You will get fix full-stack web app issues (backend, frontend, API, database)
Project details
I will debug and fix issues in your React application quickly and professionally — whether it’s UI bugs, state problems, routing, API errors, or performance issues. I ensure stable, reliable fixes with clear communication.
Programming Languages
HTML & CSS, JavaScript, JavaCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$25
|
Standard
$50
|
Advanced
$90
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 4 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | - | - | - |
Content Upload | |||
Responsive Design | |||
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$10 - $20
Additional Revision
+$10Frequently asked questions
About Khanittha
Java Spring Boot Developer | API Errors Fix | Debugging | Performance
Chiang Rai, Thailand - 11:33 am local time
I help clients with:
✔ Fixing Spring Boot errors & exceptions
✔ Debugging REST APIs (400, 401, 403, 500 issues)
✔ Repairing JWT/OAuth2 authentication
✔ Solving CORS, routing, and request/response bugs
✔ Improving backend logic & performance
✔ Cleaning/optimizing existing code (monolithic or microservices)
Why clients trust me:
Clear communication
Fast and reliable bug fixing
Clean, maintainable code
Strong debugging ability (root-cause analysis)
Flexible with small tasks, short-term contracts, and long-term support
Based in Thailand, preparing to relocate to Germany — available worldwide for remote work.
Steps for completing your project
After purchasing the project, send requirements so Khanittha can start the project.
Delivery time starts when Khanittha receives requirements from you.
Khanittha works on your project following the steps below.
Revisions may occur after the delivery date.
Investigation & Reproduce Issue
I analyze the code, reproduce the bug, identify the root cause, and check all related components or API interactions.
Apply Fix & Improve Stability
I fix the issue, refactor if necessary, and ensure the fix doesn’t impact other parts of your React application.