Hire the Best Nest.js Freelancers
in Vietnam

Help startups and indie hackers build secure, reliable, and scalable software, allowing founders to focus on business growth without worrying about technical limitations or system failures. Some of my past projects: - Invygo: a car subscription platform operating in the UAE and Saudi Arabia, serving over 20,000 long-term paying subscribers (from 1 yr), more than 100,000 total subscribers, and managing over 5,000 vehicles. - Ayyeka: a global IoT platform for critical data management, processing more than 3 million data points per hour across the US, Europe, MENA, and Asia. How can I help: - Design or improve scalable and reliable software architectures. - Do improvements for security and compliance requirements. - Build production-ready MVPs. - Build reliable and measurable AI solutions using LLMs, RAG, and agents. Also much experience for fixing hallucinations in AI systems. - Lead cross-functional teams and technical projects to achieve business goals. - Mentor junior engineers. I offer a free 15-minute consultation. Feel free to schedule a call to discuss your product or technical challenges. Keywords: - Backend: Node, Python, NestJS, Hono, Go, GraphQL, REST, tRPC, WebSocket, SSE, WebRTC, etc - Frontend: React, Next, Angular, Vue, TypeScript, Tailwind. - Mobile: React Native, Expo, iOS, Android, BLE. - Data: PostgreSQL, MongoDB, Redis, Supabase, Prisma, Drizzle. - Cloud: AWS, GCP, Cloudflare, Docker, Kubernetes, Terraform, CI/CD. - AI: Generative AI, Agentic AI, Automation, RAG, LangGraph / LangChain, Mastra, Vercel AI SDK, Composio, Embeddings, Vector DBs. - Payments: Stripe, PayPal, RevenueCat, Paddle, Polar, Checkout.

Hi, I’m Duc Le Van – a passionate Full-Stack Software Engineer with over 4 years of experience delivering real-world solutions in Logistics and SaaS. Currently at LOGI VIETFRANCE, I work closely with SOGET – a leading logistics tech firm based in France – building and maintaining scalable systems used across Europe and Africa. ———————————————————— Tech Stack: Backend: .NET (C#), NestJS, Node.js, Express Frontend: ReactJS, VueJS, Quasar, ChartJS, HTML/CSS... Database: SQL Server, PostgreSQL, MongoDB... DevOps: Azure DevOps, CI/CD, Docker ———————————————————— What I bring to the table: • Build and maintain end-to-end web applications • Develop scalable, secure APIs with .NET or NestJS • Craft beautiful, responsive UIs with Vue or React • Automate deployment with CI/CD and Docker • Refactor, debug, and optimize legacy systems ———————————————————— Why work with me? • Proven experience collaborating with distributed teams • Strong communication and a proactive mindset • Clean, testable, and well-documented code • Flexible to your time zone and workflow Available after 7:00 PM (GMT+7) on weekdays, with more flexible hours on weekends. ———————————————————— Let’s build something great together. I usually respond within a few hours – feel free to reach out anytime! Best regards, Duc Le Van

I’m a Fullstack Engineer with 7+ years of experience building SaaS platforms, backend systems, web applications, IoT platforms, and workflow automation solutions. My core stack includes Node.js, TypeScript, NestJS, ExpressJS, React, Angular, AWS Lambda, SQS, Step Functions, S3, PostgreSQL, MySQL, MongoDB, Redis, RabbitMQ, and REST API integrations. I can help you with: - Building fullstack web applications from frontend UI to backend APIs - Developing scalable Node.js/NestJS backend services - Creating React or Angular interfaces connected to real business workflows - Designing AWS serverless workflows and asynchronous processing systems - Integrating third-party APIs with retries, batching, and rate limiting - Applying AI tools and AI-assisted workflows to speed up development, refactoring, automation, and internal productivity tools - Building IoT backend systems and real-time data processing pipelines I have worked on enterprise SaaS products, manufacturing IoT systems, CMS platforms, workflow automation systems, and serverless backend services. I’m comfortable working with remote teams, clarifying requirements, reviewing code, and delivering clean, maintainable production code. If you need a fullstack developer who can understand the business flow, build reliable software, and use AI effectively to improve delivery speed and quality, I’d be happy to help.

