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Fiverr Pro
English
$
USD
I will develop custom rest apis and third party integrations in c sharp dot net
Benjamin Varjas
About this gig
Need to connect your application with external services, or build a secure, high-performance API from scratch?
I am an IT engineer specializing in building custom REST APIs and robust third-party system integrations using C# and ASP.NET Core. Whether you need to handle secure data exchanges, manage webhooks, or implement full OAuth authentication flows, I've got you covered.
What I can build for you:
- Custom RESTful APIs using ASP.NET Core Web API
- Third-party platform integrations (Google Classroom, Moodle/LTI, CRM, Payment Gateways)
- Secure Webhook receivers with JSON/XML payload parsing and data remapping
- OAuth 2.0 / OpenID Connect Single Sign-On (SSO) authentication
- Database integration using Entity Framework Core
What you will get: Clean, maintainable, asynchronous C# code that follows industry-standard security practices and architecture patterns, along with crisp documentation for system admins.
Please contact me before placing an order so we can review the API documentation and requirements together!
Get to know Benjamin Varjas
Benjamin Varjas
I will develop custom C sharp console applications and backend algorithms
- FromHungary
- Member sinceJun 2026
Languages
Hungarian, English
Need a robust solution for your C# backend? I am an IT Engineering student specializing in efficient console applications and optimizing complex algorithms.
I focus on writing clean, modular, and well-documented C# code using strict OOP principles and modern .NET Core features.
What I offer:
- Custom C# Console Applications
- Algorithm Optimization & Data Structuring
- Bug Fixing and Performance Tuning
- File I/O, Data Parsing, and Automation Scripts
I ensure quick delivery, clean architecture, and clear communication. Let's discuss your project!
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FAQ
What information do you need to start the integration?
will need the official API documentation or SDK of the third-party platforms you want to integrate, along with a clear description of the data flow (e.g., what should happen when a webhook triggers).
Do you handle authentication like OAuth 2.0 or API Keys?
Yes, absolutely. I implement industry-standard secure authentication methods, including OAuth 2.0 client credentials, code authorization flows, and API key validations.
Will I receive documentation for the API?
es. For the Standard and Premium packages, I provide clear setup instructions, field mappings, and configuration steps for your system administrators.
