I've worked in every domain of software. Tell me what you're up to and I'll lead us through an effective solution. - Backend specialist for 5 years at S&P and Banqsoft. - Mobile specialist for 7 years with Diversido, Noble Muffins and other clients. - Professional experience with React, TypeScript, C++ and Java. I got my start when I took over IT at a horse trailer dealership to gather money to move to Europe. At S&P, I took our team's first two microservices from zero to production. I later served as scrum master, and was given a technical excellence award for my work in SQL optimization. As a game developer, my Turbo Slicer product has been featured repeatedly by the Unity Asset Store. I wrote a finite element analysis kit for PlayWay S.A. to manage building collapse for the games Construction Machines 2016, Demolish & Build 2017 and Demolish & Build 2018. In my spare time I support new programmers on Codementor.io.

I am a 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 .𝐍𝐄𝐓 & 𝐀𝐒𝐏.𝐍𝐄𝐓 𝐂𝐨𝐫𝐞 & 𝐀𝐧𝐠𝐮𝐥𝐚𝐫 Developer with 8+ years of experience building enterprise-grade web applications, REST APIs, and workflow automation systems using Microsoft technologies. I specialize in end-to-end solutions using 𝐀𝐒𝐏.𝐍𝐄𝐓 𝐂𝐨𝐫𝐞, 𝐂# 𝐚𝐧𝐝 𝐀𝐧𝐠𝐮𝐥𝐚𝐫— delivering robust backends paired with dynamic, responsive frontends. I also extend these with 𝐌𝐢𝐜𝐫𝐨𝐬𝐨𝐟𝐭 𝐏𝐨𝐰𝐞𝐫 𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦 (𝐏𝐨𝐰𝐞𝐫 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐞, 𝐏𝐨𝐰𝐞𝐫 𝐀𝐩𝐩𝐬, 𝐏𝐨𝐰𝐞𝐫 𝐁𝐈) to automate business processes and create complete digital transformation for organizations of all sizes. 𝗪𝗵𝗲𝗿𝗲 𝗜 𝗰𝗿𝗲𝗮𝘁𝗲 𝘁𝗵𝗲 𝗺𝗼𝘀𝘁 𝘃𝗮𝗹𝘂𝗲: 🏥 𝗛𝗲𝗮𝗹𝘁𝗵𝗰𝗮𝗿𝗲 & 𝗟𝗶𝗳𝗲 𝗦𝗰𝗶𝗲𝗻𝗰𝗲 — Clinical trial & sample-tracking apps, patient/provider portals, staffing platforms, FHIR API integration, and HIPAA-conscious architecture. (Certified in Healthcare Interoperability & FHIR + HIPAA Compliance.) ⚙️ 𝗙𝘂𝗹𝗹-𝗦𝘁𝗮𝗰𝗸 .𝗡𝗘𝗧 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 — ASP.NET Core, C#, Web API / REST, Blazor, Entity Framework Core, Clean & Microservices architecture, paired with Angular (RxJS, NgRx, Material) front-ends. 🔄 𝗣𝗼𝘄𝗲𝗿 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺 & 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 — Power Apps (Canvas & Model-Driven), Power Automate approval/notification workflows, Power BI dashboards, SharePoint, and Dataverse — to eliminate manual work and connect your Microsoft 365 stack. ☁️ 𝗖𝗹𝗼𝘂𝗱 & 𝗗𝗲𝗹𝗶𝘃𝗲𝗿𝘆 — Azure Functions, Logic Apps, Azure DevOps CI/CD, and AWS — deployed cleanly and built to scale. 𝗔 𝗳𝗲𝘄 𝗼𝘂𝘁𝗰𝗼𝗺𝗲𝘀: • Built and scaled a HealthTech platform over a 2,300+ hour engagement ($25K+ contract) with a 5-star result. • Delivered a Power Apps portal for clinical research & biospecimen tracking. • Led full-stack delivery on multi-month enterprise builds with 1,000+ hour, 100%-satisfaction contracts. 𝗪𝗵𝘆 𝗰𝗹𝗶𝗲𝗻𝘁𝘀 𝗸𝗲𝗲𝗽 𝘄𝗼𝗿𝗸𝗶𝗻𝗴 𝘄𝗶𝘁𝗵 𝗺𝗲: ✔ End-to-end ownership — Angular front-end, ASP.NET Core back-end, Azure deployment, all from one person. ✔ Clean, maintainable code with proper architecture — not just "it works today." ✔ Deep Microsoft-ecosystem expertise across .NET and Power Platform (most developers do one, not both). ✔ Clear communication, honest timelines, and reliable long-term support. If you need a developer who understands both the code and the compliance — someone who can build the app and automate the process around it — let's talk. Send me a message with a bit about your project and I'll tell you honestly how I'd approach it. 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀: C#, ASP.NET Core, ASP.NET MVC, .NET, .NET Core, .NET 8, Blazor, VB.NET, Web API, REST API, Entity Framework Core, Dapper, LINQ, SignalR, gRPC, TypeScript, JavaScript, jQuery 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀: Angular, RxJS, NgRx, Angular Material, Bootstrap, Tailwind CSS, .NET MAUI, Xamarin, Razor Pages 𝗖𝗹𝗼𝘂𝗱: Microsoft Azure, Azure Functions, Azure Logic Apps, Azure DevOps, Azure App Service, Azure SQL, Azure Storage, CI/CD Pipelines, AWS, EC2, S3, RDS 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀: SQL Server, T-SQL, MySQL, PostgreSQL, MongoDB, Dataverse, Cosmos DB, Database Design, Query Optimization 𝗣𝗼𝘄𝗲𝗿 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺: Power Apps, Canvas Apps, Model-Driven Apps, Power Automate, Power BI, Power Fx, SharePoint, SharePoint Online, Microsoft 365, Copilot Studio, Dynamics 365 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲: Clean Architecture, Microservices, Domain-Driven Design, MVC, MVVM, SOLID, Design Patterns, System Design, Scalable Architecture, API Design 𝗔𝗜: Azure OpenAI, Microsoft 365 Copilot, AI Integration, LLM Integration, RAG, AI-Assisted Development, GitHub Copilot 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀: Healthcare Software, HealthTech, Life Sciences, Clinical Trials, EHR/EMR, FHIR, HIPAA Compliance, HL7, Telehealth, Fintech, B2B Portals, EdTech, E-Learning, Enterprise Software 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀/𝗦𝗸𝗶𝗹𝗹𝘀: Digital Transformation, Workflow Automation, Business Process Automation, Requirements Gathering, Agile/Scrum, Full-Stack Development, Web Application Development, Legacy Modernization, Third-Party API Integration, Payment Integration (Stripe/PayPal), Twilio, Technical Consulting, Solution Architecture

