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Fiverr Pro
English
$
USD
I will fix rest API, backend, webhook and API integration bugs
Heiev Heg
About this gig
Many web applications fail because of broken APIs, webhook errors, authentication issues, or backend bugs that prevent data from flowing correctly. These problems can disrupt your application, affect user experience, and delay your project.
I will diagnose and fix REST API, backend, webhook, and API integration issues in your Node.js and Express application. Whether you're dealing with API errors, failed requests, authentication problems, database issues, or unexpected server behavior, I'll work to identify the cause and implement a reliable solution.
What I can help with:
- REST API bug fixing
- Backend debugging
- API integration issues
- Webhook troubleshooting
- JWT authentication errors
- Express.js issues
- MongoDB connectivity
- Code optimization and cleanup
I focus on clean, maintainable solutions and clear communication throughout the project.
Please contact me before placing an order so we can review your issue and choose the right package.
Get to know Heiev Heg
Heiev Heg
Nodejs Backend Developer, REST API, GraphQL and API Integration Expert
- FromUnited States
- Member sinceJun 2026
- Avg. response time1 hour
Languages
Spanish
I am a dedicated Backend Developer specializing in Node.js, Express.js, REST APIs, GraphQL, and API integration. I build secure, scalable, and high-performance backend solutions tailored to your business needs. Whether you need custom API development, third-party API integration, backend bug fixes, database integration, or application optimization, I focus on delivering clean, maintainable code with clear communication and on-time delivery. My goal is to provide reliable backend solutions that help your web applications perform efficiently and scale with confidence.
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FAQ
Can you fix existing REST APIs?
Yes. I troubleshoot and fix issues in existing REST APIs, including routing, authentication, database connections, and request handling.
Do you work with Node.js and Express?
Yes. I specialize in debugging and improving Node.js and Express backend applications.
Can you fix API integration issues?
Yes. I can diagnose integration problems, identify the root cause, and resolve issues where possible.
Do you provide custom backend development?
Yes. If your project requires additional backend work beyond bug fixing, please contact me for a custom offer.
Should I contact you before ordering?
Yes. Please message me first so I can review the issue and recommend the right package.
