I am committed and dedicated to my works and to my clients. My rules are i) Client satisfaction is the key to success, ii) Design everything before implementation and iii) Write good code with proper documentation. But I believe in exception and every rule has an exception. I have 17+ years of experience with C++/Qt/QML/Felgo, C#/VB/.NET/Xamarin/MAUI/Avalonia/iOS/Android, etc. I do also code in Node.js, Go, Rust and MongoDB for server/backend and API stuff. I have also achieved the 'Digia Certified Qt Developer' and 'Digia Certified Qt Specialist' certifications.

I am an ACM-ICPC World Finalist and software engineer. I have been developing backend and DevOps solutions using C++, Java, and Python since 2016. I have experience in multiple domains that include fintech, agrotech, health tech, IoT, and Saas. I have been working as a remote developer with globally distributed teams since 2019. I am a quick learner, good with communication, proactive and punctual human being. Nothing excites more me than a challenge that is necessary but difficult to solve. I am also a competitive programmer and expert in data structures and algorithms. I have a decent understanding of UNIX systems especially how different types of data structures are blended to solve complex problems of operating systems. I am a team player and can work as solo as well. I never compromise the quality of my work doesn't matter how the pressure is. And, I believe in requirement analysis as the most crucial part of engagement.

I am a software developer with 16 years of experience in C++ and Java programming and over 11 years of expertise in Android Open Source Project (AOSP) development. I have a deep understanding of Android architecture, system component modifications, and creating custom AOSP-based solutions including secure hardened ROMs and deniable encryption solustions such as mobiflage I have experience in Android application development, building scalable, user-friendly apps with a focus on performance and reliability. Experience with background in FFmpeg and GStreamer, leveraging these technologies for multimedia processing and streaming solutions. My work with Sunshine and Moonlight-qt, open-source streaming platforms, highlights my ability to deliver high-quality remote desktop and game streaming solutions.

Are you ready to start working with me? I’m not just a programmer. I take the time to understand your business domain, how your processes actually work, and what your users need. This allows me to create a strong connection between your business requirements, our collaboration, and the software we build. For 17+ years, I’ve been building software professionally, including 13+ years working on real products across multiple companies and industries — from ERP and education to monitoring, healthcare, SaaS, and enterprise systems. I’ve worked on products throughout their lifecycle — understanding business requirements, designing architecture, writing code, integrating systems, optimizing performance, fixing legacy problems, and continuously improving software used by real businesses and users. At the same time, I’ve built a strong freelance career, delivering 66+ successful software projects worldwide and maintaining a 100% Job Success Score on Upwork. My clients have consistently been satisfied with the results, and many projects have grown into long-term cooperation. This combination gives me two perspectives that are valuable to my clients: As a product engineer, I understand what it means to work on a product every day, deal with real users, business processes, technical debt, architecture, and long-term product evolution. As a freelancer, I understand that your time and money matter. I take responsibility for understanding the problem, communicating clearly, and delivering a solution that actually works for your business. How I Work With Clients ⭐ I don’t simply wait for specifications — I dive into the business domain and ask questions when something doesn’t make sense. ⭐ I provide a transparent real-time development process with active Kanban tasks, planning, progress tracking, and continuous communication. ⭐ You can always understand what I’m working on now, what is planned next, and how the product is progressing. ⭐ I use AI-powered development tools for research, coding, debugging, refactoring, documentation, and problem-solving to make development faster and more efficient. Why Clients Hire Me ⭐ 17+ years of professional software development experience ⭐ 13+ years working on real products across multiple companies and industries ⭐ 66+ successful freelance projects delivered worldwide ⭐ Top Rated Upwork Developer with a 100% Job Success Score ⭐ Senior C# / .NET Full Stack Developer experienced in SaaS, enterprise software, ERP systems, complex business logic, and legacy modernization ⭐ Experience building and maintaining software used by 250,000+ users ⭐ Led development for enterprise SaaS platforms with 20+ engineers ⭐ Reduced page load time from 30 seconds to 1 seconds ⭐ Reduced deployment time from several minutes to under one second ⭐ Optimized high-load systems and reduced infrastructure costs by 66% ⭐ Strong expertise in software architecture, backend, frontend, databases, cloud integrations, and system optimization My goal is not simply to write code that matches a specification. My goal is to understand your business, your product, and the problem we are solving — and then work with you to build the right solution. Full Stack .NET Development Services SaaS Development • Full Stack SaaS Development • Senior .NET Developer for startup MVPs and enterprise platforms • Multi-tenant SaaS architecture • REST APIs • Authentication & Authorization • Subscription systems • Admin dashboards • Cloud-ready applications Full Stack Development • Full Stack .NET Development • C# Development • ASP.NET Core • Blazor Server • Blazor WebAssembly • Razor Pages • SQL Server • Entity Framework Core • JavaScript • HTML • CSS • API integrations Software Engineering • Software Architecture • System Design • Domain-driven application design • Performance optimization • Refactoring • Code reviews • Technical leadership • Scalable software solutions Legacy Modernization • ASP.NET WebForms → ASP.NET Core • WinForms → Blazor • .NET Framework → .NET • ASP.NET MVC → Razor Pages • Database modernization • Performance optimization • Cloud migration Desktop Application Development • WinForms • Windows Services • Enterprise desktop software • Background services • Hybrid desktop/web solutions Workflow Discovery • Analyze business requirements • Review existing systems • Define scalable architecture Architecture • Design maintainable software • Define service boundaries • Choose appropriate technologies • Plan long-term scalability Development • Senior C# Development • Full Stack Engineering • Backend development • Frontend development • API integrations • Database design • Third-party integrations Optimization • Performance tuning • SQL optimization • Memory optimization • Infrastructure optimization • Cost reduction Technologies C# .NET ASP.NET Core Blazor Blazor Server Blazor WebAssembly Razor Pages Entity Framework Core SQL Server JavaScript TypeScript HTML5 CSS3 REST API Microservices Azure WinForms

