// Hello, world|Da Nang, Vietnam

Le Si Toan

full-stack developer intern / fresher

Final-year Software Engineering student with hands-on experience in full-stack development, with a strong focus on backend engineering. Passionate about building reliable systems, designing RESTful APIs, optimizing database queries, and developing applications capable of handling moderate workloads. Capable of working across the full stack, with a strong ability to learn independently and adapt to new technologies. Eager to contribute to real-world projects as a Backend or Full-stack Developer.

./contact_me→view projects ↓

developer.ts

const dev = {
  name: 'Le Si Toan',
  role: 'Full-stack Developer Intern / Fresher',
  location: 'Da Nang, Vietnam',
  education: 'DUT - Software Engineering',
  stack: ['Node.js', 'NestJS', 'Express.js', 'PostgreSQL', 'Next.js'],
  open_to_work: true
};

#technical_skills

// languages

JavaScript

TypeScript

SQL

Java

// backend

Node.js

Express.js

NestJS

Spring Boot

Prisma ORM

RESTful APIs

MVC

// frontend

Next.js

React.js

Tailwind CSS

Redux Toolkit

RTK Query

// databases & storage

PostgreSQL

MongoDB

Redis

// devops & tools

Docker

Nginx (basic)

Linux (Ubuntu)

GitHub Actions (basic)

Git

Postman

#projects

>./kieu-crochet-shop

Personal Project

Role: Full-stack Developer · 07/2026 — Present

repo ↗live demo ↗

Built and deployed an e-commerce platform for handmade crochet products, featuring a customer storefront and an admin dashboard for managing products, orders, payments, and store operations.

Storefront & Admin DashboardAutomated SePay QR PaymentsCI/CD & AWS EC2 Deployment

$ Key Architectural Implementations:

▸Automated payment matching through SePay, including payment verification and duplicate transaction checks. Unpaid orders expire automatically and release reserved stock back to the catalog.
▸Added background processing for order expiration and email and Telegram notifications, helping the shop handle payment confirmations and order changes with less manual work.
▸Delivered real-time order status and inventory updates with Socket.IO. Added Redis caching for frequently accessed categories, home products, and blog content to reduce repeated database queries.

// tech_stack:

TypeScriptNode.jsExpress.jsNext.jsPrismaPostgreSQLRedisBullMQSocket.IOAWS EC2DockerNginxCloudflareVercel

#work_experience

Full-stack Developer Intern @ STI Technology Solutions

08/2025 — 03/2026

▸Built backend APIs with Node.js, Express.js, MongoDB, and Redis to support core business features and data workflows.
▸Developed frontend interfaces and integrated them with backend services, exchange APIs, and WebSocket feeds from platforms such as OKX and MEXC to display real-time trading data.

Node.jsExpress.jsMongoDBRedisWebSocketsOKX & MEXC APIs

#education

The University of Danang – University of Science and Technology

Major: Software Engineering

09/2022 — Present

GPA: 3.0 / 4.0

Status: Final-year Student

#contact

// I am currently seeking Backend or Full-stack Developer opportunities at the Intern/Fresher level. Feel free to reach out!

gitlesitoan↗