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🧠 Senior Fullstack Team Lead | Mobile, IoT & AI App Developer | 6+ YOE | Flutter | Kotlin | Python | C++ I'm a Fullstack Team Lead and Mobile Developer with over 6 years of professional experience, building and launching cross-platform apps in mobile, desktop, and IoT ecosystems. I specialize in Flutter, Kotlin/Jetpack Compose, Ktor backend, and real-time technologies like Bluetooth, HID, WebRTC, and SocketIO. I’ve led full product lifecycles—from architecture to deployment—on apps that integrate hardware control, real-time communication, and AI-enhanced features, while delivering seamless user experiences across Android, iOS, and embedded systems. 🔧 Skills & Tech Stack Frontend & App Development: Flutter, Android (Jetpack Compose + XML), Kotlin, Java, SwiftUI Backend Development: Ktor (Kotlin), NodeJS, Python, Spring Boot, RESTful APIs Real-time & Embedded: Bluetooth LE, Serial Port, HID, WebRTC, FFmpeg, C++, Oboe Database & Cloud: Firebase (RTDB, Firestore, Auth), PostgreSQL, MySQL, SQLite, ObjectBox AI Integration: Tensorflow Lite, PyTorch, GPT API (Chatbot, Voice Transcription) CI/CD & Publishing: In-App Purchases, Mobile Ads (AdMob, AppLovin), Play Store, App Store 🚀 Highlight Projects 🎵 Smart Karaoke System (2024 - Present) Fullstack architecture for IoT-based karaoke system (5-member team) Tech: Flutter, Ktor, C++, FFmpeg, Serial Port, SocketIO, JavaFX, PostgreSQL Role: Architected system, managed backend & embedded communication, led team & QA 🖨 AirPrint – Mobile Wireless Printer App Print, scan, photo edit, Google Drive, and document conversions Tech: Flutter, Jetpack Compose, Firebase, Bluetooth, REST API Role: Solo Dev | Published on Play Store 🎮 XB Remote Play – PS4/PS5 Game Controller Stream console screen to mobile, cast multimedia, built-in game store and chatbot Tech: Flutter, WebRTC, C++, Firebase, SocketIO 🧠 Active9 – AI Health & Fitness Tracker Cross-platform health monitor app with AI voice & camera integration Tech: Flutter, NodeJS backend, Firebase, Google Ads Role: Fullstack Dev | Android / iOS 💡 IoT Controller Suite Devices: Smart LED Light, Canon/Brother Printer, Roku TV, LG ThinQ Tech: Flutter + Embedded C++ + BLE/HID + Python backend Role: Developed utility tools & device control protocols 🧭 Team Lead Experience Managed teams of 3–5 developers (Agile workflow, daily standups, code reviews) Mentored junior developers in mobile architecture and performance optimization Defined coding standards, release strategy, and quality assurance process Liaised between stakeholders, product owners, and QA during tight timelines 💬 Why Work With Me? I build feature-rich apps that bridge hardware and software I focus on clean architecture, maintainable code, and scalable design I value communication, timely delivery, and aligning with your business vision I constantly learn and integrate new tech to give your product an edge 🔗 Let's Build the Next Big Thing I bring a rare combination of deep technical skill, real-time system experience, and hands-on leadership. Whether you're launching a new product, rebuilding a legacy system, or integrating IoT devices, I can help turn your ideas into scalable, production-ready solutions. Let’s connect and bring your vision to life. Warm regards, Nguyễn Thiện Quang

- UTILIZING AI TECHNOLOGIES FOR THE DEVELOPMENT, TESTING, OPTIMIZATION, AND INTEGRATION OF PRE-EXISTING VOIP SYSTEMS WITH EXTERNAL SERVICES AND PLATFORMS. - I have more than 16 years to work as system administrator, deploy server, maintenance system base on: asterisk, voip, avaya, freeswitch, kamailio, opensip..... - Developed many VOIP solutions, system for customer over the world as: voicemail system, conference systems, IVR systems, calling card system. - Django developer: Develop e-commercial sites, CMS sites, API systems and more - AngularJS developer, one page applications. - etc.

