You will get Rest API Integration Service with OAuth, API Developer for API Development

Nelson Y.Status: Offline
Nelson Y.

Let a pro handle the details

Buy Web Application Programming services from Nelson, priced and ready to go.
Nelson Y.Status: Offline
Nelson Y.

Let a pro handle the details

Buy Web Application Programming services from Nelson, priced and ready to go.

Project details

Develop and Integrate Custom REST API with OAuth Authentication in .NET

Are you in need of a secure, scalable, and high-performing REST API for your project? Look no further! With extensive expertise in REST API Integration, API Development, and third-party API integration, I specialize in delivering custom, robust APIs tailored to your specific needs using the power of ASP.NET Core.
Whether you need to build a new API from scratch, integrate third-party services, or ensure your API follows industry-best security practices like OAuth 2.0, I’m here to help your project thrive.

My Services Include:
Custom REST API development with JSON or XML response
Secure authentication using OAuth 2.0 or API keys
Third-party REST API Integration (Stripe, Google Maps, etc.)
CRUD operations and custom API routes
Database connections (MySQL, MSSQL, MongoDB, or PostgreSQL)
Comprehensive API Testing with Postman or Swagger
API versioning for future-proof solutions
Structured error handling for a smooth user experience

Why Choose Me Over the Competition?
Extensive Experience
Security First
Scalable APIs
Programming Languages
HTML & CSS, ASP.NET, C#
What's included
Service Tiers Starter
$50
Standard
$150
Advanced
$300
Delivery Time 3 days 7 days 14 days
Number of Revisions
133
Number of Pages
135
Design Customization
-
-
Content Upload
-
Responsive Design
-
Source Code

Frequently asked questions

Nelson Y.Status: Offline

About Nelson

Nelson Y.Status: Offline
Expert .NET Developer | Tech Lead with 10+ Years of Experience
Karachi, Pakistan - 6:15 pm local time
My name is Nelson Younus and I am a Freelancer on UpWork, specializing in Web Application Development (ASP.NET Core), Back-End Application Development (ASP.NET, C#), SQL Server DBA, and Full Stack .NET Development.
𝗳𝗼𝗿𝗺𝗮𝘁
✅ 10+ years as Full Stack .NET Developer and Back End Developer
✅ I have architect the .NET Core Applications (Both Web APIs and Razor Pages)
✅ An excellent problem- solver, able to quickly grasp complex systems and identify opportunities for
improvements and resolution of critical issues.
✅ Experience in database designing/normalization (SQL Server DBA)
✅ System analysis, Analysis and Design, Database Modeling, Technical Documentation and
Architecture training Tutorials.
✅ Experience in developing web- based applications using C#, .Net Framework, ASP.NET, ADO.Net, Web
services, Windows services, WCF, and Microsoft SQL Server.
✅ Experience in Front- End development using HTML5 / DHTML, jQuery, CSS3.
✅ Hands on experience on .NET Framework, ASP.NET Core, Entity Framework, Entity Framework Core, ASP.NET, C#, Visual Studio 2008- 2022, IIS.

✅ Usage of Xamarin. Forms with MVVM architecture that connected to web service.
✅ Third-Party integrations.
✅ Strong Object-Oriented concepts for software design and implementation.
✅ Strong communication, interpersonal, and time management skills with good work ethics.

CORE STRENGTHS AND ENABLING SKILLS

✅ Azure
✅ .NET Framework
✅ C#
✅ ASP.NET, VB.Net
✅ ASP.NET MVC
✅ .NET Core
✅ SQL Server (SQL Server DBA)
✅ Entity Framework
✅ Entity Framework Core
✅ ADO.NET
✅ WPF C#


✅ JavaScript
✅ Bootstrap
✅ React JS
✅ jQuery
✅ Ajax
✅ HTML5, CSS3

✅ Web Services,
✅ REST API (RESTful API)

✅ Xamarin.Forms
✅ SSRS

✅ Test Driven Development
✅ Domain Driven Development

✅ MySQL
✅ IIS
✅ Selenium Automation Testing
✅ SendGrid, Zapier, Twilio

🚀 Let’s build something powerful together.
I bring deep technical expertise, clean coding standards, and a commitment to delivering top-quality solutions tailored to your business needs.

📩 Click “Invite to Job” and let’s get started.

Steps for completing your project

After purchasing the project, send requirements so Nelson can start the project.

Delivery time starts when Nelson receives requirements from you.

Nelson works on your project following the steps below.

Revisions may occur after the delivery date.

API documentation and testing support

I will provide Postman collection or Swagger UI documentation and assist in testing the API endpoints.

Minor revisions and post-delivery support

I offer up to 2 rounds of revisions and 7 days of support after delivery to ensure smooth integration.

Review the work, release payment, and leave feedback to Nelson.