Top 1% Upwork specialist in AI & Embedded Systems. I architect and build solutions using LLMs, CV, and C++/Qt on Nvidia Jetson. My focus is turning your ambitious vision into a reliable, high-performance product. As a Georgia Tech graduate with over 10 years of hands-on experience, including foundational work in the autonomous driving sector of German automotive industry, I partner directly with clients to solve their toughest technological challenges. I am committed to writing clean, efficient, and test-driven code, ensuring your project is built for scalability and long-term success. Here's where my expertise lies: ✅ Intelligent AI, LLM & Agentic Systems Generative AI & LLMs: I architect advanced solutions using the OpenAI API, Gemini, Llama 3, and custom models, specializing in Retrieval-Augmented Generation (RAG) for powerful, context-aware applications. Agentic AI: I build autonomous AI agents that can reason, plan, and execute complex tasks. Full-Stack ML: I manage the entire machine learning lifecycle, from data processing and model training (YOLO, TensorFlow, PyTorch) to robust deployment. ✅ High-Performance Computer Vision (CV) Algorithm Optimization: I have proven experience in optimizing state-of-the-art detection, tracking, and stereo vision algorithms for maximum performance on edge devices. OpenCV, NVIDIA Jetson & DeepStream: My expertise includes deploying real-time vision applications using the complete NVIDIA toolkit, including FFMPEG, GStreamer, TensorRT and DeepStream. ✅ Robust Embedded Systems & Software C++ & Qt Development: I craft high-performance, cross-platform applications with clean C++ and the Qt framework. Embedded Linux & Hardware: I am highly adept at developing for a wide range of platforms, including ROS, Nvidia Jetson, STM32/STM32MP1, Raspberry Pi, and BeagleBone. Protocol Specialist: I have worked on numerous communication protocols like CAN, CANFD, SomeIP, TAPI, Flexray, RSMP, BACnet, OPCUA, MQTT, TCP/IP, UDP/IP, RSTP, ONVIF and many others. When you hire me, you are partnering with a dedicated, top-rated expert who is personally invested in delivering results.

