Summary

Senior Java Developer with over 8 years of hands-on experience in designing, developing, and maintaining scalable web applications. Proven track record across multiple projects, allowing me to build a solid foundation in both back-end and front-end development. I’m a fast learner, quick to adapt to new technologies and environments, and always eager to take on challenging roles that push my limits and contribute to impactful solutions.

Technical proficiencies

Programming Languages: Java, JavaScript, TypeScript. 

Skills: 

  • Java, JavaScript, Java framework for application development (Spring, Play, PrimeFaces)
  • JPA, Hibernate, Ebean
  • JUnit, Mockito, PowerMock
  • Oracle, MS SQL Server, MySQL, PostgreSQL
  • Kafka, RabbitMQ
  • Cloud (AWS), Microservices
  • CICD, Jenkins, Nginx, HA Proxy  
  • MongoDB, Redis, Cassandra, Elasticsearch
  • Object-oriented methodology, System Analysis and Design 
  • Multi-threaded programming
  • Single Page Application (Web-based), RESTful API, SOAP
  • Front-End development: Angular, ReactJS
  • SSO, GIS, JWT, OAuth
  • Agile development

Tools: Visual Studio Code, Sublime Text, Git, Eclipse, IntelliJ IDEA, Vim, pgAdmin, Workbench, Oracle Developer, Visual Studio, Trello

Professional experience

Human Resource Management – Korea

Full-stack Developer, Nov 2021 – Oct 2022

Project description 

  • Working on a team including 1 PM, 1 Team Leader, 5 Developers and 2 Tester, 1 BA. 
  • We were tasked to work as a full-stack developer to build a Web Application for Human Resource Management using internal Java Framework. 

Responsibilities 

  • Development and client communication 
  • Analyzed business requirements and collaborated with the team to design effective software architecture.
  • Provided technical support in adopting new technologies, implementing plugins and services, and resolving development issues.
  • Ensured timely and accurate delivery of project milestones.
  • Conducted research and established foundational structures for web applications.
  • Participated in feature development, including task implementation and clarification with stakeholders.
  • Identified, debugged, and resolved software defects; provided ongoing maintenance and support.
  • Collaborated with team members to maintain and enhance existing functionalities based on customer requests.
  • Trained new team members and mentored junior developers to accelerate their onboarding and growth.

Technologies 

  • Web application. 
  • Java, Spring Framework, BizActor, Web API, Web Service for back-end 
  • JSP Web application, JavaScript 
  • MariaDB
  • AWS
  • Eclipse

E-commerce – Australia

Java Developer, June 2021 – Nov 2021

Project description 

  • Working on a team including 1PM, 2 Developers. 
  • We were tasked to build and maintain an E-Commerce Web Application

Responsibilities 

  • Managed the Payment module, including integration with third-party Payment Gateways using the OSGi modular architecture.
  • Engaged in client communication to gather requirements, provide updates, and ensure alignment with project goals.  
  • Analyzed business and technical requirements; collaborated with the team to design scalable and maintainable software architecture.  
  • Supported the team in adopting new technologies, implementing OSGi plug-ins and services, and troubleshooting development issues.
  • Ensured timely and accurate delivery of features, meeting project milestones and quality standards.
  • Conducted research and established foundational structures for web applications to support long-term scalability and performance.
  • Implemented functional features based on specifications and clarified ambiguous requirements when needed.
  • Identified and resolved bugs; provided maintenance and continuous support for stable application performance.
  • Collaborated on enhancing and extending existing modules based on customer change requests.
  • Assisted team members and contributed to a collaborative development environment.

Technologies 

  • Spring Boot
  • Kill Bill (OSGi)
  • Kafka
  • AWS
  • RESTful API
  • MongoDB, MySQL

Electricity Retail Management – Australia

Java Developer, Feb 2021 – June 2021

Project description 

  • Working on a team including 1 PM, > 50 individuals including Developers, Testers and BA
  • We were tasked to build and maintain a Web Application to manage electricity retail (reading Meter, billing, generate report, commission,...)  

Responsibilities

  • Maintained an asynchronous processing system utilizing Java Jobs and MySQL transactions, ensuring data consistency and reliability.  
  • Designed and implemented new product features according to business and technical requirements.  
  • Investigated and resolved system bugs; provided ongoing maintenance and technical support to team members.
  • Executed manual operational tasks, such as commission generation and other administrative processes, to support business operations.

Technologies

  • Play Framework
  • AngularJS
  • AWS
  • MySQL
  • Cassandra
  • Ebean
  • RESTful API
  • Gitlab CICD

Digital Map Platform – Vietnam

Full-stack Developer, Apr 2019 – Feb 2021

Project description 

  • Working on a team including 1 PM, 5 Developers, 1 Testers and 1 BA
  • We were tasked with building and maintaining a Map Platform for displaying Vietnam Map including collected data such as POIs and roads, navigation, searching location,...

Responsibilities

  • Designed and built systems based on the Netflix Microservice Architecture, ensuring scalability, resilience, and service independence.
  • Developed and maintained backend APIs, supporting core business functionalities and seamless integration between services.
  • Implemented a search system using Elasticsearch to enable high-performance, full-text search capabilities.
  • Customized and integrated Keycloak for user authentication and authorization; supported frontend integration to deliver secure, role-based access control.
  • Deployed applications using Jenkins, automating CI/CD pipelines in both Docker Swarm and Kubernetes environments.
  • Wrote complex SQL queries and developed Stored Procedures to support data processing and reporting requirements.

