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in Vietnam

✅ Top-Rated Senior Developer ✅ 100% Job Success Score ✅ Available for part-time, full-time long-term projects on Upwork (up to 40+ hours/week) ✅ Government ID Verified ✅ Professional Experience ✅ Expertise in .NET-based Web Applications, RESTful APIs, SPA architectures, CMS solutions, and enterprise-grade systems I’m a Senior Full-Stack .NET Developer with 6+ years of hands-on experience delivering and optimizing production-ready applications using C#, ASP NET / .NET Core, ABP Framework, and frontend technologies such as Angular, React, and modern JavaScript frameworks. I work across both backend and frontend, focusing on APIs, database design, performance optimization, and building responsive, user-friendly interfaces. What I Help You With - Custom web applications & system upgrades - Secure, efficient API integrations - Performance optimization & code refactoring - Long-term maintenance & scalability improvements Technical Expertise - Backend: C#, ASPNET MVC/Core, Web API, EF/EF Core, ABPio - Frontend: Angular, React, Vue, Blazor WASM, Nextjs, Tailwind, Telerik/Kendo UI - Databases: SQL Server, Azure SQL, MySQL, PostgreSQL, MongoDB - Cloud & Tools: AWS, Azure, Git, Visual Studio, CI/CD - Platforms: Windows Server, Linux, macOS Why Choose Me ✔ Clean, scalable, and maintainable code ✔ Fast delivery without sacrificing quality ✔ Client-focused communication ✔ High-performance, real-world applications ✔ Money-back guarantee & long-term discounts Availability 🕒 Part-time or Full-time (40+ hrs/week) | Ready to start immediately 💬 Response within 1 hour | Flexible time zones 👉 Click “Hire Now” or “Invite to Interview” to get started. Best regards, Le Xuan Thuan

First of all, I only work ONE project at a time, because I want to concentrate on that single project's quality, so you can be sure that your project is being fully taken care of. Moreover, you can communicate with me in most time of a day, most days of a week because I believe communication is the key to the success of a project. I have 6 years experience in software development fields, with 3 years in Java and 5 years in C# (sometimes I work in both). I am a Microsoft Certified Professional and Microsoft Specialized C# Programmer. Summary of works I have done: - Web Applications using ASP.NET MVC (C#), and I am especially good with databases with SQL Server (I also worked 1 project with MySQL) and Entity Framework. - Game Development (in LibGDX). - Windows Form and WPF Applications for Windows Dekstop. - Java Android Application, and some experience in JavaSE (Tomcat and JBoss server) Currently work as freelancer.

As a seasoned Full Stack .NET Developer with over 6 years of hands-on experience, I have successfully built and delivered 40+ fast, reliable, and scalable .NET web applications. I specialize in creating enterprise-grade software solutions using C#, ASP.NET MVC/Core, Web API, and Angular technologies. My backend expertise enables developing secure, high-performance .NET systems that efficiently manage millions of transactions and users. On the frontend, I craft interactive and responsive applications using Angular, ensuring seamless user experiences across platforms. 🔹Services Offered: - Custom Full-Stack Web Development - Custom Web Application Development - API Development & Integration - Desktop Applications - Responsive Web Design - FinTech and Payment Systems Development - Database Management & Optimization 🔹 Full-Stack & Web Development: - .NET Core, ASP.NET Core, ASP.NET MVC, ASP.NET Web API - C#, .NET, .NET Framework, .NET 6, 7 - Angular, JavaScript (ES6+), TypeScript, jQuery - Razor Views, Web Forms, WebForms, WinForms - Entity Framework, Entity Framework Core - Tailwind CSS, Bootstrap 5, Material UI, shadcn/ui - HTML5, CSS3, SCSS, Styled Components - PSD/Figma/Sketch to HTML 🔹 𝐀𝐏𝐈 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: - Google APIs (OAuth 2.0, Authentication, Maps, etc.) - Stripe, PayPal, AWS SDK, Azure, Strava, OpenAPIs - ElasticSearch, Redis, Dropbox, BluePay 🔹 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀 & 𝗤𝘂𝗲𝗿𝘆 𝗟𝗮𝗻𝗴𝘂𝗮𝗴𝗲𝘀: - MySQL, PostgreSQL, MongoDB, Microsoft SQL Server, DynamoDB, Firebase - GraphQL, SQL, MongoDB Query Language (MQL) 🔹 𝗧𝗼𝗼𝗹𝘀 & 𝗢𝘁𝗵𝗲𝗿 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀: - RESTful APIs, WebSockets, WebRTC, Git, GitHub, GitLab, Bitbucket - Blazor, SignalR, JWT, Passport.js, Firebase Auth, SCRUM - AWS (EC2, S3, SNS, SES, Lambda, ElasticSearch, Redis) 🔹 Whether you are looking for a robust .NET web application, advanced API development, or secure database optimization, I bring reliability, speed, and scale to every solution. Let’s transform your ideas into impactful digital experiences.

