automate Windows UI tasks • Web scraping to retrieve online data / PDF / Images / any other files • Expert macOS system and app troubleshooting 🙋‍♂️ What I'm not • I'm not a Vibe Coder. Don't get me wrong, I use AI to build software, but I don't solely rely on it.

🏆 TOP RATED | ⚡ 10+ years in Mobile App Development | 📱 20+ shipped iOS & Android apps | 🧠 AI, BLE & Computer Vision Flutter Developer & Mobile App Developer with 10+ years in Mobile App Development and Mobile App Design - I build production Flutter apps for iOS and Android that real users rely on daily, backed by solid Full Stack Developer expertise. As a Mobile App Developer, I cover the full product lifecycle - from architecture and Mobile App Design to backend integration, App Store / Play Store release, Mobile App Redesign, and Mobile App Bug Fix. Over 10+ years, I delivered 20+ mobile applications as a Flutter Developer, React Native Developer, and Mobile App Developer across healthcare, fintech, fitness, and e-commerce. 🚀 FLUTTER DEVELOPER - iOS & ANDROID Flutter Dart is my primary stack for Flutter Mobile App Development. I build production Flutter apps used by real users every day. My Flutter Firebase expertise covers 10+ projects with full backend integration. I implemented payment flows with Stripe and RevenueCat in 5+ Flutter apps, and built real-time features using WebRTC and Firebase Cloud Messaging. As a Full Stack Flutter Developer, I deliver complete App Development solutions - from Flutter front-end to backend integration, including API Integration and User Profile Creation flows. 📱 MOBILE APP DEVELOPER - iOS & ANDROID As a Mobile App Developer with 10+ years of Mobile App Development and Mobile App Design experience, I work across Flutter, React Native, iOS Swift, Android Kotlin, and Native App Development. I have shipped apps to the App Store and Google Play, including projects with BLE, ARKit, image processing, and real-time geolocation. Hybrid App Development, iOS Development, and Android App Development - I handle all platforms. Every project includes solid API Integration to connect mobile with backend services seamlessly. Skills I apply on every project: Kotlin, Swift, Dart, Firebase, REST API Integration, Mobile App Redesign, Mobile App Bug Fix, Hybrid App Development, Native App Development, User Profile Creation. ⚛️ REACT NATIVE DEVELOPER Before specializing as a Flutter Developer, I worked as a React Native Developer building cross-platform apps. React Native Firebase, React Native Mobile - I can honestly advise whether Flutter or React Native fits your project better. For simpler Hybrid App Development projects, I also have Ionic Framework and Ionic Angular experience. 🌐 FULL STACK DEVELOPER - BACKEND & WEB Almost every serious Mobile App Development project needs a web layer. As a React Developer and Next.js Developer, I build admin dashboards and landing pages in-house. As a Full Stack Developer, I have built backends using ASP.NET Core, Node.js, PHP Laravel, and Go across 15+ projects. PostgreSQL, Redis, MongoDB, Firebase - I choose the right database. Payments with Stripe and RevenueCat, push notifications with Firebase Cloud Messaging. 🎯 AI & COMPUTER VISION IN MOBILE APPS I stand apart by integrating AI and Computer Vision directly into Flutter apps. At Allimb, I supervised a team of AI engineers, bridged Python pipelines with TensorFlow Lite models, and shipped real-time on-device CV inference inside a Flutter app - something most Mobile App Developers cannot do. If your App Development project involves machine learning or on-device AI, I handle it entirely in-house. ✅ WHAT YOU GET Honest estimates. Clear communication. No promises I cannot deliver. 10+ years as a Flutter Developer, Mobile App Developer, React Native Developer, and Full Stack Developer - all focused on one thing: shipping apps that work.  I am not a WordPress developer. Your Mobile App Developer - Volodymyr

Specializing in C#, .NET Ecosystem, Hardware Integration & Office Automation If you are looking for a developer who can bridge the gap between sophisticated web interfaces, high-performance desktop systems, and physical hardware—you are in the right place. With 12+ years of experience, I architect "mission-critical" solutions designed for longevity, whether they live in the cloud or on a local workstation. ⭐ "Subhodeep is an excellent programmer... Clean code, in sync with architecture." ⭐ "I am very impressed by Mr. Bhattacharjee's professional programming skill... Very satisfied and thankful." 🔹 Why I am the Top Choice for Your Project While many developers specialize in only one area, I offer a unified approach to the Microsoft stack. My solutions are famous for their longevity—many of my enterprise applications have been running glitch-free for 12+ years in high-pressure production environments. I provide the stability of a desktop expert with the modern flexibility of a web developer. 🛠 Technical Arsenal 1. Enterprise Web Development Modern Core: Architecting scalable web apps using ASP.NET Core and MVC. Frontend Mastery: Creating responsive UIs with React, JavaScript, and jQuery. Legacy Support: Maintaining and modernizing ASP.NET WebForms applications. 2. Advanced Windows UI/UX Development WPF (MVVM): High-performance, modern interfaces with complex data binding. WinForms: Legacy-to-modern migrations and rapid, stable business tools. Enterprise Toolkits: Expert-level implementation of DevExpress and Telerik. MAUI: Extending desktop power to cross-platform mobile environments. 3. Hardware & Industrial Integration Communication: Deep mastery of TCP/IP, RS-232, and Serial Port protocols. Peripherals: Seamless integration for RFID Readers, Barcode Scanners, and industrial sensors. 4. Microsoft Office Automation (VSTO) Custom enterprise-grade Add-ins for Excel, Outlook, Word, and PowerPoint. Creating seamless bridges between Office tools and internal databases. 5. Data Architecture & Smart Logic Databases: SQL Server, SQLite, and Entity Framework (Core & Full). Data Processing: Complex CSV, XML, and JSON manipulation at scale. ✅ The Guarantee of Senior-Level Engineering Zero Technical Debt: I write clean, maintainable code using SOLID principles. Full-Stack Ownership: From hardware handshakes and database design to the final Web API or Desktop UI. Architectural Precision: Focused on memory management, speed, and Windows API optimization. 🚀 Stop looking for multiple freelancers. Whether you need to digitize your entire operation, build a React-based dashboard for your desktop tools, or solve a complex hardware-software conflict, I will deliver a robust, future-ready solution. Let's discuss your project today!