Full-Stack Developer with 6+ years of experience building SaaS products, business applications, dashboards, CRM systems, and custom web platforms using React, Next.js, NestJS, TypeScript, PostgreSQL, PHP, and modern cloud platforms. I specialize in delivering scalable solutions from frontend to backend, with a focus on clean architecture, maintainable code, and excellent user experience. My experience includes: ✅ React.js / Next.js ✅ TypeScript / JavaScript ✅ NestJS / REST APIs ✅ Supabase / PostgreSQL ✅ PHP / CodeIgniter ✅ Tailwind CSS / Shadcn UI ✅ Stripe Integration ✅ GitHub / GitLab / CI/CD ✅ Vercel Deployment AI Development Experience: ✅ Claude Code ✅ OpenAI API ✅ Anthropic API ✅ AI-assisted development workflows I focus on writing clean, maintainable code and delivering reliable solutions that help businesses scale efficiently. As a Top Rated freelancer on Upwork, I strive to exceed client expectations by delivering quality results on time.

𝗜 𝗛𝗲𝗹𝗽 𝗙𝗼𝘂𝗻𝗱𝗲𝗿𝘀 𝗩𝗮𝗹𝗶𝗱𝗮𝘁𝗲 𝗕𝗲𝗳𝗼𝗿𝗲 𝗧𝗵𝗲𝘆 𝗕𝘂𝗶𝗹𝗱 — 𝗦𝗼 𝗧𝗵𝗲𝘆 𝗗𝗼𝗻’𝘁 𝗪𝗮𝘀𝘁𝗲 𝗧𝗶𝗺𝗲 𝗢𝗿 𝗠𝗼𝗻𝗲𝘆 𝗕𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗧𝗵𝗲 𝗪𝗿𝗼𝗻𝗴 𝗣𝗿𝗼𝗱𝘂𝗰𝘁 🚫⏳ 🚫💸 🚫 Not just prototypes. 🚫 Not just demos. ✅ Real products that can grow. Over the last 7+ years, I’ve been working as a full-stack engineer and backend architect building SaaS platforms, AI tools, and automation systems for startups and product teams. 🏆 I’m also a 𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 freelancer on Upwork trusted by companies across: • 🇺🇸 United States • 🇦🇺 Australia • 🇨🇦 Canada • 🇸🇬 Singapore • 🌏 Southeast Asia ━━━━━━━━━━━━━━━━━━ 🚀 𝗪𝗵𝗮𝘁 𝗜 𝗱𝗼 𝗯𝗲𝘀𝘁 I build AI-powered SaaS products and scalable platforms from idea to production. Typical journey I support: ⚡ Concept → MVP → Production → Scale Many founders reach out to me when they are building: ◆ 🤖 AI SaaS platforms ◆ 🧠 LLM-powered applications ◆ ⚙️ automation systems ◆ 🏪 SaaS marketplaces ◆ 📈 scalable startup platforms ◆ 🏢 enterprise web applications My focus is always the same: build stable systems that support real users. ━━━━━━━━━━━━━━━━━━ 🤖 𝗔𝗜 𝘀𝘆𝘀𝘁𝗲𝗺𝘀 𝗜 𝗯𝘂𝗶𝗹𝗱 ◆ 🧠 LLM applications powered by OpenAI ◆ 🔎 RAG pipelines for knowledge systems ◆ ⚡ AI automation workflows ◆ 🎯 AI recommendation & matching engines ◆ 📄 document AI and semantic search systems These are not experimental demos. They are designed for real production products. ━━━━━━━━━━━━━━━━━━ 🏗 𝗙𝘂𝗹𝗹-𝘀𝘁𝗮𝗰𝗸 𝗮𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 My development philosophy is backend-first engineering. I focus on systems that are: ⚡ scalable 🧱 maintainable 🚀 high-performance 🔐 secure ━━━━━━━━━━━━━━━━━━ ⚙️ 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝘀𝘁𝗮𝗰𝗸 ◆ ASP.NET Core (.NET 6+) ◆ Node.js ◆ NestJS Architecture: ◆ Clean Architecture ◆ SOLID principles ◆ Microservices systems ◆ CQRS & MediatR patterns Infrastructure: ◆ Hangfire — background processing ◆ SignalR — real-time systems Data layer: ◆ PostgreSQL ◆ SQL Server ◆ Redis caching ◆ FusionCache