Open to opportunities

Nguyen Thanh Dai

@nguyenthanhdai

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Full-Stack engineer building secure, scalable SaaS, AI agents, and Web3 products.

Vietnam

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What I'm looking for

I’m looking for a product-focused team where I can build secure, reliable full-stack systems and ship AI-powered features (RAG agents, semantic search, voice automation) while integrating payments and Web3 reliably in production.

I’m a Full-Stack Engineer with 6 years of experience building scalable backend systems, SaaS platforms, and cross-platform mobile applications. I deliver production-ready software that’s secure, reliable, and user-friendly.

My core strength is turning complex product needs into dependable APIs and integrations. I’ve built and optimized REST APIs and backend architecture using Python, FastAPI, NestJS, Node.js, and PostgreSQL, while working across authentication, device/application data, and third-party services.

I also specialize in AI-powered products, including AI agents, RAG chatbots, semantic search, LLM applications, and voice automation. I’ve integrated OpenAI APIs and vector search technologies, and implemented voice solutions using RetellAI, Twilio, and automation workflows to reduce manual support load.

On the product side, I’ve shipped Web3-enabled features such as prediction markets, perpetual trading platforms, NFT marketplaces, and blockchain data indexing. I’ve integrated Stripe and Shopify payment workflows (subscriptions, webhooks, transaction management) and built Circle.so communities with onboarding and membership automation using Zapier, n8n, and Make.com.

Experience

Work history, roles, and key accomplishments

AI & Full-Stack Developer

Mirimera

Oct 2025 - Jul 2026 (9 months)

Designed and updated backend APIs and database models for user accounts, authentication, device management, and application data. Built AI agents and chatbot features and developed web3 prediction, trading, and gaming platform features on Polygon.

Python fastAPI AI Agents Chatbot Document Processing Data Extraction Semantic Search Polygon Smart Contracts Web3 Crypto Wallets React Native Firebase Firestore Push Notifications TestFlight

Full Stack Developer

LYLY

Mar 2025 - Dec 2025 (9 months)

Architected scalable backend services using NestJS and Python, and built a RAG-based AI chatbot with hybrid retrieval. Integrated web3 features and payments (Stripe, Shopify), and built Circle.so communities and workflow automation (Zapier, n8n, Make.com).

NestJS Python REST APIs PostgreSQL RAG Embeddings BM25 Vector Search Semantic Search Web3 Smart Contracts Stripe Shopify Circle.So Zapier N8n Make.Com React

Backend Developer

Mirimera

Jan 2024 - Jan 2025 (1 year)

Developed and maintained scalable backend services, building secure REST APIs, authentication systems, and database models. Implemented payment workflows and backend systems for lottery/casino games, including game sessions, wallets, rewards, and real-time game events.

NestJS Python Java C#.NET ASP.NET Core REST APIs Authentication Systems Database Modeling Payments Webhooks Refund Processing Lottery Backend In Game Events Wallet Balance Unity

Freelance Full Stack Developer

Self-Employed | Multiple Clients

Jul 2023 - Dec 2024 (1 year 5 months)

Built responsive web applications and cross-platform mobile applications using React Native and Firebase. Implemented real-time data synchronization, Firebase services, Google Maps-based matching, and developed interactive web/mobile game projects.

React Native Firebase Firebase Authentication Firestore Push Notifications Google Maps REST APIs Game Logic Testing Debugging Deployment

Education

Degrees, certifications, and relevant coursework

Coursera

Project Management Certificate, Project Management

Completed a Project Management certificate through Coursera.

Asian Institute of Technology

Bachelor's degree, Mathematics and Computer Science

2018 - 2022

Studied mathematics and computer science while building web projects, including responsive sites for small businesses and contributions to Showfer.me using React, Firebase, and REST APIs.