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Fiverr Pro
English
$
USD
I will fix API bugs, custom coding, jwt oauth2 auth, mongodb, docker and typescript
Daniel
About this gig
Are API bugs, authentication errors, or backend issues slowing down your project?
I help businesses and developers fix, improve, and extend existing backend systems with clean, reliable custom coding. Whether you need API bug fixing, JWT or OAuth2 authentication, MongoDB integration, TypeScript development, Docker setup, or API security improvements, I can help.
Services I can help with:
- API bug fixing and custom coding
- JWT & OAuth2 authentication
- MongoDB integration
- TypeScript backend development
- Docker configuration
- API security improvements
- Backend troubleshooting
I focus on practical solutions that keep your backend stable and maintainable.
Contact me before placing an order so I can review your requirements and recommend the right solution.
Get to know Daniel
Daniel
Full Stack SaaS Development, Admin Dashboard, API Development!
- FromUnited States
- Member sinceJun 2026
- Avg. response time1 hour
Languages
English
I help businesses, startups, and entrepreneurs build secure, scalable full-stack web applications that solve real operational challenges. From SaaS platforms and admin dashboards to REST APIs, backend systems, and database integration, I deliver production-ready solutions using React, Node.js, and PostgreSQL. I focus on clean architecture, role-based security, and clear communication from scoping to delivery. Let's discuss your requirements before placing an order!
Other Software Development Services I Offer
FAQ
Can you fix an existing API or backend bug?
Yes. I can troubleshoot API bugs, custom coding issues, authentication errors, and backend problems.
Can you implement JWT or OAuth2 authentication?
Yes. I can implement or fix JWT and OAuth2 authentication for your backend and API.
Can you work with MongoDB and TypeScript?
Yes. I can develop and troubleshoot backend systems using MongoDB and TypeScript.
Can you help with Docker configuration?
Yes. I can configure Docker for your backend environment and help resolve deployment-related issues.
Can you improve my API security?
Yes. I can review common API security weaknesses and implement practical improvements.
Can you work with existing custom code?
Yes. I can inspect your existing codebase, identify the problem, and make the required changes.
Should I contact you before ordering?
Yes. Please contact me first with your requirements, existing code or error details so I can confirm the scope before you place an order.