25+ years in Software Development Available for 40-60 hrs./wk. Excellent references from CEOs of the companies. Bringing products to market: inception, spec, architecture, implementation, testing. Seeking for software development projects in the following areas on Windows Platforms: - Recent successful GPT-3/3.5/4 API experience with C#, DALL-E interface, and OpenAI Whisper. - Experience of developing RAG Web Service enabling chatting with private corpus of documents, based on Azure Cognitive Search SDK, Azure OpenAI API and Azure Cosmos Vector DB for vector, hybrid, and semantic search. Segmenting Word/PDF/Excel/CSV/Text documents, embeddings, and ingestion. - Worked with ML.NET in VSTO Outlook Add-In environment for email classification. - Experience with Text-To-Speech and Speech-To-Text using AWS, Azure, Google, Eleven Labs, and other vendors. Experience with Google Voice Services, including Diarization (recognition of different speakers and designation in the transcript), and Medical Transcription. Able to produce STS (Speech-to-Speech) application - interacting with ChatGPT over microphone and speakers. Recent Development Experience of TTS with OpenAI. - AI Training of basic GPT models using fine-tuning, and embedding techniques with vector databases, such as Pinecone, Qdrant, and Milvus APIs. - OpenAI Completion and Embeddings API, GPT-3/3.5/4, Whisper API for Transcribing and Translation - Azure Semantic Kernel, Azure Data Explorer (ADX), Azure Blob Storage, Azure Analytical Services. - AWS Text-To-Speech, AWS Storage - Web Services: REST-API, ASP.NET Framework and Core, WCF Web Services, Microservices - Azure Active Directory Authentication from Desktop Applications in C# - Desktop applications with C#/.NET Framework/.NET Core, WinForms, WPF, DevExpress - Microsoft Office VSTO/COM Add-Ins for Outlook, Excel, Word, and PowerPoint - Client/Server Systems: Sockets and high-level protocols, such as HTTP, FTP, MQTT - Windows Services - Microsoft Dynamics 365 - Hardware Interface: USB/RS232/RS485 Technologies and Frameworks: - Languages: C#, C/C++, Python, MicroPython, XML, JSON - Databases: SQL, SQLite, MySQL, Entity Framework 6/Core and LINQ. - Networking: Sockets (.NET and Winsock), REST API, WCF, HTTP, FTP, MQTT, packet-level TCP/IP, - Serial (RS232/RS485), MODBUS. - IDE: Visual Studio 2010 through 2022 - Office Add-Ins: VSTO Add-ins for Outlook, Excel, Word, PowerPoint. Add-In Express Framework. - VOIP: PJ SIP Stack with DBUS, Asterisk, Open Phone Abstract Library (OPAL) - Active Directory/LDAP/ADSI - Monte Carlo Simulations in C# - Linux: C/C++ and Python with MQTT Development on Ubuntu and Raspbian. - AES256 Encryption, Monte-Carlo Simulations, SHA256, PGP/GnuPG PKI (Public Key Infrastructure) Application binaries signing (Authenticode), Security Certificate generation in code based on CA. - Installers with Advanced Installer, Deployment strategies. - Product Licensing

