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I will develop secure asp net core web API and rest API
Sushil Kumar
About this gig
Need a reliable REST API or backend service built with ASP.NET Core?
I am a Senior .NET Consultant with 20+ years of experience developing enterprise applications, APIs and backend systems. I can develop or enhance APIs using:
- ASP.NET Core Web API
- C# and .NET
- RESTful APIs
- Entity Framework Core
- Dapper
- SQL Server
- JWT authentication and authorization
- Third-party API integrations
- API validation and error handling
- Database integration
- Existing API enhancement and troubleshooting
Whether you need a new API endpoint, a complete backend service, integration with an external system, or improvements to an existing API, I can help. My focus is on clean, maintainable and scalable code that is suitable for real-world production applications.
I can also troubleshoot existing APIs that are slow, returning incorrect results, failing authentication, or experiencing integration problems.
Please contact me before ordering so we can discuss your requirements and determine the appropriate package.
Get to know Sushil Kumar
Sushil Kumar
Senior DOT NET Developer and Consultant
- FromIndia
- Member sinceFeb 2021
Languages
English
Senior .NET Software Consultant with 20+ years of experience helping startups and enterprises build, modernize, troubleshoot and optimize applications. Expert in C#, .NET, ASP.NET Core, Web API, Angular, SQL Server, EF Core, Dapper, ABP and ASP.NET Zero. I specialize in complex debugging, legacy modernization, performance optimization, API integrations and scalable backend solutions. I’ve worked with clients worldwide and delivered long-term projects with 5-star ratings.
My Portfolio
FAQ
What information do I need before starting the project?
Please provide a brief description of your API requirements, existing code or API documentation if available, database details, required integrations, and any specific issues you are facing. If you are unsure about the requirements, contact me first and I can help determine the best approach.
Can I work on an existing ASP.NET Core Web API?
Yes. I can troubleshoot, enhance, refactor, optimize, or add new endpoints to an existing ASP.NET Core Web API. I can work with an existing codebase even when the project was developed by another developer.
Can I develop a new REST API from scratch?
Yes. I can design and develop REST APIs using C#, ASP.NET Core, Entity Framework Core or Dapper, SQL Server, authentication, validation, error handling, and other requirements based on your project.
Can I integrate a third-party API with my application?
Yes. I can integrate external APIs such as payment, CRM, ERP, communication, authentication, shipping, or other third-party services with your .NET application.
Can I fix API errors or performance problems?
Yes. I can investigate API errors, slow response times, database bottlenecks, authentication problems, incorrect results, timeout issues, and other backend problems and work toward identifying and fixing the root cause.
Do I work with SQL Server and Entity Framework Core?
Yes. I have extensive experience with SQL Server, Entity Framework, Entity Framework Core and Dapper, including database integration, query optimization, stored procedures, data access and performance tuning.
Can I implement authentication and authorization?
Yes. I can implement or troubleshoot authentication and authorization using approaches such as JWT and role or policy-based authorization, depending on your application's requirements.
Can I work with my existing architecture and coding standards?
Yes. I prefer to understand the existing architecture, coding conventions and business logic before making changes so that new development fits naturally into your application.
