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$
USD
I will develop secure asp net core web api and backend in c sharp
Kiramat Ullah
About this gig
Need a reliable ASP.NET Core API or help fixing your .NET backend? I build secure, maintainable APIs in C# with clear scope and tested delivery.
I have 3+ years of full stack .NET experience, including enterprise ABIS development and SachAI, an AI video authenticity product I independently built.
What I can help with:
- REST API endpoints and third-party integrations
- EF Core with PostgreSQL or SQL Server
- Input validation and error handling
- JWT authentication and role-based access
- API debugging and query optimization
- Hangfire background jobs
Basic: one reproducible bug fix or one simple endpoint.
Standard: up to 3 endpoints with database integration.
Premium: up to 6 endpoints with JWT authentication and API documentation.
All packages include source code. Revisions cover the agreed requirements; new features require a separate quote. Hosting costs and paid third-party services are excluded.
Please message me on Fiverr before ordering so we can confirm requirements, scope and delivery.
Get to know Kiramat Ullah
Kiramat Ullah
Full Stack Developer ASP NET Core React and Angular
- FromPakistan
- Member sinceOct 2026
- Avg. response time1 hour
Languages
English
I am a Full Stack .NET Engineer with 3+ years of experience building secure APIs, web apps and WPF desktop solutions using C#, ASP.NET Core, React, Angular, PostgreSQL, SQL Server and EF Core. I contribute to ABIS, a government biometric system with 40+ million records, and independently built SachAI, an AI video authenticity platform. I offer API development and integration, bug fixes, database optimization, JWT authentication, background processing and full stack development. Expect maintainable code, clear communication and reliable delivery.
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FAQ
What do you need to start?
Please share the required endpoints, expected behavior, database choice and any existing code or API documentation. For bug fixes, include reproduction steps and error details. Do not send production passwords or API keys in chat.
Can you work on an existing ASP.NET Core API?
Yes. Share your .NET version, sanitized source code, database provider and expected behavior. For bugs, provide reproduction steps. I will review compatibility and confirm the endpoint or fix scope before you order.
Which databases and authentication can you implement?
I work with EF Core, PostgreSQL and SQL Server. JWT authentication and role-based authorization can be included within the agreed package scope. Schema changes, data migration and additional integrations must be specified before ordering.
Does this include a frontend, hosting or unlimited revisions?
All packages include unlimited revisions to the agreed ASP.NET Core backend requirements and source code. Extra endpoints or new features need a separate scope. Frontend development, hosting fees and paid services are separate.