I specialize in desktop, embedded, web, and mobile software development, with a strong focus on Qt C++ systems, cross-platform applications, and hardware integration such as RFID, sensors, and custom devices. With 25+ years of experience, I deliver end-to-end software solutions across desktop, embedded, web, mobile, backend, and integration layers. I usually work on complete systems where reliability, maintainability, and long-term ownership are important. Core Expertise • Desktop Applications: Qt C++ / QML on Windows, Linux, macOS • Embedded & Hardware Integration: RFID, sensors, custom devices • Web Development: ASP.NET Core, APIs, databases, admin dashboards, backend systems • Mobile Development: Android/iOS apps, cross-platform mobile integrations • Backend & Integrations: REST APIs, databases, TCP/IP, third-party services • Cross-Platform Systems: Windows, Linux, Android, iOS • Project Ownership: Architecture, implementation, testing, deployment, delivery Technologies & Tools • Qt C++, Qt QML, PyQt • C++, C#, Python, ASP.NET Core, WPF, WCF • Web APIs, backend systems, admin panels, database-driven applications • Socket programming, TCP/IP, multithreading, Windows services • Windows API / SDK, MFC, COM, ActiveX • Databases: MySQL, MS SQL, MariaDB, SQLite, ODBC • Embedded: Atmel Studio, Microchip Studio Strengths • Building reliable, maintainable, long-lived systems • Strong desktop, embedded, web, and mobile system integration experience • Strong analytical and problem-solving skills • Clear communication and independent execution • Full ownership from architecture to final delivery Selected Projects • RFID-based document management system • Billing and invoicing platform • Fleet tracking and management system • Automotive spectrum analyzer system • POS and pharmacy management systems • Hospital and healthcare management systems • Hotel booking and resource management system • Automotive climate control software • Embedded alarm systems • Automated greenhouse ventilation and irrigation system • Web-based business management platforms • Mobile apps connected to backend systems and hardware devices

About Me Experienced AI Full Stack Software Engineer. I build scalable, cloud-based applications combining modern web and AI technologies. I specialize in full stack development with React, Next.js, Node.js, and TypeScript. On the backend, I work with Python (FastAPI, data pipelines, AI workflows) and .NET/C# for enterprise-grade systems. I also have extensive experience with PHP frameworks like Laravel, WordPress, and Drupal, using MVC, MVVM, and other web architecture patterns to create maintainable, modular applications. I work extensively with AI and LLM systems. This includes LangChain, LangGraph, OpenAI models, Hugging Face, and custom NLP pipelines. I build RAG systems, automation workflows, and production-ready AI tools. For Python AI/ML, I use PyTorch for deep learning, YOLO for computer vision, and n8n for workflow automation and integrations. I have strong cloud and DevOps skills. I design Kubernetes clusters, CI/CD pipelines, and serverless systems on AWS and Azure, including SageMaker and Azure ML. I focus on scalable, zero-downtime deployments and reliable production architecture. Sometimes played on Geo service and Geo data science using QGIS, ArcGIS and Google map, OpenStreet, Leaflet , Heatmap and Mapbox GL and Maplibre I enjoy solving complex problems and turning ideas into efficient, maintainable systems. Clear communication and long-term collaboration are my top priorities.

