Senior Windows & Cross-Platform Application Developer UWP • WPF • MAUI • Xamarin • WinForms • Bluetooth LE • IoT With 25+ years in software development, I build robust, high-performance desktop and mobile applications for the Windows ecosystem and beyond. My expertise spans the entire product lifecycle — from architecture and UI/UX to deployment — backed by hands-on experience with both waterfall and agile (Scrum) methodologies. What I Bring: deep Windows Stack Mastery: 20+ years creating production-grade apps with WPF, UWP, MAUI, Xamarin, classic WinForms and of course console applications. Bluetooth LE Specialist: Expert implementation of BLE services, GATT profiles, and device communication on Windows 10/11. IoT & Embedded: Extensive Arduino/ESP32 programming for telemetry, sensors, and consumer devices. Enterprise-Grade Quality: Delivered solutions for global leaders in telecom and energy, ensuring scalability, security, and maintainability. Technical Highlights: C# • .NET 4.8 → 8 • XAML • MVVM • WinUI 3 • Visual Studio • Git • REST/GraphQL • JSON/XML • SQL/SQLite • Unit & Integration Testing • CI/CD (GitHub Actions/Azure DevOps) • Performance Profiling & Optimization Why Hire Me? • fast, guaranteed results delivered strictly to your project requirements. • rapid, transparent communication and detailed status updates. • clean, well-documented code that your team can extend with confidence. • problem-solving mindset: I don’t just write code — I identify risks early and propose pragmatic solutions!

Looking for an experienced Game developer who can develop the game as per your requirements. I have nearly 6 years of experience in game development and I am a Senior Game Developer working on mobile and PC games for multiple gaming platforms across different genres in Unity 3D. I can also modify your existing game by integrating new features, systems, and plugins. I will develop high quality 3D games in Unity 3D with cross-platform support so you can publish your game on the platform of your choice. Experienced in game development & game design with strong expertise in creating engaging gameplay systems and polished game experiences. I am an up to date developer and use the latest AI tools to speed up development and improve iteration cycles, allowing faster prototyping and efficient delivery of features without compromising quality. Why work with me? • Have expertise in Managing your Long term Projects within Deadlines. • Can guide you from beginning to end if you are new in the games industry. • Can deliver short term project urgently. • Can make update and refactor your preexisting code. • End to end game development from idea to publishing across platforms.

Building AI-powered and SaaS applications that are faster to ship, cheaper to run, and built to scale. I'm a full-stack developer with 14+ years of experience and 21,000+ hours on Upwork. I specialize in two things: AI product development (LLM-powered apps, RAG pipelines, AI agents, GPT/OpenAI integrations) and SaaS application architecture using .NET, React/Angular, and cloud infrastructure. What sets my work apart is AI-assisted development — I leverage Cursor, Claude, and modern dev tooling to ship production-quality code significantly faster without sacrificing architecture or reliability. What I build: • AI agents, chatbots & RAG systems (LangChain, OpenAI, Claude, Vector DBs) • SaaS platforms & enterprise-grade applications • API-first & microservices architecture • Full-stack development (React, Angular, Next.js, .NET Core) • Legacy modernization (.NET Framework → .NET Core / cloud) I hold IBM certifications in RAG and Agentic AI (2026) and have delivered solutions across fintech, healthcare, real estate, and e-learning — always aligned to business outcomes. If you're building an AI product or modernizing a platform, let's talk. — Kunal

