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Senior Backend Engineer with 10+ years of experience designing and building scalable backend platforms and cloud-based distributed systems. Strong expertise in Java, Spring Boot, and microservices architecture with production deployments on AWS. Experienced in building high-availability APIs, event-driven systems, and real-time services. Proven ability to improve system performance, reliability, and security while collaborating with global engineering teams. TECHNICAL SKILLS Languages: Java (8–17), JavaScript Backend: Spring Boot, Spring MVC, JPA, Hibernate, Google Guice, REST APIs, Microservices, WebSocket Frontend: AngularJS, Angular, React Messaging: Kafka, RabbitMQ Cloud & Infrastructure: AWS (EC2, S3, SQS, SNS, Lambda, Cognito, SES), Docker Databases: PostgreSQL, MySQL Observability: Elasticsearch, Logstash, Kibana (ELK) Security: OAuth2, JWT, Keycloak, OWASP Top 10 DevOps: Jenkins, Azure DevOps, Git, Bitbucket

Commitment – Professionalism – Respect Hi there! I’m Giang. I’m new to Upwork, but not new to building real products. Outside this platform, I’ve delivered web applications from scratch to production for businesses of all sizes. Clean code, Code Quality & Optimization, Performance Engineering and systems that actually work – that’s my standard. Tech I master (daily used): - Java (Spring Boot) | NodeJS | C# (.Net Core) | ReactJS, NextJS | VueJS | TypeScript - SQL/NoSQL, REST APIs, DDD, Agile/Scrum - Testing (unit/integration) is part of my workflow – not an afterthought. I speak English & Japanese (conversational). Let me prove my value on a small milestone first. I’m available to start within 24h

Senior Java / Spring Boot developer with 1,000+ Upwork hours, 37 completed projects, a 100% Job Success Score, and a 4.9/5 client rating. I specialize in backend development, REST APIs, API integrations, and maintaining or extending existing Java/Spring applications. One of my long-term Upwork engagements has lasted 4+ years and 850+ hours, supporting and developing a Java open-source project. I’m comfortable working with existing codebases, understanding unfamiliar systems, fixing bugs, adding features, and delivering maintainable solutions without unnecessary rewrites. What I can help you with: • Java / Spring Boot backend development • REST API design and development • Spring MVC / Spring Framework • Hibernate / JPA and SQL • Third-party API integrations • Backend bug fixing and troubleshooting • Existing codebase maintenance and feature development • Refactoring and improving legacy Java applications • Unit testing with JUnit • Node.js backend development • React when full-stack work is required I’m particularly comfortable with projects where you already have an application and need an experienced developer to understand the codebase, fix issues, implement new features, or continue development. I value clear communication, clean code, practical solutions, and long-term collaboration. If you have an existing Java/Spring project that needs development or maintenance, send me the details and I’ll take a look.

I have worked at Upwork for around 3,500 hours with excellent ratings and feedback. I'm a responsible, passionate, and committed seasoned Java Angular developer with over ten years of experience. I am currently doing advanced JAVA Spring Boot, Laravel, Angular, React, Vuejs projects for major clients from the U.S. and Germany. I’m here to offer my skills and experience to help you grow and develop your business.

I have been working with Java language for around ten years on many aspects of Java from core java to J2EE, Java web, and also with some famous java framework such as Spring, Hibernate, Kafka, Elastic Search, Lucene, and many others. My experience technology stack: - Java - Spring Framework (Core, MVC, Boot, Security, Microservices, Cloud, OAuth) - Dropwizard - Hibernate - Restful and SOAP web service - Postgres, MySQL, MongoDB - JavaScript, TypeScript, Angular, ReactJS, NodeJS - DevOps - Jenkins, Docker, Kubernetes, GitOps - Cloud - AWS, GCP

I'm java expert over 15 years in many positions such as as programmer, freelancer, analyst, java team leader, product architect, project manager. I'm major on Document Output, Document Management System, Enterprise Content Management (ECM), Document Conversion fields, Digital Image processing. Besides that, i have lot of experiences and good skills in WDK (Windows driver kit) development, Alfresco ECM, Filenet ECM, Filenet BPM, Education, Transportation, Hotel Reservation, Human Resource, Business Process Management (BMP), Groupon, CRM (Customer Relationship Management). About technology stack, almost time, I have worked and researched in J2EE technology and Open Source Frameworks such as Cruise Control, Hudson, JBoss, Apache Tomcat, Apache server, Tomcat/ JBoss High available system (HA- clustering & load balancing between many web servers), BPM Activiti, Apache Axis, Apache Struts, Apache Ant, Apache Lucene, Java Server Faces, ZK (the very famous Ajax framework for Java), Vaadin, GWT, Selenium, JQuery, iText, PDFLib, JTOpen, Spring, Hibernate, JPA, Eclipse, MyEclipse. Several years go, i started working with LAMP stack. MongoDB, Php, Wordpress, WooCommerce, Yii are also my favorite language/framework. My favorite methodology to develop software product is Test Driven Development (TDD). Generally, I’m very eager to work with Java and Php. In addition to the practical experience, I achieved the Master degree in Computer Science field at the Natural Science University with “Optical Music Recognition” in July 2005.