15+ years of hands-on development. 50+ platforms shipped. $200K+ earned on Upwork with a 100% Job Success Score and Top Rated Plus status. I've been building .NET Full Stack applications long enough to know exactly where projects break — and how to make sure yours doesn't. As a .NET Full Stack Developer specialising in SaaS and AI-powered web applications, I don't just write code. I architect systems that connect your business logic to scalable infrastructure — and keep working when your user base grows. 𝗪𝗛𝗔𝗧 𝗜 𝗕𝗨𝗜𝗟𝗗 1. SaaS & Multi-Tenant Platform Development — Multi-tenant architecture with data isolation, white-label portals, and audit logging — Subscription billing, RBAC, scalable backends built on ABP .IO / Clean Architecture — Designed to onboard, retain, and grow users from day one 2. Legacy .NET Modernization — ASP .NET Framework → .NET Core / .NET 8 migration without breaking what works — Refactoring monoliths into microservices or modular architecture — Performance audits, SQL query optimization, and infrastructure upgrades 3. Enterprise Web Apps & APIs — ASP. NET Core MVC, REST API, GraphQL, gRPC, SOAP — Identity Server, JWT, SSO, and multi-role permission systems — SignalR for real-time features, background workers, event-driven architecture 4. CRM, Workflow & Business Automation — Custom CRMs: pipelines, drip automation, task and lead management — Document management, invoice portals, AR/AP workflows, approval flows — Integrations: Twilio, Stripe, PayPal, SendGrid, QuickBooks 5. AI-Powered Web Application Development — LLM integrations: OpenAI GPT, Anthropic Claude, Azure OpenAI — NLP pipelines: sentiment analysis, data extraction, summarization — AI-enhanced dashboards, smart search, and predictive analytics modules 𝗧𝗘𝗖𝗛 𝗦𝗧𝗔𝗖𝗞 Backend: .NET Core / .NET 8 · ASP.NET Core · C# · Entity Framework Core · Dapper · ABP. IO Frontend: Angular · React.js · Next.js · Blazor · TypeScript · JavaScript Databases: SQL Server · PostgreSQL · MySQL · MongoDB · Firebase · Redis Cloud & DevOps: Azure · AWS · GCP · Docker · Kubernetes · GitHub Actions · Azure DevOps APIs: REST · GraphQL · gRPC · SOAP · Swagger · Postman AI & Integrations: OpenAI · Claude API · Azure OpenAI · LangChain · Twilio · Stripe Architecture: Clean Architecture · DDD · Microservices · Multi-Tenant SaaS · Event-Driven As a Senior .NET Full Stack Developer, I take full ownership across: — Building AI-powered SaaS platforms from architecture to production — Legacy ASP.NET modernisation to .NET Core / .NET 8 — Scalable multi-tenant web applications with RBAC and billing — Backend API development: REST, GraphQL, gRPC, real-time SignalR — AI and LLM integration into existing or new .NET applications — Workflow automation and intelligent business process systems — Database design, optimisation, and SQL Server query tuning — Cloud deployment, CI/CD pipelines, and Azure / AWS infrastructure — Authentication: Identity Server, JWT, SSO, OpenID Connect — Payment gateway integration: Stripe, PayPal, QuickBooks — CRM, ERP, scheduling, and field operations platforms — Performance optimisation and long-term maintenance 𝗜𝗡𝗗𝗨𝗦𝗧𝗥𝗜𝗘𝗦 Healthcare · FinTech · Logistics & ERP · Real Estate · EdTech · HR & Recruitment · E-commerce · Insurance · Marketplaces Throughout my career as a .NET Full Stack Developer, I've delivered platforms across these industries — which means I already understand the compliance requirements, business logic, and scalability challenges your domain brings before the first call. 𝗕𝗘𝗦𝗧-𝗙𝗜𝗧 𝗣𝗥𝗢𝗝𝗘𝗖𝗧𝗦 ✔ Legacy ASP.NET Framework → .NET Core / .NET 8 migration ✔ Greenfield SaaS builds — multi-tenant, subscription-based, production-ready ✔ Angular / React frontends for complex enterprise business applications ✔ Azure / AWS deployment, CI/CD pipelines, SQL Server optimisation ✔ CRM, ERP, scheduling, and workflow automation platforms ✔ AI & LLM integration into new or existing .NET Full Stack applications ✔ Real-time systems using SignalR, event-driven architecture, background workers I believe a great .NET Full Stack Developer should think well beyond writing code. Understanding product strategy, user workflows, software architecture, and long-term maintainability matters as much as clean syntax. I ask the right questions before writing a single line — because most project failures are requirement failures, not code failures. I flag risks early, suggest better approaches when I see them, and deliver clean, documented, handover-ready code. Zero hand-holding needed post-launch. 30-day support included on every fixed-price project. Whether you need a Senior .NET Full Stack Developer for a new AI-powered SaaS product, a .NET modernisation project, or a scalable enterprise platform — send me a message.

Hi, I'm Arun — a highly efficient Full Stack Developer with strong expertise in both frontend and backend development. I have successfully completed over 5000 hours on Upwork, demonstrating my commitment, reliability, and proven ability to deliver high-quality solutions across diverse projects. I am an expert in major languages Python, C++, C# Working knowledge in Qt C++ Worked with ZW3D API in C++ I have knowledge in following Python web frameworks Django | Flask Worked with simulation software. I have good knowledge in following technologies also HTML | JavaScript | jQuery | AJAX | JSON |FFMPEG | WPF | Xamerin I have project experience in Raspberry Pi, Controlling GPIO pins with QT C++