I have more than 15 years of programming experience. As a freelancer, I have broad experience: I developed web (ASP.NET, Python, PHP), desktop (C++, C#, Python — Linux and Windows) and mobile (Android — Java, C++) applications. I list here some of my jobs. C#: * clubspeed.com — a large software suite for family entertainment clubs; included C# code (80%), including CoreApi and ASP.NET Razor, plus PHP (Laravel) and Node.js code (for low-level car racing control tasks). I developed it as a team member. * qadra.com — a financial company; C# code (80%), Python (some microservices are Python/Flask based, 20% of code), AWS-hosted with Docker containers and Lambdas. I developed it as a team member. * enven.nl — implemented from scratch their non-public partners portal: ASP.NET Razor and some CoreApi endpoints. * ASP.NET website for house rentals. * ASP.NET website for remote control of a robotic device via a WebSocket connection. * Vegetable-oil plant automation desktop program (C# + WinCC). Python: * Embeddable fact-checking chat that uses the LangGraph framework to implement a customizable LLM/AI backend (OpenAI, DeepSeek, Hugging Face, or Ollama). It allows administrators to embed the component in their websites so users can ask questions about facts described in articles and verify whether facts listed in an article are true. It included agentic code and many external APIs to check facts (not just asking an LLM), and even computer vision to inspect website photos (OpenCV). Backend is FastAPI. * AI/LLM-based ad selection for a website (FastAPI and LangGraph). It processes website text or chat messages and selects ads of different types related to the content. It contains SDKs for embedding ads on many platforms, including Go, React, and plain HTML. * Polish-language training software, based on Django and LangGraph. * Many small projects: desktop scripts, web scraping (Selenium and related tools), and simple AI agents. C++: * Factory equipment monitoring system (Ubuntu Linux, custom server over TCP/IP, web interface in PHP). * Many small projects, some of which are mentioned in reviews on this profile; many are non-public. * Powerful software for automated ad submission on social networks (massive bots that send millions of messages). PHP: * 20+ websites — without CMS, with my own CMS, and with open-source Drupal, WordPress and Joomla CMSs. * Backends for Android applications. Android: * SOCKS5 proxy application that allows sharing mobile VPN with non-mobile clients via the SOCKS protocol. * Many WebView-based "business card" applications. * Dating-related applications, including erotic puzzles. Human emulation: * Spam bots — I cannot provide a specific list of such software for legal reasons. * Automatic checkout on eBay and similar websites. * PayPal automatic payments. * Data scraping, including air tickets and goods in online stores. Reverse engineering — I cannot provide a specific list of reverse-engineered software for legal reasons. * Java bytecode reverse engineering, including Android. * .NET bytecode reverse engineering. * Machine code for 32-bit and 64-bit x86 and ARM CPUs. Assembler: * High-performance cryptographic library for x86\_64 CPUs.

We are the high tech company that provides IT consultancy, software design and development as well as professional services to the following verticals: Government (Local and Central), Logistics, Tourism, Industry, Health Care, Education… with AI and Big Data applied (Computer Vision,...). We stand for quality, innovation and direct customer relationships. 1. Our mission: Our journey starts with our mission, which is everlasting. We are working as a company and serving as the standard against which we weigh our actions and decisions. - Deliver on time and qualitative services to customer and create a family of happy and satisfied customers with long-term relationship. - Develop innovative and environment friendly solution to improve the quality of education. - Provide outsourcing services in many areas such as logistics management, car parking system. - Build us as a great place to work for our employees and contractors by providing an environment of professional and personal growth. 2. Our vision: Why are we here? What do we do? We seek to partner with educational institutions committed to implementing educational best practices with fidelity to ensure all students succeed. Our vision focuses on Innovation to drive business results and support the community. We will continuously improve our products, training and services to ensure that the best practices we support are easy to implement. We will also strive to provide products and services of the highest value and the value of our products and services will build enduring customer relationships. 3. Our values: Four core values shape our employee-ownership culture and inspire our common mission and vision. - Client focus: As trusted advisors everything we do is valued by our clients. - Quality: We are proud to stand behind work quality of work we deliver. - Team work: As a family we ask for help and help when asked. - More and more: Our company was built on the idea that we could do more and more. That’s why “that’s not my job” isn’t in our vocabulary.

