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Hello, Thank for visiting my profile. I'm a software engineer with 8 years of experience in developing Desktop Application. I have worked on many projects in this field and got success. I am good at C/C++, Win32, MFC, Qt, C# WPF, Winform, python, Java core and proficient in Visual Studio, Eclipse, Qt Creator. I deeply understand OOP design and GoF design patterns. I am familiar with both Window and Linux. I very happy to cooperate with you. Hai Nguyen.

25+ years of experience. Author of AccomNET accounting/sales software. Skills: .NET Framework: VB.Net/C#/VBA ASP.Net/ASP.Net Core/ Blazor Flutter Python React, Vue.js, Next.js Microsoft SQL Server

I’m a Senior .NET Developer combined with a Business Analyst mindset, with 10+ years of experience delivering and rescuing business-critical systems. I don’t just develop features — I analyze business workflows, fix system bottlenecks, and deliver scalable solutions that actually improve operations. In addition, I bring strong UI/UX implementation skills, allowing me to turn designs into pixel-perfect, production-ready interfaces — ensuring both performance and user experience. 🏆 Top Rated Freelancer 🏆 100% Job Success Score 💰 $10,000+ Earned 🚀 What I Specialize In 🔹 ERP / CRM / Business Systems Development Design and build systems for Sales, HRM, Warehouse, Manufacturing, Fleet Management Translate business requirements into scalable technical solutions 🔹 Legacy System Modernization (.NET) Upgrade old systems (.NET MVC, WebForms) → .NET Core / Blazor Refactor messy codebases into maintainable architectures Improve system performance, stability, and scalability 🔹 System Performance Optimization Fix slow systems (database queries, API latency, UI rendering) Optimize SQL, backend logic, and frontend performance 🔹 Pixel-Perfect UI Development (Figma / Adobe → Code) Convert Figma / Adobe XD / Photoshop designs into responsive HTML/CSS Ensure pixel-perfect accuracy across devices and browsers Implement UI using Blazor, DevExpress, Telerik 🔹 Business Analysis + Technical Execution Analyze workflows and suggest better system design Reduce operational inefficiencies through smart automation 💡 Why Clients Hire Me I think like a business owner, not just a developer I can quickly understand complex legacy systems and take ownership I proactively identify risks, bottlenecks, and better approaches I communicate clearly and provide regular progress updates 🧠 Tech Stack Backend: C#, .NET Core, ASP.NET MVC, Web API, Entity Framework Frontend: Blazor, HTML, CSS, JavaScript, Bootstrap, jQuery UI Frameworks: DevExpress, Telerik (Kendo UI), Syncfusion Database & Data: SQL Server, PL/SQL, OLAP, MDX Other: Python, ETL, Power BI, Excel, .NET MAUI 🎯 Productized Services (Fixed Scope – High Value) 💼 ERP / CRM System Audit – from $200 - Review architecture, database, and workflows - Identify bottlenecks & risks - Provide actionable improvement plan ⚡ Fix Slow .NET System – from $300 - Analyze performance issues (SQL / API / UI) - Optimize response time and system stability - Deliver measurable improvements 🔧 Legacy System Upgrade (.NET MVC → .NET Core / Blazor) - Codebase assessment - Migration strategy - Step-by-step modernization plan 📊 Database & Query Optimization – from $150 - Analyze slow queries - Optimize indexes and execution plans - Improve overall system performance 📌 Best Fit Clients - Companies running old .NET systems with performance issues - Businesses needing ERP / HRM systems built or improved - Founders who want a developer that understands business, not just code 💬 Let’s Work Together If your system is slow, hard to maintain, or no longer fits your business — I can help you analyze, fix, and upgrade it efficiently.

With over 10 years of full-stack development expertise, I specialize in: - C#/ WPF for developing Cross-platform application. Creating on demand installer with WIX, NSIS - Java 17 with Spring Boot for robust backend solutions. - Data JPA with PostgreSQL, MySQL for effective data management. - Angular/React + TypeScript for dynamic frontend development. - Deploying on ECS/EKS in AWS for scalable backend services. - AWS Amplify, Vercel, Firebase for streamlined frontend deployment. - AWS Gateway, VPC for ensuring service security. - Proficient in CI/CD pipelines for automated testing and deployment. I excel in delivering end-to-end software solutions, from requirement gathering to production deployment. My focus is on creating efficient, maintainable software with a solid foundation in Java and object-oriented design principles. Let's discuss how I can contribute to your projects.

Hi.I am Pham Van Sy. I 'm application developer. I have 6 years experience working on C++/C#,WPF,MVVM...Let's contact with me if you see i can do it

C++ Systems Developer | Security Software | Windows & Linux Internals I help companies build high-performance system software in C/C++ for Windows and Linux. My expertise is in low-level development where performance, reliability, and deep OS integration matter. I have experience developing security and system software, including file scanning engines, process protection/self-defense mechanisms, and cross-platform infrastructure. I work comfortably with OS APIs, filesystem internals, and debugging complex runtime issues. I also design automated testing environments using virtual machines to validate software across multiple OS versions and kernel configurations. What I can help with: - C / C++ system software development - Windows API & Linux system programming - Security software and endpoint protection components - Cross-platform libraries and infrastructure - Performance optimization and debugging - Logging, diagnostics, and runtime analysis - VM-based automated testing environments I focus on writing clean, efficient, and production-ready code that integrates deeply with the operating system.