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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.

Passionate full-stack engineer with 5+ years of hands-on experience in developing scalable websites/applications using a wide range of front-end and back-end skills like HTML,CSS,Javascript/Typescript,React,Django/FastAPI, etc. Developed 10+ websites from scratch as a freelancer/contractor. My main passion is to help small and medium sized enterprises and individual entrepreneurs develop software solutions in line with the industry's best practices. Expertise: - Backend: Node.js, Python - Frontend: HTML/HTML5, CSS/CSS3, Javascript/Typescript/jQuery/Datatable, React - Cloud: AWS, Google Console, Azure, Digital Ocean - Database: MySQL, MSSQL, PostgreSQL, MongoDB, etc If you are looking for someone not only experienced but also can do anything to make your business successful, you probably are looking for me. Thank you. Tien Ly Thanh

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, 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

Hi, I'm Tinh Nguyen, a React Native Developer from Vietnam with 4+ years of experience building and maintaining high-quality cross-platform mobile applications for iOS and Android. I have worked on a wide range of production applications across Social Commerce, FinTech, Logistics, E-commerce, Education, Travel, and Enterprise domains. My focus is not only on delivering features but also on building scalable, maintainable, and high-performance mobile applications. What I can help you with: 🚀 Build React Native applications from scratch or modernize existing projects 🏗️ Design scalable mobile architectures using Clean Architecture and Modular Architecture 📱 Develop production-ready applications for both iOS and Android 🔄 Upgrade React Native versions and migrate legacy native applications ⚡ Optimize performance, startup time, memory usage, and user experience 🔒 Implement secure authentication and mobile security best practices 🚀 Configure CI/CD pipelines and manage App Store & Google Play releases Technical Expertise: React Native, TypeScript, JavaScript Redux Toolkit, Redux Saga, React Query (TanStack Query) React Navigation Firebase (Authentication, Firestore, Cloud Messaging, Analytics, Crashlytics, Remote Config) GraphQL & REST APIs WebSocket & Real-time Communication Push Notifications Deep Linking AppsFlyer Feature Flags OTA Updates (CodePush-style deployment) QR Authentication Native Modules (iOS & Android) Stripe, RevenueCat, Payment Integration Google Maps, Camera, Location Services Node.js, NestJS Claude Code, Cursor, ChatGPT, Gemini MongoDB, PostgreSQL, Firebase Git, Azure DevOps, Jira, Postman Production Experience Throughout my career, I've delivered applications featuring: Livestream commerce AI Chatbot integration Live Chat & Messaging Offline-first architecture Payment & Subscription systems QR Login & Authentication eKYC integration Push Notifications Analytics & User Tracking Feature Rollout & OTA Updates Mobile Security (SSL Pinning, OTP verification, Cloudflare protection) CI/CD automation and release management How I work: I believe successful projects come from clear communication, clean code, and long-term maintainability. I work closely with designers, backend engineers, QA teams, and product managers to deliver reliable mobile applications that are easy to scale and maintain. I'm comfortable working independently or as part of a distributed team using Agile methodologies, participating in code reviews, technical discussions, sprint planning, and continuous delivery processes. I'm based in Vietnam (UTC+7) and have experience collaborating with clients across Asia, Australia, Europe, and North America. I provide regular progress updates and maintain transparent communication throughout the development process. If you're looking for a React Native developer who can take ownership of features, deliver production-quality code, and contribute to the long-term success of your mobile product, I'd be happy to discuss your project.

My name is Luan. It is nice to meet you. I have 5+ years experience in full stack web developer with javascript expertise. My experience: * Front-end: React / Redux / NextJS / Typescript * Mobile and Desktop: React-Native / ElectronJS (MacOS applications) * Back-end: Node / Golang / ExpressJS / NestJS / Socket.io * Database: MongoDB / PostgresQL / MySQL * Blockchain: Solidity / Smart Contracts (Junior level) * Devops: AWS / DigitalOcean / Shell-Script /Docker and CI/CD auto deployment * Unit tests: Jest / Mocha and Chai Thank you for visit my profile. I will try my best to working with you! Have a nice day! Luan

I transform ideas into high-performance web applications across diverse domains including gaming, fintech, healthcare, and e-commerce. With 3+ years of fullstack expertise and leadership experience, I deliver: 🚀 AI & SAAS SPECIALIST - Super fast delivery of AI-powered SaaS applications from concept to production - Integration of LLMs, computer vision, and predictive analytics into web applications - Custom AI recommendation systems and data processing pipelines - Rapid prototyping and iteration for AI-driven features ✨ FRONTEND EXCELLENCE - Responsive, user-focused interfaces with React, Next.js & TypeScript - Component libraries: MUI, Tailwind CSS, Bootstrap, shadcn/ui, Radix UI - Performance optimization with code splitting, lazy loading & React hooks - Interactive data visualizations & real-time updates 💪 BACKEND ARCHITECTURE - Scalable microservices using NestJS, Node.js & Domain-Driven Design - Game server infrastructure with Colyseus & WebSocket optimization - Multi-database solutions (MongoDB, PostgreSQL, Redis) - Advanced caching strategies & performance monitoring ☁️ AWS CLOUD MASTERY - Serverless architecture with Lambda & API Gateway - Container orchestration with ECS - Database optimization (DynamoDB, ElastiCache, DAX) - Monitoring & logging (CloudWatch, Sentry) - CI/CD pipeline implementation 🎯 WHY WORK WITH ME? - Owner of multiple microservices in production environments - Proven track record optimizing systems serving 500k+ users - Experience mentoring developers & leading technical initiatives - Clear communication & on-time delivery Let's discuss how I can help bring your project to life!