You will get .NET API Development | Secure, Scalable & High-Performance REST APIs
Top Rated
Project details
Need a fast, reliable, and secure API for your web, mobile, or SaaS platform? I’ll build a scalable .NET (Core/Framework) REST API with clean architecture, database integration (SQL/NoSQL), authentication, and documentation (Swagger/OpenAPI). Whether you need from-scratch API development or upgrades to legacy endpoints, I ensure high performance, best practices, and long-term maintainability.
Programming Languages
ASP.NETWhat's included
| Service Tiers |
Starter
$150
|
Standard
$300
|
Advanced
$500
|
|---|---|---|---|
| Delivery Time | 3 days | 5 days | 7 days |
Number of Revisions | 0 | 0 | 0 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
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AS
Armando S.
Oct 4, 2025
.NET Developer Needed to Fix Feature Issues on My Website
I had a great experience working with Arslan on fixing feature issues in my .NET website. He quickly understood the problems, communicated clearly, and delivered effective solutions that restored smooth functionality. His technical expertise, professionalism, and timely delivery made the whole process seamless. I’d highly recommend Arslan for any .NET development work and will definitely hire him again in the future.
FH
Faisal H.
Sep 18, 2025
.NET Developer Needed for a Quick Task
I had a great experience working with Arslan. The task was clearly explained, communication was smooth, and all requirements were provided on time. He is professional, cooperative, and easy to work with. I would be happy to collaborate with him again on future .NET projects. Highly recommended client!
WS
Waqas S.
May 7, 2025
React JS Admin Work
Excellent job with react JS dashboard. I recommend working with Arslan for web development needs
RP
Roman P.
Jan 4, 2024
Create Api service on c#
Great work!
HH
Hilal H.
Aug 30, 2022
Add Filter and Pin option to toolbar
Arslan is super helpful will definitely rehire him for future work
About Arslan
Senior .NET Developer | ASP.NET Core, React, Angular, Azure
100%
Job Success
Lahore, Pakistan - 2:18 pm local time
🏆 10+ Years of Experience
🏆 Top Rated Plus Freelancer
🏆 100% Job Success
🏆 40+ Successfully Completed Projects
Expert in full-stack web application development, Azure Bot Framework, Microsoft Teams apps, legacy application modernization, and long-term product support using ASP.NET Core, C#, Blazor, MVC, Web API, React, Angular, and modern cloud technologies.
𝐋𝐨𝐨𝐤𝐢𝐧𝐠 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐭𝐡𝐚𝐧 𝐣𝐮𝐬𝐭 𝐚 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫?
Hi, I'm Arslan Zafar—a Senior Full Stack .NET Developer focused on building secure, scalable, and high-performance applications that solve real business problems. With 8+ years of experience, including work with organizations like TCS, T-Mobile, and CBA, I bridge the gap between complex business requirements and clean, scalable technical solutions.
ASP.NET MVC and legacy modernization
## Tech stack
* C#, .NET, ASP.NET Core, Blazor
* WPF, WinForms
* Entity Framework, LINQ, SQL Server
* DevExpress, Telerik
* REST APIs and backend integrations
Some of my most complex ASP.NET MVC work has been in defence and industrial sectors. I modernized a legacy web platform for a company managing high-uptime naval fleet assets — warships that cannot afford downtime. T. I stabilized the ASP.NET Core back-end, eliminated the performance bottlenecks, and established proper development processes from scratch.
ASP.NET Zero and enterprise acceleration
ASP.NET Zero is my go-to when enterprise clients need multi-tenancy, role-based permissions, and audit logging without spending the first three sprints on boilerplate. I have used it to accelerate delivery on projects in pharma automation, workplace management software, and industrial IoT — cutting setup time significantly and letting the team focus on actual business logic from day one.
🌳 Backend Expertise
🍂 .NET 10, ASP.NET Core, C#
🍂 REST API Development
🍂 Minimal APIs
🍂 Microservices & Distributed Systems
🍂 Clean Architecture
🍂 Entity Framework Core
🍂 Secure Authentication (JWT, OAuth, Identity)
🍂 Role-Based Access Control
🍂 SignalR
🍂 Background Services & Job Processing
🍂 Third-Party API Integration
🌲 Desktop & Mobile Development
🌱 Cross-Platform Desktop Applications
🌱 Windows Desktop Applications
🌱 Mobile Application Backends
🌱 Business Productivity Applications
🌱 Enterprise Desktop Solutions
🖼️ Frontend & Cross-Platform Expertise
🔸 Blazor
🔸 Razor Pag
What I can help you with:
✅ ASP.NET Core, C#, .NET 8, Web API, and backend development
✅ React, Angular, Blazor, TypeScript, and full-stack web applications
✅ SaaS platforms, admin panels, dashboards, and enterprise business systems
✅ Legacy .NET Framework / ASP.NET MVC modernization
✅ SQL Server, EF Core, database design, reporting, and performance tuning
✅ Azure App Services, Azure Functions, Azure Service Bus, Azure SQL, and Key Vault
✅ Microservices, clean architecture, CQRS, background jobs, and distributed systems
✅ API integrations with Xero, QuickBooks, Zoho Books, Stripe, PayPal, Twilio, and third-party platforms
✅ AI integrations using OpenAI, automation workflows, OCR, and intelligent business tools
✅ WinForms, WPF, desktop applications, printer SDKs, RFID, barcode, and hardware integrations
✅ CI/CD pipelines, GitHub Actions, Azure DevOps, Docker, deployment, and production support
Keywords
Senior .NET Developer Upwork
Full-Stack .NET Developer Upwork
ASP.NET Core Developer Upwork
ASP.NET MVC Developer Upwork
C# Developer Upwork
.NET Core Developer Upwork
.NET Backend Developer Upwork
.NET API Developer Upwork
REST API Developer Upwork
Microservices Developer Upwork
Enterprise Application Developer Upwork
SaaS Application Developer Upwork
Cloud Application Developer Upwork
Azure .NET Developer Upwork
SQL Server Developer Upwork
Database Architecture Specialist Upwork
Performance Optimization Specialist Upwork
Software Maintenance & Support Upwork
Application Migration & Upgrade Services Upwork
Third-Party Integration Specialist Upwork
Core Skills
.NET 10, C#, ASP.NET Core, Entity Framework Core, Blazor, Razor Pages, .NET MAUI, Avalonia UI, React, Next.js, JavaScript, TypeScript, SQL Server, PostgreSQL, MySQL, MongoDB, Redis, Azure, AWS, Docker, REST APIs, SignalR, OpenAI, Claude, Gemini, Semantic Kernel, RAG, MCP, AI Agents, AI Automation, WordPress, WooCommerce, Microservices, Clean Architecture, DevOps, CI/CD, Enterprise Software, SaaS Development, Desktop Applications, Mobile Solutions.
ASP.NET Webform, VB.NET, ASP.NET Core, NETMUAI, C#, Blazor, Microservices, Azure, SQL Server, Web API, Angular, Docker, DevOps, Cloud Architecture, SSRS, Enterprise Applications, Legacy application, Stripe Integration, PayPal API, Payment Processing, Third-Party APIs*
Steps for completing your project
After purchasing the project, send requirements so Arslan can start the project.
Delivery time starts when Arslan receives requirements from you.
Arslan works on your project following the steps below.
Revisions may occur after the delivery date.
Requirement Gathering & Architecture Planning
I will review your project requirements, define endpoints, database structure, authentication method, and confirm all technical details before development begins.
API Development & Testing
I will build secure and scalable .NET APIs with proper documentation (Swagger/OpenAPI), implement business logic, database integration, and test all endpoints thoroughly.