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Fiverr Pro
English
$
USD
I will fix your rest API integration and stabilize your backend
Pedro A
About this gig
Need a reliable API that your team can actually build on?
I design and develop clean, secure and well-structured REST APIs using C# / ASP.NET, PHP or Python (FastAPI) built for real business needs, not just demos.
What I can build for you:
- REST APIs with layered architecture (Controllers, Services, DTOs)
- Secure endpoints with JWT auth, API keys and middleware filters
- Database-connected APIs SQL Server, MySQL with stored procedures
- API consumption connect your system to any third-party service (payments, CRM, SMS, etc.)
- API exposure publish your own data or logic for other apps to consume
- API documentation (Swagger / Postman collections)
- Hybrid integrations (PHP frontend + ASP.NET backend)
Why hire me:
- Built APIs in a Microsoft Partner company under corporate standards
- Full SMS integration individual sends, mass campaigns, direct CRM sync
- Python FastAPI with Docker, layered architecture and Swagger docs
- Security-first: middleware, input validation, structured error handling
Tech stack: C# / ASP.NET, PHP, Python + FastAPI, SQL Server, MySQL, JWT, Docker, Git
All packages include: Source code, comments, deployment instructions and post-delivery support.
Get to know Pedro A
Pedro A
Backend Developer
- FromMexico
- Member sinceNov 2025
Languages
English, Spanish
Backend & API Integration Specialist | Performance Optimization Expert
I help businesses build stable, scalable and high-performance backend systems.
With experience in enterprise environments, I specialize in:
• ASP.NET / C# backend development
• REST API design & integration
• SQL Server performance optimization
• Middleware architecture
• Business logic automation
I focus on clean architecture, performance efficiency and production-ready solutions.
If you need reliable backend support — let’s work together!
Other Software Development Services I Offer
FAQ
What do I need to provide to get started?
A description of what the API should do, the endpoints you need (or a general idea), which database or systems it should connect to, and any auth requirements.
Can you integrate with a third-party API I already use?
Yes! Share the documentation or credentials and I'll handle the integration. Covered in the Premium package or as a Gig Extra.
Can you work with my existing codebase?
Yes. I have experience extending legacy systems and hybrid stacks. Share your repo and I'll assess compatibility before we start.
Will I receive documentation?
Standard and Premium packages include Swagger UI documentation and/or a Postman collection with all endpoints and request/response examples.
Which technology do you recommend, ASP.NET, PHP or FastAPI?
Depends on your stack. ASP.NET for enterprise/Windows environments, FastAPI for Python-based or microservice architectures, PHP if your existing system already uses it.