🚀 I Build Scalable Software Systems That Don’t Break When You Grow Most developers write code. I design systems that survive scale. With 5+ years of experience as a Full-Stack & AI/ML Engineer, I architect and deliver high-performance systems used by global users, from AI-driven platforms to enterprise-grade distributed systems. 💡 What I Help You Achieve 🏗 Enterprise-Grade Architecture Scaling is not about adding servers later. It is about designing the right foundation from day one. I design: • Microservices and event-driven architectures • High-availability distributed systems • Horizontal auto-scaling infrastructure • Zero-downtime deployments • Load balancing and intelligent caching • Rate limiting and anti-DDoS strategies • Multi-tenant SaaS architecture Tech stack: • FastAPI, Django, Flask, Express.js, NestJS • Go, Java Spring, ASP.NET, Ruby • Docker, Kubernetes, AWS, Nginx, Linux • CI/CD pipelines, monitoring, logging systems • From MVP to enterprise-level traffic without rewriting the system later. 🧠 AI-Integrated Software Systems AI functions as an infrastructure layer inside modern applications. Experience includes: • NLP, OCR, facial and speech recognition • Intelligent search systems with vector databases • RAG pipelines and knowledge systems • Multi-model orchestration systems • GPU-optimized inference pipelines Frameworks and tools: • PyTorch, TensorFlow, Keras, scikit-learn • Whisper, Tesseract, PaddleOCR • DeepFace, InsightFace • Elasticsearch, Pinecone • CUDA, cuDNN Focus areas: performance, cost efficiency, production readiness, scalability. ⚡ Backend Engineering • RESTful APIs and GraphQL • Event-driven systems • Queue-based processing • Background job orchestration • Secure authentication and authorization Databases: • PostgreSQL, MySQL, MongoDB • Query optimization, indexing, full-text and vector search Databases and Optimization • PostgreSQL, MySQL, and MongoDB • Query optimization, indexing strategies, and search systems 🎯 Frontend Engineering • React, Next.js, Vue, Nuxt, Angular • SEO optimization • Performance tuning • Lazy loading and caching strategies • Responsive and scalable UI architecture 🌐 Real-Time Systems • WebRTC, MQTT, Socket • Streaming systems • Telecom systems Designed for low latency, high concurrency, and production reliability. 📱 Cross-Platform Development • Flutter • React Native • Native Android • Firebase ecosystem 🌟 Professional Approach • Systems thinking mindset • Scalability-focused architecture • Long-term maintainability • Clear communication • Reliable delivery 🌟 Why Clients Hire Me Not because I list technologies. But because I understand: • Business logic • Scalability constraints • Infrastructure costs • Security risks • Long-term maintainability I think like a technical founder or CTO. I don’t just build features. I design systems that support growth. 📈 Let’s Build It the Right Way If you need: • A SaaS platform built from scratch • A scalable enterprise backend • AI integrated into your product • A system redesign for performance • An architecture that can scale without limits Let’s build it properly from day one. Because great software isn’t just written. It’s engineered.