I work on real-time 3D applications built with Unity and Unreal Engine, focusing on games, simulations, and AR/VR systems that are intended to run reliably in production. My experience includes desktop and mobile games, immersive environments, and simulation workflows such as Microsoft Flight Simulator (MSFS). Tech stack: - Unity (C#), Unreal Engine (C++), AR/VR development, MSFS SDK, real-time simulation logic, environment and level development, networking and multiplayer systems, replication and synchronization, shader development, Niagara VFX, and performance profiling and optimization. Audio systems built with Wwise (spatial and event-driven audio). - Mobile development with Swift and Objective-C (iOS), React Native and Flutter (cross-platform). - Supporting tools and languages include Python, custom engine plugins, editor tools, and external API integration. - Target platforms include Windows, iOS, Android, desktop, and XR devices. A significant part of my work is focused on environment realism and interaction, where visuals, audio, effects, and networking must work together. This includes lighting, terrain, VFX using Niagara, shader tuning, multiplayer stability, and audio behavior that supports immersion rather than distracting from it. I also build mobile applications that act as companion tools, dashboards, or control interfaces for games and simulations, often connected to real-time systems or multiplayer backends. I prefer clear requirements, steady progress, and solutions that remain stable and maintainable over time. If you need help building, finishing, or improving a Unity, Unreal, or mobile project with multiplayer or simulation requirements, I can step in and handle it properly.

- Rust, C++, C , Zig, Python, JavaScript - ARM architecture - ARMV8, ARMV7, ARMV6 - Shell scripting - Powershell and POSIX shell - Virtualization & emulation – QEMU, VirtualBox - Kernel, OS, and firmware development – bootloaders, initrd, Linux, xv6, custom kernels - Desktop applications - Linux, Windows, MacOS - Networking - Advanced debugging reverse engineering

Core Strengths: Multi-platform full-stack development (C++, JavaScript, Swift, Kotlin, Solidity) 3D/2D rendering engine architecture (OpenGL, Vulkan, Metal) 0-to-1 product innovation with multiple patents Proven expertise in building and leading teams at top-tier companies (Huawei, Didi, Baidu, Tencent) Performance optimization and scalability Technical Skills Programming Languages: C++, JavaScript/Typescript, Swift, Kotlin, Solidity, Python  Frontend: Vue.js, React, WebGL, HTML5/CSS3, MySQL  Mobile: iOS (Metal), Android, HarmonyOS (ArkTS)  Graphics: OpenGL, Vulkan, Metal, Shades Programming, 3D Engine Architecture, AR/VR  AI/ML: TensorFlow, PyTorch, XGBoost, On-Device Inference Optimization, Agent, RAG  Blockchain: Solidity Smart Contracts, DApp Development, Cross-Chain Technology, PoS/PoW 