I'm a Top Rated Senior C#/.NET Developer with 13+ years of experience building enterprise applications, APIs, system integrations, and data processing solutions. I've earned $80K+ on Upwork with a 100% Job Success Score by helping businesses modernize software, automate workflows, and solve complex technical challenges. I specialize in developing reliable backend systems using C#, ASP.NET Core, .NET, SQL Server, Entity Framework, REST APIs, Azure, and enterprise integrations. My experience includes building new applications, enhancing existing systems, integrating third-party platforms, and modernizing legacy applications such as MS Access and COM-based solutions. Over the years, I've delivered solutions for healthcare, legal, eDiscovery, document processing, OCR, JSON/XML transformations, data migration, reporting, and enterprise automation. I enjoy working on projects that require strong problem-solving skills and attention to detail. My core expertise includes: • C#, .NET, ASP.NET Core • SQL Server, Entity Framework • REST APIs & Third-Party Integrations • Azure & Cloud-Based Solutions • AI Automation & OpenAI Integration • JSON, XML & Data Transformation • OCR & Document Processing • Enterprise Software Development • Legacy System Modernization (MS Access, VBA, COM) • Performance Optimization & Debugging Clients value me for writing clean, maintainable code, communicating clearly, and delivering dependable solutions. Many of my projects have turned into long-term collaborations because I focus on understanding business requirements and building software that is scalable, reliable, and easy to maintain. If you're looking for an experienced developer who can build, integrate, modernize, or automate your business applications, I'd be happy to discuss your project.

⭐5 years as C++/C# developer in supply chain industry ⭐2 years as Unreal Engine 5 developer in porting co-development company ⭐Godot and GDevelop on Upwork ✨Hobbiest indie game developer. On my way to first commercial release Supply chain industry experience taught me how to write laconic, effective and supportable code. I use OOP, SOLID, IOC for guidance, and know my way around design patterns. I was designing and developing REST API to ensure backend communication with in-house developed frontend. Before that I assisted with support of huge monolithic application. When working as an Unreal Engine developer I was dealing with platform-specific APIs, wrote tools for designers, and adapted old UE3 systems to work in new UE5 project. It will be a pleasure for me to help with your project. Write me and we will create something fabulous!

I have a deep knowledge and huge experience in game development and programming with various components like gameplay/audio/physics/graphics, I'm working very fast and always meeting all deadlines, providing high quality code, always looking for challenges and difficult tasks...