Hi, I'm Tinh, a Senior Full-Stack Developer with 9 years of experience building scalable web, mobile, and desktop applications. I specialize in developing modern software from concept to production, combining exceptional user experiences with robust backend architecture and AI-powered capabilities. My core stack includes React, Next.js, Node.js, TypeScript, Golang, PostgreSQL, MongoDB and cloud technologies, along with extensive experience integrating LLMs, Retrieval-Augmented Generation (RAG), and AI automation into production applications. What I specialize in 🤖 AI & LLM Development - OpenAI API, LangChain, LlamaIndex - Hugging Face Transformers - Prompt Engineering - Vector Databases (Pinecone, Weaviate, FAISS, pgvector) - Embeddings & semantic search - End-to-end RAG pipelines, including document ingestion, chunking, retrieval, and response generation 💻 Frontend - React, Next.js, Vue.js, TypeScript - Tailwind CSS, Material UI, Ant Design, Chakra UI, ShadCN UI - Redux Toolkit, Zustand, React Query - Vite, Webpack, Jest, Cypress - PWAs, SEO, responsive design ⚙️ Backend - Node.js, NestJS, Go - RESTful APIs & GraphQL - Authentication, authorization, background jobs, real-time systems - Microservices and scalable system architecture 🗄️ Databases - PostgreSQL, MySQL, MongoDB - Redis, Elasticsearch - DynamoDB, SQLite - Prisma, TypeORM 📱 Mobile - React Native - Flutter - Swift - Kotlin - Expo & Firebase 🖥️ Desktop - Electron - Tauri - .NET (WPF/WinForms) - JavaFX - PyQt ☁️ DevOps & Cloud - Docker - Kubernetes - AWS, GCP - Nginx - CI/CD pipelines - VPS deployment and infrastructure automation Why clients work with me - 9 years of professional full-stack development experience - End-to-end ownership—from planning and architecture to deployment and maintenance - Strong focus on clean, maintainable, and scalable code - Clear communication and proactive problem solving - Production-ready solutions with documentation and long-term maintainability Whether you're building a SaaS platform, AI application, internal business tool, mobile app, desktop application, or an enterprise RAG system, I can help take your idea from concept to production. Let's discuss how I can help bring your project to life. Thanks, Tinh

I help startups and businesses build high-quality mobile apps using Flutter and FlutterFlow — from MVP to production-ready product — with a dedicated team behind me to move fast and ship reliably. Beyond mobile, I bring a strong focus on AI-native development: using tools like Claude, Cursor, and AI agents not just as coding assistants, but to automate business workflows, clarify requirements faster, and reduce development time significantly. My strength is knowing where AI creates real productivity gains — and where traditional engineering is still the right call. With 20+ years in software development and experience serving clients across Japan, the US, Australia, and Asia Pacific, I understand how to work across different business cultures, communication styles, and project expectations. ✅ CORE EXPERTISE: ・Mobile: Flutter, FlutterFlow, React Native ・AI / LLM: OpenAI API, Claude, Dify, RAG, LangChain, n8n ・Backend: Ruby on Rails, Node.js, Python ・Cloud: Firebase, Supabase, AWS, Google Cloud ・Low-code: FlutterFlow, Bubble, Kintone ✅ DOMAIN EXPERTISE: ・Mobile Apps & Cross-platform Development ・AI-powered Applications & Workflow Automation ・SaaS & MVP Development ・Booking & Reservation Systems ・E-commerce & Marketplace ・Healthcare & Wellness Apps ・Real Estate & Property Management ・HRTech & Job Matching

I specialize in Kotlin/Java development with a strong focus on Android and Kotlin Multiplatform (KMP). I build scalable, maintainable, and high-performance applications using modern architectures and best practices. Key Skills & Expertise: - UI Development: Jetpack Compose, Custom Views - Architectures: Clean Architecture, MVVM, MVP, MVC, MVI - Dependency Injection: Dagger 2, Hilt - Networking: REST APIs (JSON, XML, Retrofit/OkHttp) - Social Media Integration: Facebook, Google - In-App Monetization: In-App Billing, Google AdMob - Database Management: SQLite, Room Database - Asynchronous Programming: Coroutines/Flow, RxJava2 - Multiplatform Development: Kotlin Multiplatform (KMP) - Multimedia & Media Player Integration - Version Control: Git - Other Tools & Libraries: A wide range of libraries to optimize app performance 🚀 Let’s Build Something Great! I’m open to discussing your project to see how my skills can bring your ideas to life. Contact me, and let’s make your app a success!