You will get Java Spring Boot Backend Developer for REST APIs, Bug Fixes & Integrations
Project details
I will help you build, fix, improve, or extend your Java/Spring Boot backend application. This is ideal if you already have an existing codebase and need an experienced backend developer to understand it quickly, fix bugs, add features, improve REST APIs, or integrate third-party services.
Programming Languages
HTML & CSS, JavaScript, JavaCoding Expertise
PSD to HTML, Performance Optimization, DesignWhat's included
| Service Tiers |
Starter
$100
|
Standard
$400
|
Advanced
$900
|
|---|---|---|---|
| Delivery Time | 1 day | 3 days | 14 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 3 | 6 | 15 |
Design Customization | |||
Content Upload | |||
Responsive Design | |||
Source Code |
Frequently asked questions
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WD
Willyzd D.
Jul 8, 2026
JavaScript / frontend Guru
Good job!
BY
Bünyamin Y.
May 6, 2025
Running and some customizations of a java project
SV
Shwetank V.
Mar 25, 2025
Resolve CAPTCHA in Test Automation
TB
Thierry B.
Oct 11, 2024
Simple Javascript to create
Thanh did a wonderful job on our project, would not hesitate to work with again.
JS
Jesse S.
Jul 11, 2024
Create a Java connect API for Bookmap
Job well done!
About Thanh
Senior Java / Spring Boot Backend Developer | APIs & Integrations
100%
Job Success
Ho Chi Minh City, Vietnam - 6:11 am local time
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.
Steps for completing your project
After purchasing the project, send requirements so Thanh can start the project.
Delivery time starts when Thanh receives requirements from you.
Thanh works on your project following the steps below.
Revisions may occur after the delivery date.
Send requirements so Thanh can start the project.
Delivery time starts when Sudesh receives requirements from you.
Thanh works on your project following the steps below.
Project planning Design and UI/UX Front-end development Back-end development Database developemnt Testing Security and Authentication Deployment Project Delivery and Launch