High-performance backends. Decision engines. AI factories. Computer vision. Real-time systems. From UI/UX-heavy MVPs to full-stack platforms built for the traffic that comes after launch day, not just during it. Rust, C++, and 5+ languages. 100,000+ concurrent WebSocket connections -- in production. A 12-week roadmap shipped in 4. 30 senior engineers. Dedicated project teams, not rotating freelancers. Every engagement starts with a paid Discovery phase -- we scope the architecture before we write a line of code. Not a fit: no-code workflows, or projects solvable with Zapier. WHAT I BUILD - High-Performance Backends: Production backends with actix-web, axum, and Tokio -- millions of requests/day, zero GC pauses. REST, GraphQL, WebSocket, and gRPC services for throughput and latency-sensitive workloads. - Full-Stack Platforms: React, Next.js, TypeScript frontends with production backends -- SaaS, MVPs, and custom web applications from architecture to deployment. Designed for 1K to 100K concurrent users without a rewrite. - Autonomous AI Agents: Agentic pipelines with OpenAI and Anthropic Claude -- lead qualification, data analysis, customer support running 24/7. Multi-step reasoning, error recovery, state persistence. 11+ projects for one client. - Computer Vision: Object detection, tracking, real-time inference, OCR, document processing -- CUDA-optimized, deployed as production APIs or edge devices. Not Jupyter notebooks. - Real-Time 3D & Visualization: WebGL and WebGPU rendering -- product configurators, data dashboards, architectural viewers at 60fps in-browser on mid-range hardware. - Data Pipelines: Rust-native processing with Polars and DataFusion -- replacing Python/JavaScript bottlenecks. Kafka streaming, PostgreSQL persistence. - Cloud & Infrastructure: AWS, GCP, Azure with Terraform and Kubernetes -- auto-scaling, zero-downtime deployments, infrastructure-as-code. RECENT OUTCOMES - Crypto trading platform dropping connections above 8,000 users. Rebuilt proxy in Rust, Tokio, Kubernetes -- 100,000 connections at under 10ms, zero crashes. - GovTech blockchain payment router on Go. Rebuilt IAVL Tree in Rust -- 20–30% faster, Clutch-reviewed (Alex Kampa, AZKR Research). - Recruitment team spending 4 hours daily on manual data entry. Built automated extraction and processing pipeline -- 95% reduction. - Data analytics platform hitting memory limits in JavaScript. Replaced core with Rust and Polars -- 5x faster processing, 70% lower memory. - Blockchain gaming 3D pipeline loading in 8+ seconds. Rebuilt within 4GB RAM budget -- 45% faster, Clutch-reviewed (Ruslan Varets). TECHNOLOGIES - Systems & Backend: Rust, C++, Python, TypeScript, actix-web, axum, Tokio, Node.js, WebAssembly - Frontend: React, Next.js, TypeScript, Tauri, Dioxus - AI & Agents: OpenAI, Anthropic Claude, Hugging Face, LangChain, RelevanceAI - Graphics: WebGL, WebGPU, OpenGL, Vulkan, three.js, GLSL/WGSL shaders, bevy - Vision: OpenCV, CUDA, PyTorch, TensorFlow, Keras, Mediapipe - Data: Polars, DataFusion, PostgreSQL, Kafka, Snowflake, Apache Arrow - Cloud & DevOps: AWS, GCP, Azure, Terraform, Kubernetes, Docker, GitHub Actions - Networking: WebRTC, LibP2P, QUIC, WebSocket, gRPC Delivery: Discovery → Architecture Review → Platform Build → Performance Testing → Production Deploy → Runbook Handoff. Fixed scope per phase. This profile is for engineering teams building production platforms under real load. Send your project brief -- I'll reply within 48 hours to assess fit.

Highly experienced and skilled in linux system, linux kernel and linux system programming. I had served in NXP semiconductor for 7 years, and worked in linux field for more than 15 years. Linux Kernel - Subsystem: KVM Virtualization, Filesystem, Network, USB, Linux Video - Debugging: Performance, System Analysis, Software Debugging, OOPS Embedded Linux - Frameworks: OpenWRT, Yocto, Android - Device Driver: USB, XHCI, WIFI, LTE, Network, Camera Linux System Development - System: Ubuntu, Centos, Archlinux, Raspberry pi, Orange pi - Network: VPN, VXLAN, IPTABLE, Router, Wireguard - Virtualization: Qemu, Libvirt, Virtualbox, Docker, K8s Programming Skills - C/C++ - Bash/Makefile - Android - Python

