Guy Le - Senior Java Developer

Guy Le

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Guy Le

4.9

Age

Gender

Male

Address

Hanoi, Vietnam

Main expertise

Java Spring Spring Boot Back-end Backendless AWS Lambda AWS Cloud AWS Amazon S3 Angular Microservices AWS DevOps

Introduction

Guy Le is a seasoned software engineer with 8 years of experience in backend engineering, specializing in Java/Groovy and the Spring Framework. He also has 2 years of experience in front-end development. Guy is passionate about learning new languages and technologies, and is known for being a team player who enjoys collaborating with others. He is adept at mentoring and conducting code reviews for team members.

Project list

Flight Schedule and Booking Management System - United States

Developed a comprehensive dashboard designed for managing flight schedules and booking systems for private aircraft operating 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 workflow to send email marketing. Worked onsite in the US for 6 months to guide and transfer code.

Technologies: Java servlet, Spring boot, Salesforce, Angular 4+, Selenium, JUnit, Mockito, Powermock, SonarQueue, Docker, TestNG

Bingcoins - Cryptocurrency Exchange Platform

A financial application that allows users to exchange cryptocurrencies and fiat currencies using a peer-to-peer protocol, serving as a marketplace.

Built the foundational architecture for a project within 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. Created Docker images and Dockerfiles to package applications and used Dokku for deployment on a VPS.

Technologies: Java/Groovy, Microservices, PAAS on Dokku, Springboot, Redis, MongoDB, ActiveMQ and Pebble template engine, web3js

Hoc68 Online Course and Examination System

An education project focused on developing an online course and examination testing system, catering to over 50,000 active users monthly.

Provided the entire solution architecture to develop an online course and examination testing system. Built a microservices system capable of supporting 2,000 concurrent users taking exams and engaging in real-time chatting. Implemented Jenkins and SornaQueue as a CI/CD pipeline to track quality of code and deployment.

Technologies: Java 8, Microservices, Docker, Spring boot, MongoDB, RabbitMQ and Redis

E-commerce System Development - Singapore

Provided RESTful API services to enable seamless integration with web applications.

- Implemented a service to calculate various fees. - Suggested optimal packing boxes by solving the 3D bin packing problem using the LAFF algorithm. - Developed a transformation library service. - Implemented core business logic for e-commerce functionality.

Technologies: Microservices, NodeJS, DynamoDB, AWS Lambda, Serverless framework, MySQL

Hotel and Travel Booking Engine

A comprehensive booking platform for hotels, flights, and activities with support for cryptocurrency payments.

Applied Redis to cache static data and reduce traffic to the database. Switched the JWT token algorithm from symmetric to asymmetric to reduce the responsibilities of the authentication service. Improved code quality through peer-to-peer reviews. Used AWS Secrets Manager for secure storage of private keys, replacing properties files in Spring Boot. Monitored the database with SigNoz to identify queries exceeding the performance threshold, using DBeaver for query explanation, analysis, and indexing to improve performance. Developed a scheduler to remove outdated indexing after prolonged inactivity. Developed a new service to act as a gateway for cryptocurrency transactions. Implemented WebSocket to create a real-time voting service.

Technologies: Java 8 - 11, Microservices, Spring boot, Vertx, Redis, RabbitMQ, Git, Blockchain, Smart contract, Jenkins, SigNoz, Secret Manager, S3, Session Manager, Cloudwatch, Hibernate, PostgreSQL

Car Booking System

A real-time system for booking cars with a bidding feature.

Base on monolithic architecture and built backend system as a Restful API with Spring MVC. Base AngularJS for Web application development. Developed Android application project using Java/Kotlin.

Technologies: Spring MVC, JSP, Java Websocket, MongoDB, Android and Angular JS, Tomcat

Project list

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