I have experience working in various tech roles, including technical advisor, team lead, senior software engineer, and full-stack developer. Responsibilities include consulting with clients to select the right technical solutions, recommending improvements, and coordinating with team members to ensure that projects are delivered on time and meet high standards. I also handle VPS management, deployments, and platform migrations using the latest technologies. Below are the tech stacks I’ve worked with: ☑ Ruby on Rails; PHP Laravel; Node.js, ExpressJS, NextJS; Kafka, GraphQL; HTML, HAML, JavaScript, TypeScript, JSON, XML, YAML; Testing: Rspec, Capybara, PHPUnit ☑ Databases: MySQL, PostgreSQL, MongoDB ☑ Server: nginx, Ubuntu, Cloudflare, and other CNDs; VPS: DigitalOcean, OVHcloud, Vultr ☑ SEO: JSON-LD, Google Pagespeed; Frontend: Vue.js, ReactjS, jQuery; Design: Bootstrap, Tailwind CSS, Foundation, Materialize ☑ DevOps: Docker, Kubernetes, Minikube, Helm, AWS, GCP; Version Control: Git, GitHub, GitLab, Bitbucket, Git Flow ☑ Domain & Email: Namecheap, GoDaddy, Custom email with Zoho, Email Hosting Services, Mailchimp, Mailgun I've worked with various projects, companies, languages, frameworks, CMS, and technologies, helping me quickly adapt and apply best practices. This broad knowledge allows me to efficiently handle performance and security issues and offer tailored solutions, diving deeper into problems as needed. Are you looking for a developer to: ◎ Build a website from scratch with high code quality ◎ Enhance security/performance/fix bugs/ implement new features independently or collaborate with your English-speaking team ◎ Improve Google Page Speed score I'm a Senior Software Engineer with 15 years of experience developing secure, scalable web applications. I can help resolve these issues. While I may not claim supremacy in this field, I offer a unique combination of commitments: ☑ I dedicate my time to the in-depth understanding of your challenges. ☑ Swift problem-solving: I quickly tackle complex technical issues that may challenge others. ☑ Security mastery: Years of experience inform my comprehensive security audits and implementations. ☑ Risk insight: I help you navigate and mitigate technical project risks, drawing on extensive experience. ☑ Performance enhancement: I specialize in advanced optimization for applications and databases. This approach sets me apart in delivering value and results. I've found some major problems in web applications: ◼ Slow loading times and poor performance ◼ Scalability issues during traffic spikes ◼ Security vulnerabilities and data breaches ◼ Poor database query optimization ◼ Difficulty maintaining and updating monolithic architectures ◼ Difficulty implementing complex business logic ◼ Poor test coverage and quality assurance processes My experience allows me to deliver results beyond basic requirements, anticipating needs and providing enhanced value.

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