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I will build a secure aspnet core web API
Yasin Varan
About this gig
Need a secure, scalable ASP.NET Core API or reliable backend integration? I will design, build, fix, or improve your .NET backend using clean architecture and production-ready development practices.
I can help with:
REST API development and third-party integrations
ASP.NET Core endpoint development
JWT authentication and role-based authorization
SQL Server, PostgreSQL, or MySQL integration
Entity Framework Core and database optimization
Validation, exception handling, logging, and security
Swagger and OpenAPI documentation
Unit and integration testing with xUnit
Docker setup and cloud-ready configuration
API debugging, performance tuning, and code modernization
You will receive organized source code, clear communication, and a maintainable solution designed around your requirements. I have more than six years of experience delivering API-first software, distributed systems, financial platforms, cloud applications, and performance-sensitive backend services.
Please contact me before ordering so I can review your requirements, existing codebase, integrations, and expected delivery scope.
Get to know Yasin Varan
Yasin Varan
Senior Software Architect
- FromTurkey
- Member sinceApr 2026
Languages
Turkish, English, German
Senior Software Engineer with 6+ years of experience building scalable cloud, API-driven, and full-stack applications across fintech, SaaS, real estate, and Web3. Skilled in C#/.NET, ASP.NET Core, Python, JavaScript/TypeScript, React, Next.js, AWS, Azure, microservices, REST APIs, and distributed systems. Experienced in performance optimization, database design, CI/CD, security, and AI-powered features using LLMs, RAG, vector search, and intelligent automation.
FAQ
What information do you need before starting?
I need your API requirements, existing source code if applicable, database details, authentication needs, third-party documentation, expected endpoints, and deployment environment.
Can you work with an existing ASP.NET Core project?
Yes. I can review, debug, extend, modernize, or optimize an existing ASP.NET Core API while following its current architecture and coding conventions.
Do you provide authentication and authorization?
Yes. I can implement JWT authentication, OAuth integrations, role-based authorization, permissions, token validation, and secure endpoint access.
Which databases do you support?
I work with SQL Server, PostgreSQL, MySQL, Redis, and Entity Framework Core. I can design schemas, create migrations, optimize queries, and integrate existing databases.
Will you deploy the API?
Deployment is available when included in the agreed scope. I can prepare Docker configuration and assist with deployment to AWS, Azure, or another supported environment.
