Đậu Quốc Duy

I am pursuing my Bachelor of Science in Computer Science at Hanoi University of Science and Technology (HUST / ĐH Bách Khoa Hà Nội).

I am participating in the AI in Action (Cohort 3) program at VinUniversity, focusing on advanced AI systems, LLM agents, and practical AI applications.

I was a Software Engineer (Part-time) at DNSE Securities JSC.

• Built an AI-powered smart stock trading system using Golang (Gin Framework) within a microservices architecture integrated via Kafka.
• Designed and implemented real-time stock chatbot features leveraging Nakama WebSocket for interactive and scalable communication.
• Managed CI/CD pipelines with GitLab Runner and deployed microservices on Kubernetes, ensuring reliable delivery processes.

I built WalletCare AI — an AI Agent platform for e-wallet enterprises to automate transaction dispute investigation and customer support, demonstrated with a simulated e-wallet (VPay).

• Developed multi-step reasoning agent workflows using LangGraph and FastAPI with PostgreSQL database.
• Implemented Human-in-the-Loop approval and tool calling for zero-hallucination investigation.
• Built the web interface using Next.js and Tailwind CSS; containerized and deployed services using Docker on VPS.

For my graduation capstone project, I developed LangLearn AI — an intelligent language learning platform with FSRS spaced repetition, AI speaking buddy, and adaptive learning analytics.

• Developed RESTful APIs using Go (Gin), PostgreSQL, and Redis.
• Implemented FSRS algorithm and LLM integration for AI conversational practice and smart flashcards.
• Built web interface with React 19, TypeScript, and Tailwind CSS; containerized and deployed using Docker.

I developed backend systems for mobile applications:

• FatCat: Flashcard vocabulary learning application (Node.js, MySQL, AWS EC2).
• Benri: Grocery shopping and food inventory management application (Node.js, MongoDB, AWS EC2).

A summary of technical tools and technologies I work with:

• Back-End: Golang, Node.js, Java, Microservices Architecture, Apache Kafka, WebSocket, Nakama, RESTful APIs, Redis.
• Databases: PostgreSQL, MySQL, MongoDB.
• Front-End: Flutter (MVVM architecture), React 19, Next.js, TypeScript, Tailwind CSS.
• DevOps / CI-CD: GitLab CI/CD, GitLab Runner, Docker, Kubernetes, AWS EC2, Git.
• AI Engineering: LangGraph, LLM integration, Prompt Engineering, Claude Code, Cursor AI.
• Languages: English (VSTEP B1 ~ TOEIC 550), Japanese (JLPT N4).