Đỗ Hoàng Long

Backend developer

About me

Backend Developer with a proven track record of delivering robust, maintainable, and high-performance backend systems.
Deep expertise in Java, PHP, JavaScript, and TypeScript, with the ability to choose and apply the right technology stack for each project.
Extensive hands-on experience with frameworks such as Spring Boot, Laravel, and Express.js, enabling rapid development and scalable architecture design.
Strong database design and optimization skills (MySQL, PostgreSQL, MongoDB), ensuring fast and reliable data handling.
Proactive problem solver who can quickly identify bottlenecks and implement efficient solutions, improving system performance and user experience.
Collaborative team player with experience in Agile/Scrum workflows, contributing to faster delivery and higher code quality.
Passionate about continuous learning, staying ahead of industry trends, and bringing innovative ideas to enhance product value.

Backend	Frontend	DevOps
Languages: Java(OOP, Multithread), PHP, Typescript Framework: Spring boot(Spring security, Thymleaf, JPA/ hibernate, JWT, OAUTH2), Laravel, Expressjs, Nestjs Database: MySQL, SQL Server, PostgreSQL, Redis, MongoDB Testing: JUnit, Mockito API: RESTful API, SOAP, GraphQL, WebSocket Pattern: MVC, Repository, Singleton, Builder, DI, DTO Architecture: Layered Architecture, Client-Server, Monolithic, Microservices	Framework: React-Vite(Axios, Router), Redux, Tailwind CSS(Responsive), Nextjs Development stack: HTML, CSS, Javascript	Tools: Git(CI/CD), Docker(docker compose) Cloud and deployment: AWS (EC2, S3, RDS), Vercel, Render
AI tools: ChatGPT, Grok Debug tools: Postman, JMeter Version control Github, Gitlab Methodologies: Scrum, Agile, Waterfall

Project informations

Connect Coffee is a café management system focusing on user management, authentication, and authorization.
Team size: 5
Role: Backend developer

Technologies

Backend: Flask(Flask-Security, Flask-Login, Flask-RESTful, Flask-JWT-Extended)
Frontend: React(Axios, Router, useState)
Database: SQL server

Responsibilities

Designed and implemented RESTful APIs for Connect Coffee, a café management system, using Flask, React and SQL server.
Developed role-based access control (RBAC) using Flask-Security and Flask-JWT to secure endpoints for admin, sale, manager .
Collaborated with frontend team to integrate authentication/authorization flows with React.
Participated in daily standups and sprint reviews using Agile methodology.

Main contributions

Designed database schema and API endpoints for user registration, login, and role assignment.
Implemented secure authentication and authorization flows.

Project informations

Sale manager is a convenience store management application that streamlines sales operations, inventory tracking, and user management with secure authentication and authorization features. It have 4 roles(Admin, Manager, Sale, Customer)
Team size: 1
Role: Fullstack developer

Technologies

Backend: Spring Boot(RESTful), Spring JPA/ hibernate, Spring security, JWT
Frontend: React-Vite(Router, Axios, Interceptor,), Tailwind CSS(Responsive layout), Redux
Database: MySQL
Tool && Deployment: Git, Docker, AWS EC2

Responsibilities

Developed authentication and authorization features using JWT with Spring Security
Built RESTful APIs using Spring Boot
Managed data persistence with Spring Data JPA and Hibernate
Built the user interface using React with Vite for fast development
Handled user login/logout flows and route protection based on user roles
Designed responsive UI with Tailwind CSS
Managed global state using Redux
Implemented token refresh mechanism using refreshToken when accessToken expires which helped maintain seamless user session and improved security
Configured Axios interceptors to automatically attach tokens and handle token expiration

Achivements