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I will fix nodejs, API, html, backend bugs, database error, and server issues fast
Antonio
About this gig
Backend problems can quietly damage your website performance, break user functionality, and create a frustrating experience for customers. If your API is failing, database queries are slow, authentication is broken, or your server keeps throwing errors, I can help you solve the issue professionally.
I specialize in backend debugging and API troubleshooting for modern web applications built with Node.js, Express.js, and related technologies. My focus is not only fixing the visible problem but also identifying the actual root cause to prevent the issue from returning again.
Services I Provide:
- Node.js bug fixing
- API error resolution
- Database troubleshooting
- Authentication and login issues
- Server-side debugging
- Express.js backend fixes
- Performance optimization
- JSON and fetch errors
- Backend functionality repairs
Why Clients Choose Me:
- Clean and scalable fixes
- Fast communication
- Optimized backend performance
- Reliable and secure solutions
Every project is handled carefully with attention to stability, security, and long-term functionality.
Contact me before placing an order so I can review the issue and recommend the best solution for your backend system.
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know Antonio
Antonio
Full Stack Web Developer and Bug Fix Specialist
- FromSpain
- Member sinceJun 2026
Languages
English, Spanish, German
I'm a professional Full Stack Web Developer with expertise in fixing website bugs, coding errors, and performance issues across modern web technologies. I specialize in HTML, CSS, JavaScript, React.js, Next.js, Node.js, Express.js, WordPress, WooCommerce, APIs, databases, and server troubleshooting. Whether you're facing a white screen, plugin conflict, frontend or backend bug, responsive design issue, API integration problem, or database error, I provide fast, clean, secure, and reliable solutions with clear communication, quality work, and on time delivery.
FAQ
What backend technologies do you work with?
I work with Node.js, Express.js, APIs, databases, authentication systems, and modern backend web applications.
Can you fix API connection and response issues?
Yes, I troubleshoot failed API requests, JSON errors, authentication problems, and backend/frontend communication issues.
Do you fix database related problems?
Yes, I can resolve database connection issues, query errors, slow performance, and backend data handling problems.
Will you test the backend after fixing the issue?
Absolutely. I test the functionality carefully to ensure the backend works properly and the issue is fully resolved.
What do you need before starting the project?
I may need server access, source code, API documentation, error logs, screenshots, or a detailed explanation of the issue.
