Hire the Best API Developers in Hanoi, VN

🏆 Upwork Top Rated Plus Talent from July 2023 until now 🏆 Upwork Top Rated Talent from Feb 2022 to July 2023 ⚡ Earn $100K+ after 4 years working on Upwork I am acknowledged as a top Zoho developer in Vietnam, and potentially all of Southeast Asia, with specialized expertise in C#. Zoho Ecosystem & Business Automation - Zoho One Architecture: End-to-end implementation and optimization of CRM, Books, Inventory, and Projects. - Advanced Development: Expert in Deluge, Client Scripts, and Custom Widgets to extend native functionality. - API & Integration: Engineering robust connections between Zoho and third-party services (Stripe, Xero, Twilio, RingCentral, and Shipping APIs). - Workflow Engineering: Designing complex automation and data validation logic to ensure system integrity and operational efficiency. AI & Intelligence Integration - LLM Implementation: Integrating ChatGPT and Gemini APIs into business workflows for automated document extraction (OCR) and intelligent client response generation. - Structured Data Processing: Transforming unstructured PDF/email content into actionable JSON data. Full-Stack Development (C# / .NET) - Enterprise Applications: Developing scalable solutions using ASP.NET Core and .NET 5+, following SOLID principles and Design Patterns (MVC, DI, Repository). - Data Architecture: High proficiency in Entity Framework Core, SQL database design, and performance optimization. - Modern Frontend: Building clean, high-contrast user interfaces with React and Ant Design (antd). - DevOps & Cloud: Managed version control via Git and deployment experience on Azure/AWS environments.

🚀 Full Stack Developer | React, Next.js, Node.js, FastAPI | Scalable Web Applications Hey there! 👋 I'm Thuan, my English name is Nathan, a Results-driven Full-Stack Engineer with over 4 years of experience designing, building, and shipping scalable web and mobile-hybrid applications. As a Full Stack Engineer, I specialize in high-performance frontend solutions with React and Next.js, combined with robust backend architectures using Node.js and FastAPI. I handle everything from REST API design and database management to AWS cloud infrastructure, ensuring you get a seamless, production-ready product from a single expert. 🏆 5.00 ★★★★★ Client Feedback 🏆 100% Job Success Score ✅ 4+ Years of Full Stack Developer Experience ✅ Modern, Maintainable & Scalable Code 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤: ➡️ 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 → React.js, Next.js, TypeScript, JavaScript, Tailwind CSS, Redux, Zustand, React Query ➡️ 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 → Node.js, Express.js, FastAPI, Python, REST APIs, GraphQL ➡️ 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 → PostgreSQL, MongoDB, Supabase, Prisma ➡️ 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬 → AWS, Docker, CI/CD, Vercel ➡️ 𝐓𝐨𝐨𝐥𝐬 & 𝐕𝐞𝐫𝐬𝐢𝐨𝐧 𝐂𝐨𝐧𝐭𝐫𝐨𝐥 → Git, GitHub, VS Code, Figma, Claude Code, GitHub Copilot Unlike many developers who rush through projects just to get them done, I’m committed to delivering work that truly performs. I’ll invest extra hours researching and refining to ensure your website or app not only functions smoothly but also drives real engagement and value. And there’s no extra charge for this commitment—just my promise to exceed your expectations. I’ve found that the biggest problem in web development is that 90% of users will leave a website if it is unresponsive. People tend to abandon a page after just 5 seconds of it not responding. Therefore, I will create a seamless experience for users by ensuring that all interactions are responsive, such as adding animations when a user hovers over a button or indicating when something is loading. If we were to work together, all I need from you is some basic information about your goals, target audience, and any existing projects. Just answer a few questions I might have, and I’ll take care of the rest. 📩 Send me a message or invite me to your project. Let's talk. 🚀 Keywords: Full Stack Developer | Full Stack Engineer | Frontend Engineer | Backend Engineer | React Developer | Next.js Developer | Node.js Developer | TypeScript Developer | JavaScript Expert | Web Application Development | SaaS Application Development | Admin Dashboard Specialist | React | Next.js | TypeScript | Node.js | FastAPI | Python | REST API | PostgreSQL | MongoDB | AWS | Docker | CI/CD | React Native | Mobile App Developer | Hybrid Mobile Apps | Tailwind CSS | Redux | React Query | Zustand | Supabase | GraphQL | E-Learning Platform | IoT | Energy Management Systems | Agile | Scrum | UI/UX Implementation | Figma to Code | Clean Architecture | Performance Optimization | Rapid Prototyping | AI Integration | Claude Code | GitHub Copilot | Frontend Lead | Full Stack React Node | MERN Stack | Full Stack Development | Web Developer | API Developer | Microservices | Multi-Tenant SaaS | DevOps | Software Engineer | Senior Frontend Developer | Full Stack JavaScript Developer | Responsive Web Design

I’m a developer experienced in building websites for small and medium-sized businesses. Whether you’re trying to win work, list your services, or create a new online store, I can help. Knows HTML and CSS3, PHP, jQuery, SEO and more skills completely build website system. Full project management from start to finish Regular communication is important to me, so let’s keep in touch.

- 9+ years in building scalable .NET applications 🔥🔥🔥🔥🔥WHY SHOULD YOU HIRE ME ?🔥🔥🔥🔥🔥 ✅ Communication ✅ High availability ✅ Fast and professional work ✅ Solid, maintainable ✅ Manage and ensure product delivery time ⭐️⭐️⭐️⭐️⭐️ SKILLSET⭐️⭐️⭐️⭐️⭐️ ✅Back-End - .NET, .Net Framework, .NET Core, .NET 7, ASP MVC, RabbitMQ, Kafka, EF Core, MS SQL Server - .NET Core, ASP.NET Core, Blazor, Razor Page. - Entity Framework Core (code first & database first), Dapper - Asynchronous and multithreading - C# , async-await ✅ Front-End: Angular, Vue Js, React, HTML, CSS, JQuery, Plain JS, TypeScript, Blazor, Razor, ABP ✅ Databases: SQL Server, Postgresql, MySQL, MongoDB, Firestore, Redis, Firebase ✅ Testing: XUnit, NUnit ✅ Authentication & Authorization: JWT, OAuth2, OpenID Connect ✅ External login (Google, Loyalty) ✅ Logging: Serilog, Datadog, Sentry, Log4net ✅ Search Engine: Solr, Elastic ✅ Cloud: Azure, GCP, AWS ✅ Others: Docker, Kubernetes, Gitlab, Git Flow, Design Pattern, Multi tenants, RabbitMQ, Kafka, iTextsharp, Chat GPT ⭐️⭐️⭐️⭐️⭐️ WHAT I OFFER AND SATISFY YOU ⭐️⭐️⭐️⭐️⭐️ ✅ REST API design, implementation, and integration ✅ Database architect, optimization, and profiling ✅ API Integration ✅ Caching ✅ Cron / Background / Windows service ✅ Web Service ✅ Payment Integration (Adyen, 2c2p, Napas)