Guy Le - Senior Java Developer

I am a software engineer with 8 years of experience in backend engineering, proficient in Java/Groovy with the Spring Framework and 2 years of experience in front-end development. Learning new languages and technologies is my passion. I am considered a team player because I like to help others and tend to work well within a group. I can also handle mentoring tasks and conduct code reviews for other team members.

Project list

Aviation project - United States

A dashboard for flight schedule and booking management system for private aircraft in the United States.

- Based on the rules provided by customers, built a local SonarQube instance to scan code quality and wrote unit tests to improve code coverage and branch coverage. - Wrote automated tests with Selenium and verified test cases using TestNG - Integrated with Salesforce work flow to send email marketing - Onsite in the US for 6 months to guide and transfer code

Technologies: Java, Spring Boot, Selenium, JUnit, Docker, Angular

Bingcoins - Crypto Exchange

A finance application where users can exchange cryptocurrency and fiat using a P2P protocol, functioning as a marketplace.

- Built the foundational architecture for a project in a microservices system, which includes a website application for end users and a CMS for admins - Interacted with smart contracts using the web3.js library - Built docker and dockerfile to pack images and using Dokku to deploy on VPS

Technologies: Java, Spring Boot, Docker, MongoDB, Redis

Hoc68

Education project - examination and online course system with over 50 thousand active users per month.

- Provided the entire solution architecture to develop an online course and examination testing system. - Built a microservices system capable of supporting 2000 concurrent users taking exams and engaging in real-time chatting - Buit Jenkins and SornaQueue as a CICD to track quality of code and deployment

Technologies: Java, Microservices, Docker, Spring Boot, MongoDB, Redis

An E-commerce system - Singapore

Provide services as a restul API to a web appliation can integrate.

- Implemented a service to calculate fees. - Suggestion some boxes for packing, solved the 3D bin packing problem using the LAFF algorithm - Write a service as a transformation library, - Implemented logic for e-commerce business

Technologies: Microservices, Node.js, DynamoDB, Lambda, Serverless, MySQL

Booking engine

Booking engine for hotels, flights, and activities that accepts payment by cryptocurrency.

- Applied Redis to cache static data and reduce traffic into database - Switched the JWT token algorithm from symmetric to asymmetric to reduce the authentication responsibilities of the authentication service - Improve quality of code by P2P reviews. - Using the Secrets Manager service on AWS instead of properties file in from Spring Boot for more secure storage of private keys - Monitored the database using SigNoz to identify queries that exceeded the performance threshold. Utilized DBeaver for query explanation and analysis, calculated query costs, and applied indexing to improve query performance - Write a scheduler to remove outdated indexing after it has not been used for a long time - Develop new service as a gateway in crypto currency. - Applied WebSocket to build a real-time voting service

Technologies: Java, Microservices, Spring Boot, Redis, PostgreSQL, S3, ECS, Docker, Git, Jenkins

Car Booking

A realtime system to bidding booking car.

- Base on monolithic architecture and built backend system as a Restful API with Spring MVC - Base AnguatJs for Web application - Base android application project with Java/kotlin.

Technologies: Spring Framework, MongoDB, Angular

Project list

Education

Techstacks