🚀 Top Rated Full-Stack .NET & Angular Developer | ASP.NET Core | C# | Web API | Azure Hello! I’m Gullzaib, a Senior Full-Stack .NET & Angular Developer with 5+ years of experience delivering high-performance, scalable web applications for SaaS, fintech, e-commerce, and enterprise platforms. I specialize in modernizing legacy systems, building high-performance APIs, and providing long-term support for complex applications. I help teams accelerate development, reduce bugs, and scale their platforms with clean, maintainable, and future-proof code. 𝗪𝗵𝗮𝘁 𝗜 𝗗𝗼 𝗕𝗲𝘀𝘁 Full-Stack Web Development: ASP.NET Core, Angular (v12–18+), Blazor, MVC, Razor Pages Backend & API Engineering: RESTful APIs, gRPC, Microservices, Clean Architecture, Async Processing Database Optimization: SQL Server, PostgreSQL, MongoDB, Entity Framework Core, Query & Stored Procedure Tuning Legacy System Migration: Modernizing ASP.NET / .NET Framework apps to ASP.NET Core with modern frontends Cloud & DevOps: Azure App Services, Functions, API Management, CI/CD Pipelines, Docker, Kubernetes Integrations & Payments: Stripe, PayPal, Shipping APIs, Webhooks, SaaS / Marketplace Integrations 𝗪𝗵𝘆 𝗖𝗵𝗼𝗼𝘀𝗲 𝗠𝗲? ✔ Proven Expertise: Delivered 5+ full-stack .NET projects with measurable improvements ✔ High-Performance Solutions: Applications designed to scale and handle thousands of daily transactions ✔ Client-Centric Approach: Clear communication, timely delivery, and long-term support ✔ Clean & Maintainable Code: Future-proof architecture, well-documented and easy to enhance ✔ Modern Tech: Always up-to-date with latest .NET Core, Angular, and Azure best practices 𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀 Full-Stack .NET Developer, Backend .NET Developer, ASP.NET Core, C#, ASP.NET MVC, Web API, RESTful APIs, Microservices, Clean Architecture, Blazor Server, Blazor WebAssembly, Razor Pages, Angular, RxJS, NgRx, React, Responsive Web Design, HTML5, CSS3, JavaScript, SQL Server, PostgreSQL, MongoDB, Entity Framework Core, Database Optimization, Legacy System Migration, Web Forms Migration, Performance Optimization, Azure, Azure DevOps, AWS, Docker, Kubernetes, CI/CD, Agile Development 𝐀𝐯𝐚𝐢𝐥𝐚𝐛𝐢𝐥𝐢𝐭𝐲 Part-time or full-time contracts Reliable US/EU timezone overlap Fast responses to messages are usually less than 1 hour 💬 Ready to accelerate your roadmap? Send me your project brief, and I’ll reply within 24 hours with a clear plan, recommendations, and actionable next steps.

Over the last 8+ years, I have developed a wide range of different applications using .NET Framework and .NET Core framework(ASP.NET Core 2+, ASP.NET MVC 3-5, WPF, WinForms, etc) and GHL and various UI development (React.js, Angular.js, JavaScript, JQuery, Bootstrap, CSS, Tailwind CSS, HTML, PHP, Laravel, etc). My goal is to participate in an interesting project and to establish a long-time collaboration with the customer. Experience and Skills: * 5+ years of experience as a QA Manual Tester. * 2+ years of experience in GHL, n8n Automation, AI integration, AI Agents • 7+ years of experience in analyzing, designing, developing, and maintaining web, Windows, N-Tier Object Oriented applications. • Experience in developing desktop applications using C#, WPF, Winforms, ADO.NET, Entity Framework. • Experience in ASP.NET, MVC, Ajax, jQuery, CSS, HTML, PHP, Laravel • Experience in working on Design Patterns & Practices like MVC, MVP, and MVVM. • Experience in developing n-tier C# applications. • Experience in developing Data Access Layers using various ORM and native libraries: Entity framework 6+, Entity framework core, bltoolkit, dapper, ADO.NEt • Experience in complex data collection and analysis for automating processes • Ability to take and give directions and instructions, and provide assistance through the completion of tasks. • Strong analytical and problem-solving skills.

🏆 TOP RATED PLUS ★★★★★ Recommended Freelancer on Upwork AI Senior .NET Developer with ✅ 15 years of experience, skilled in C#, .NET Framework, .NET Core, API Integration, and Microsoft Azure. Adept in Full Stack, Mobile, and Backend Development for comprehensive software solutions. ✔ Back-End Development: Expert in creating, supporting, and updating .NET projects; API creation and optimization; integrating AI solutions into .NET projects; and transitioning projects to Microsoft Azure cloud. ✔ Mobile App Development: Proficient in developing cross-platform mobile apps using MAUI and Xamarin. ✔ Full Stack Development: Skilled in building robust websites with ASP.NET MVC, ASP.NET Web API, Next.js, Angular, and React for a full-stack approach. ✔ Desktop Software Development: Experienced in Windows Desktop application development and support using WinForms, WPF, and Unity. ✔ Code Conversion: Skilled in converting code from C, Java, and Python to C#, optimizing for efficiency and maintainability. As a senior developer, I bring deep expertise across diverse .NET applications, including CFO-level insights for technical strategy, ensuring alignment with business goals.