You will get a reliable diagnosis and fix for your Java or Spring Boot backend issue
Project details
I will diagnose a Java or Spring Boot backend issue and provide a practical, clearly explained result. This service is suitable for exceptions, incorrect API behavior, configuration problems, MySQL-related failures, performance bottlenecks, and bugs in an existing backend codebase. Depending on the selected tier, you will receive root-cause analysis, a written fix plan, a focused code fix, and relevant tests or review. I work carefully with existing systems and aim for a minimal, maintainable solution without changing unrelated behavior. Please remove credentials, personal data, and company secrets before sharing files.
Programming Languages
JavaCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$20
|
Standard
$50
|
Advanced
$90
|
|---|---|---|---|
| Delivery Time | 1 day | 2 days | 3 days |
Number of Revisions | 0 | 1 | 2 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Frequently asked questions
About Haohui
Java Backend Developer | Spring Boot, REST APIs & Microservices
Beijing, China - 5:18 pm local time
I help clients build, troubleshoot, and improve reliable backend services. My experience includes fulfillment and supply-chain systems, API integration, production issue diagnosis, database analysis, and service reliability.
I can help with:
- Java and Spring Boot backend development
- REST API design and integration
- Microservice debugging and performance analysis
- MySQL and SQL troubleshooting
- Scripts, utilities, and backend maintenance
- Supply-chain and fulfillment workflows
I communicate clearly, work carefully with existing codebases, and focus on practical fixes with minimal impact on unrelated logic.
Steps for completing your project
After purchasing the project, send requirements so Haohui can start the project.
Delivery time starts when Haohui receives requirements from you.
Haohui works on your project following the steps below.
Revisions may occur after the delivery date.
Reproduce and diagnose the issue
I review the materials, reproduce the problem when possible, and trace the root cause across the relevant code, configuration, database behavior, and logs.
Deliver the agreed report or code fix
I provide a clear diagnosis and, for Standard or Advanced, a focused maintainable fix that avoids unrelated behavior changes.