If you're looking for a Senior Embedded System & IoT Engineer with experience in Electronics and IoT product development, Firmware, Multi-Layer PCB design, and IoT Web and Mobile control systems, I'm here to design and built your idea into fully-functional IoT Product, from concept to MVP to Production. I have delivered 20+ Production Embedded and IoT Products in Healthcare & medicine, Agriculture, Wearable technology, security, automotive, and consumer/industrial devices. As a 𝐒𝐞𝐧𝐢𝐨𝐫 𝐄𝐦𝐛𝐞𝐝𝐝𝐞𝐝 𝐒𝐲𝐬𝐭𝐞𝐦 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫 with background in Electrical Engineering, I have helped startups, entrepreneurs, and engineering teams design, develop, and launch embedded & IoT products from PCB and firmware to dashboards. 𝐖𝐡𝐚𝐭 𝐈 𝐎𝐟𝐟𝐞𝐫: ➛ Firmware Development: Secure, optimized C/C++ firmware for various Microcontrollers and SBCs. ➛ Hardware Development & Integration: Multi-layer PCB designs in Altium/KiCad with driver integration ➛ IoT Web & Mobile Dashboards Development & Cloud Integration: Web dashboard & mobile app development with integration to BLE/WiFi/Lora IoT devices. ➛ Sensor and Actuator Integration: Seamless integration for precise data capture and reliable operation. 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: • Microcontrollers: ESP32, ESP8266, STM32, nRF51/nRF52/nRF53,nRF54/nRF91, PIC, Arduino (Nano, UNO, Mega) • Real-Time Operating Systems: FreeRTOS, Zephyr for deterministic, multi-threaded applications • Single Board Computers (SBCs): Raspberry Pi, Jetson Nano, Linux-based edge devices. • ARM Processors & SoCs: Cortex-M & Cortex-A: bare-metal & RTOS firmware, Linux kernel porting, board support and driver development. • Programming Languages: C, Embedded C, C++, MicroPython, Python, TinyML, Shell scripting, TCL • Networking & Communication Protocols: UART, SPI, I2C, CAN, MODBUS, RS-485, BLE, MQTT, LoraWan, Lora, HTTP/HTTPS, TCP/IP, WebSockets – for sensor networks and cloud/device communication. • Driver Development: Custom low-level drivers for GPIOs, ADC, DAC, PWM, Timers, RTC, AC metering ICs, Watchdog, DMA, and memory-mapped IO. • Sensor Integration: Environmental (BME280, SHT31), Motion/Position (MPU6050, ADXL345, HMC5883L), Proximity (PIR, IR), Electrical (ACS712, INA219), GPS (Ublox NEO-6M), Ultrasonic (HC-SR04), Soil Moisture, Hall Effect, heart rate, etc. • GSM/GPS & Cellutar Modules: SIM800L, SIM800C, SIM900, SIM7600X (2G/3G/4G LTE), Quectel, Ublox – AT command stacks, GNSS parsing, SMS/Call/HTTP features, and fallback logic. • Display & HMI Frameworks: TFT (ILI9341, ST7789), OLED (SSD1306), LCD (16x2, 20x4), 7/14 Segment • UI Frameworks: LVGL, Qt Creator, PyQt5/6, Squareline Studio for responsive HMI/GUI development. • PCB Design: Altium Designer, KiCAD , EasyEDA – Schematic capture, multi-layer layout, high-speed design, 3D modeling, and prototyping. • IoT Web Dashboard & Mobile App Development: Flutter-based and Custom IoT Web and mobile dashboards designed for remote monitoring and data sharing across devices. • IoT Platforms, Protocols, & Cloud Services: AWS IoT Core, Azure IoT Hub, ThingsBoard, Blynk, EMQX, and Mosquitto. • Embedded ToolChains and IDEs: PlatformIO, ESP-IDF, Arduino IDE, STM32CubeIDE, nRF Connect SDK, Visual Studio Code, with version control using Git & GitHub. • Security and Compliance: TLS/SSL, AES encryption, CRC 𝐔𝐬𝐞 𝐂𝐚𝐬𝐞𝐬 𝐈 𝐒𝐩𝐞𝐜𝐢𝐚𝐥𝐢𝐳𝐞 𝐈𝐧: 🔹 Industrial Automation: Actuator/sensor control, live system monitoring 🔹 Smart Agriculture: Environmental sensors, LoRa field monitoring 🔹 Medical and Consumer Devices: Wearables, health monitors, smart appliances 🔹 Automotive and Energy: CAN systems, GPS tracking, smart metering, BMS 🔹 ioT Connectivity: Secure cloud-integrated gateways, OTA updates 🔹 Prototyping: POC development, research kits, simulation platforms for labs 𝐖𝐡𝐲 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 𝐌𝐞? ➛ Modular systems built for performance, efficiency, and future growth. ➛ Milestone-driven development with clear planning and documentation. ➛ Proven experience with production systems. ➛ Regular updates, clear decisions, and technical ownership. ➛ Available for post-launch scaling, upgrades, and long-term evolution. Think we're a good fit for your project? Let's Chat! Hit "Invite to Job" Button or just send a Message, and let's explore how my expertise can drive your success. Your vision is my mission!