Technologies

  • Spring Boot
  • Netflix Microservice Architecture
  • Angular 8
  • Keycloak
  • Geoserver
  • Elasticsearch
  • Redis
  • Mapbox
  • MySQL
  • PostgreSQL
  • Docker Swarm
  • Kubernetes
  • Jenkins. 

Online Entertainment and Social Media Platform – Germany

Java Developer, Jun 2020 – Oct 2020

Project description 

  • Working on a team including 1 PM, 2 Developers
  • We were tasked to build an online platform where users share and enjoy humorous and entertaining content, supporting social login and commenting features

Responsibilities

  • Implemented complete sets of backend APIs, supporting core features and system integration.
  • Developed a search feature using Elasticsearch, enabling efficient and scalable search functionality.
  • Built a media management module integrated with MinIO, ensuring secure and efficient file storage and retrieval.
  • Applied Redis caching strategies to enhance application performance and reduce database load.
  • Deployed applications using Jenkins, automating build and deployment processes for reliability and efficiency.
  • Optimized database performance by refactoring and tuning Stored Procedures, improving query execution and overall system responsiveness.

Technologies

  • Spring Boot
  • Nuxt.js
  • MySQL
  • MinIO
  • WebSocket
  • Elasticsearch
  • Redis
  • Jenkins

Waste Operation Management – Germany

Java Developer, Sep 2018 – Mar 2019

Project description 

  • Working on a team including 1 PO, 1 SM, 5 Developers
  • We were tasked to build and maintain a Web Application for a Waste Management Industry  

Responsibilities

  • Communicated directly with the Product Owner (PO) to gather and clarify business requirements.
  • Translated customer requirements into technical specifications and implemented corresponding code.
  • Performed hands-on software development, ensuring code quality and alignment with project standards.
  • Provided weekly progress reports and proposed solutions to the PO via Skype meetings.
  • Actively identified and resolved technical issues, contributing to the stability and success of the project.

Technologies

  • Axon Ivy (PrimeFaces)
  • SQL Server
  • Docker
  • Jenkins
  • JavaScript

Credit Data Provision for Europe – Germany

Java Developer, May 2018 – Aug 2018

Project description 

  • Working on a team including 1 PO, 1 SM, 5 Developers
  • We were tasked to build and maintain a platform for Credit Information

Responsibilities

  • Collaborated with the Product Owner (PO) to gather and clarify functional and technical requirements.
  • Developed features and implemented code based on customer specifications and project goals.
  • Delivered clean, maintainable code aligned with best practices and performance standards.
  • Conducted weekly progress updates and proposed technical solutions to the PO via Skype.
  • Actively addressed and resolved development challenges, contributing to overall project success.

Technologies

  • Spring Webflow (Java)
  • SOAP
  • Elasticsearch
  • XSLT
  • Oracle

Project and Customer Management – Vietnam

Java Developer, Jan 2018 – Apr 2018

Project description 

  • Working on a team including 1 PO, 1 SM, 5 Developers, 1 Designer
  • We were tasked to build and maintain a Web Application to manage project and customer

Responsibilities

  • Communicated with the Product Owner (PO) and Scrum Master (SM) to gather and clarify requirements.
  • Collaborated with the team to analyze and break down requirements into manageable development tasks.  
  • Developed backend APIs using Spring Boot, ensuring scalability, performance, and clean architecture.
  • Implemented frontend features using Angular, delivering responsive and user-friendly interfaces.
  • Researched and integrated Single Sign-On (SSO) using Keycloak, with support for LDAP authentication.
  • Diagnosed and resolved technical issues across the stack to ensure system stability.
  • Deployed applications using Docker and Jenkins, supporting continuous integration and delivery workflows.

Technologies

  • Spring Boot
  • Angular
  • Keycloak
  • LDAP
  • Docker
  • Jenkins
  • PostgreSQL  
Certifications

AWS Certified Solutions Architect Associate (2022)

AWS Certified Cloud Practitioner (2022)

Certificate of Completion Course Nano (2022)

Degree AWS Cloud Architect (2022)

TOEIC 770 (2019)

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Navigating OurCooperation Models

We assess your needs first. Then, we will send you the top software engineer CV options so that you can select your favorite. The chosen engineer becomes part of your in-house team.

Ideal for businesses that:
Need specialized expertise but don't want to hire full-time staff
Want to scale resources up and down quickly
Require extra support for upcoming or ongoing projects
You can choose from our numerous software developer CV options. The selected developers form a dedicated team that works exclusively on your project. They also collaborate closely with your in-house team to achieve your goals.

Ideal for businesses that:
Require cost-effective and scalable solutions for large and long-term projects
Want to form a consistent team with excellent skills
Need a development team committed to their business goal
We define a clear path for your project. Since the project has clear timelines and scopes, you can control your budget better. You can also choose to work with a remote team or manage specialized technical roles.

Ideal for businesses that:
Have a set budget and clearly outline the project scope
Struggle with strict deadlines
Handle projects with clear goals, a detailed outline, and achievable milestones
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