two-level caching Security: ◆ JWT authentication ◆ OAuth integrations ◆ Role-based authorization (RBAC) DevOps: ◆ CI/CD pipelines ◆ GitHub Actions ◆ Azure DevOps ━━━━━━━━━━━━━━━━━━ 🎨 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝘀𝘁𝗮𝗰𝗸 ⚛ React ⚡ Next.js 📘 TypeScript UI systems: ◆ TailwindCSS ◆ Material UI ◆ Ant Design Focus areas: 🚀 performance optimization 📊 SEO optimization ⚡ scalable frontend architecture ━━━━━━━━━━━━━━━━━━ 🎯 𝗪𝗵𝗲𝗿𝗲 𝗜 𝗮𝗱𝗱 𝘁𝗵𝗲 𝗺𝗼𝘀𝘁 𝘃𝗮𝗹𝘂𝗲 Many founders contact me when: ◆ their MVP is unstable ◆ their product is half-built ◆ their previous developer disappeared ◆ their system cannot scale ◆ their AI prototype needs real engineering Often the product started with tools like: ◆ v0 ◆ Lovable ◆ Replit ◆ no-code builders That’s completely fine. But when the system needs real architecture, performance, and stability, I step in to rebuild or scale it properly. ━━━━━━━━━━━━━━━━━━ 📊 𝗥𝗲𝘀𝘂𝗹𝘁𝘀 𝗜’𝘃𝗲 𝗱𝗲𝗹𝗶𝘃𝗲𝗿𝗲𝗱 📈 SaaS platforms used by 10,000+ users ⚡ reduced API latency by 70% using Redis caching 🤖 AI automation systems saving teams 20+ hours per week 🚀 delivered startup MVPs in 4–8 weeks ━━━━━━━━━━━━━━━━━━ 𝗛𝗼𝘄 𝗜 𝘄𝗼𝗿𝗸 Clients enjoy working with me because I think like a product engineer, not just a coder. My approach: 🗣 clear and direct communication 🧠 architecture-first thinking 💰 business-driven technical decisions 💡 proactive product suggestions 📈 long-term scalability mindset ━━━━━━━━━━━━━━━━━━ 𝗜 𝗱𝗼𝗻’𝘁 𝗷𝘂𝘀𝘁 𝘄𝗿𝗶𝘁𝗲 𝗰𝗼𝗱𝗲. I design systems that support real users, real traffic, and real business growth. ━━━━━━━━━━━━━━━━━━ If you're building an AI SaaS or startup product, feel free to reach out. Send me a message with: 💡 your idea 🧱 your current progress ⚠ the biggest technical challenge you’re facing I’ll tell you honestly whether I can help and how we can move forward.

Proficient in NodeJs, Java Spring Boot, React, Nextjs, Redux, etc. I'm a passionate Software Engineer with 5+ years of hands-on experience in both product-based and outsourcing projects. I specialize in backend development with Java (Spring Boot) and Node.js (Express, NestJS), and I'm also hands-on experience building and maintaining robust, scalable, and user-friendly web applications. My technical expertise covers product development, database design, and building scalable, maintainable systems. I have strong knowledge of design patterns (MVC, RESTful, Dependency Injection) and modern architecture, including microservices. 🔧 Technical Skills: - Languages: Java, JavaScript, TypeScript - Backend: Spring Boot, Node.js (Express, NestJs) - Frontend: React.js, Nextjs - Databases: PostgreSQL, MySQL, MongoDB, DynamoDB Let’s talk if you: ✔ Need a reliable developer who speaks fluent tech and clear business ✔ Want fast iterations and clean delivery ✔ Value transparency, accountability, and high-quality work I'm here to help you build reliable, efficient, and scalable software solutions. Let’s bring your ideas to life—feel free to reach out!