𝐌𝐨𝐬𝐭 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫𝐬 𝐛𝐮𝐢𝐥𝐝 𝐟𝐫𝐨𝐦 𝐬𝐜𝐫𝐚𝐭𝐜𝐡. 𝐈 𝐡𝐞𝐥𝐩 𝐲𝐨𝐮 𝐥𝐚𝐮𝐧𝐜𝐡 𝐟𝐚𝐬𝐭𝐞𝐫 𝐚𝐧𝐝 𝐬𝐦𝐚𝐫𝐭𝐞𝐫. I specialize in building ready-to-deploy platforms like Healthcare systems, booking apps, SaaS products, and custom business solutions - saving you time, cost, and months of development. 𝐈 𝐚𝐦 𝐚 𝐒𝐞𝐧𝐢𝐨𝐫 𝐒𝐨𝐟𝐭𝐰𝐚𝐫𝐞 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 𝐚𝐧𝐝 𝐂𝐨𝐧𝐬𝐮𝐥𝐭𝐚𝐧𝐭 𝐰𝐢𝐭𝐡 𝟏𝟐+ 𝐲𝐞𝐚𝐫𝐬 𝐨𝐟 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 𝐝𝐞𝐥𝐢𝐯𝐞𝐫𝐢𝐧𝐠 𝐬𝐞𝐜𝐮𝐫𝐞, 𝐬𝐜𝐚𝐥𝐚𝐛𝐥𝐞, 𝐚𝐧𝐝 𝐡𝐢𝐠𝐡-𝐩𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 𝐟𝐨𝐫 𝐬𝐭𝐚𝐫𝐭𝐮𝐩𝐬, 𝐒𝐌𝐄𝐬, 𝐚𝐧𝐝 𝐅𝐨𝐫𝐭𝐮𝐧𝐞 𝟓𝟎𝟎 𝐜𝐨𝐦𝐩𝐚𝐧𝐢𝐞𝐬. 👨‍💻 I specialize in building scalable, secure, and cloud-based backend platforms using C# ASP.NET Core, .NET 6/7/8, Web API, Microsoft Azure, AWS and the Microsoft .NET ecosystem, working across the full SDLC from system analysis and architecture to development, deployment, and long-term support. Main Focus: ✔ C#, .NET Framework, ASP.NET, ASP.NET MVC, ASP.NET Core ✔ WPF & Windows-based application development ✔ Blazor (Server & WebAssembly), Web API, REST & SOAP ✔ Entity Framework / EF Core, Dapper, LINQ, ADO.NET ✔ Angular (AngularJS-Angular 15), ReactJS, Next.js, JavaScript, jQuery ✔ SQL Server, MySQL ✔ CMS & E-Commerce: Umbraco, NopCommerce, Sitecore ✔ Cloud & DevOps: Azure, Docker, Kubernetes, CI/CD, DevOps ✔ Web & UI Technologies: Web Services, SOAP, XML, XSL, HTML, CSS, AJAX, DOM ✔ Best Practices & Methodologies: SOLID, DRY, Design Patterns, Agile/Scrum ✔ UI/UX & Design Tools: Figma, Illustrator, Dreamweaver, Photoshop ✔AI Integration: Automation, chatbots, LLM & NLP-based intelligent application features (OpenAI, Azure AI). 𝐁𝐞𝐲𝐨𝐧𝐝 𝐛𝐚𝐜𝐤𝐞𝐧𝐝 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭, 𝐈 𝐢𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐞 𝐎𝐩𝐞𝐧𝐀𝐈 / 𝐂𝐡𝐚𝐭𝐆𝐏𝐓 𝐀𝐏𝐈𝐬 𝐭𝐨 𝐛𝐮𝐢𝐥𝐝 𝐀𝐈-𝐩𝐨𝐰𝐞𝐫𝐞𝐝 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬, 𝐚𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧 𝐰𝐨𝐫𝐤𝐟𝐥𝐨𝐰𝐬, 𝐚𝐧𝐝 𝐢𝐧𝐭𝐞𝐥𝐥𝐢𝐠𝐞𝐧𝐭 𝐟𝐞𝐚𝐭𝐮𝐫𝐞𝐬 𝐢𝐧𝐭𝐨 𝐦𝐨𝐝𝐞𝐫𝐧 𝐬𝐲𝐬𝐭𝐞𝐦𝐬. 𝐖𝐡𝐚𝐭 𝐬𝐞𝐭𝐬 𝐦𝐞 𝐚𝐩𝐚𝐫𝐭: ✔ Enterprise-grade backend architecture ✔ Scalable cloud solutions (Azure & AWS) ✔ Secure API development & system integration ✔ Clean, maintainable, production-ready code ✔ Strong communication & structured delivery I don’t just develop APIs - I architect scalable platforms that drive real business growth. Let’s connect to discuss your requirements and design a robust backend solution tailored to your needs.