You will get a Secure ASP.NET Core REST API — Web API, SQL & Swagger
Rising Talent
Rising Talent
Project details
Need a secure, well-built REST API your team can actually rely on? I design and build production-grade REST APIs in ASP.NET Core (C#) — clean endpoints, proper authentication, a solid database, and clear Swagger docs.
I'm a senior .NET backend engineer (5+ years) who has built and hardened APIs across property tech, ecommerce, and field-operations apps — including offline-sync APIs that stay reliable under bad connectivity. You work directly with me, the engineer writing your code. No agencies, no juniors.
What you can get:
✔ ASP.NET Core Web API with clean, RESTful endpoints
✔ JWT / OAuth authentication & role-based access
✔ SQL Server + Entity Framework Core
✔ Validation, error handling & Swagger/OpenAPI docs
✔ Third-party integrations & deployment-ready code
Pick a tier: API Starter (small API), Production API (auth + full CRUD), or Scalable API (integrations, tests & CI/CD).
Tell me what your API needs to do, and I'll reply with a clear plan before you order.
I'm a senior .NET backend engineer (5+ years) who has built and hardened APIs across property tech, ecommerce, and field-operations apps — including offline-sync APIs that stay reliable under bad connectivity. You work directly with me, the engineer writing your code. No agencies, no juniors.
What you can get:
✔ ASP.NET Core Web API with clean, RESTful endpoints
✔ JWT / OAuth authentication & role-based access
✔ SQL Server + Entity Framework Core
✔ Validation, error handling & Swagger/OpenAPI docs
✔ Third-party integrations & deployment-ready code
Pick a tier: API Starter (small API), Production API (auth + full CRUD), or Scalable API (integrations, tests & CI/CD).
Tell me what your API needs to do, and I'll reply with a clear plan before you order.
Programming Languages
ASP.NET, C#Coding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$120
|
Standard
$500
|
Advanced
$1,300
|
|---|---|---|---|
| Delivery Time | 3 days | 9 days | 18 days |
Number of Revisions | 1 | 2 | 9 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Third Party Integration
(+ 2 Days)
+$150
Unit tests
(+ 2 Days)
+$100
Deploy
(+ 2 Days)
+$150Frequently asked questions
About Md. Ashraful
Senior .NET Backend Developer | ASP.NET Core, APIs & AI Integration
Dhaka, Bangladesh - 4:01 am local time
𝗦𝗲𝗻𝗶𝗼𝗿 .𝗡𝗘𝗧 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿 | ASP.NET Core | REST APIs | AI Integration
If your ASP.NET Core application is slow, difficult to scale, or constantly breaking in production, I can help.
I'm a Senior .NET Backend Engineer with 6+ years of experience building production-ready backend systems for SaaS, Property Technology, Ecommerce, Payments, and Enterprise Applications.
Unlike many freelancers, I don't just build features—I take ownership of the complete backend, from architecture and API design to deployment, optimization, and production support.
⭐ 𝗣𝗿𝗼𝗯𝗹𝗲𝗺𝘀 𝗜 𝗦𝗼𝗹𝘃𝗲
✅ Slow ASP.NET Core applications
✅ Poor SQL Server performance
✅ Buggy legacy .NET applications
✅ Payment gateway integration issues
✅ Production bugs and server crashes
✅ Linux deployment & DevOps challenges
✅ AI integration into existing .NET applications
✅ Legacy PHP / CodeIgniter systems that need modernization
⭐ 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀
✅ ASP.NET Core & C# Backend Development
✅ REST API Design & Development
✅ Enterprise Backend Architecture
✅ SQL Server Database Design
✅ Entity Framework & ABP Framework
✅ Third-Party API Integration
✅ Authentication & Authorization
✅ WebSockets & Real-Time Applications
✅ AI Integration (OpenAI, LLMs & RAG)
✅ ChromaDB & Vector Database Integration
✅ Performance Optimization
✅ Bug Fixing & Production Troubleshooting
✅ Legacy .NET Application Modernization
✅ Docker, Nginx & CI/CD
✅ Ubuntu/Linux Server Deployment
✅ GitHub Actions Automation
⭐ 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀
𝗕𝗮𝗰𝗸𝗲𝗻𝗱
✅ C#
✅ ASP.NET Core
✅ ASP.NET MVC
✅ Web API
✅ Entity Framework
✅ ABP Framework
✅ REST APIs
✅ WebSockets
𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲
✅ Microsoft SQL Server
✅ Database Design
✅ Query Optimization
✅ Stored Procedures
𝗔𝗜 & 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻
✅ OpenAI API
✅ LLM Integration
✅ Retrieval-Augmented Generation (RAG)
✅ ChromaDB
✅ AI Workflow Automation
𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱
✅ JavaScript (ES6+)
✅ jQuery
✅ HTML5
✅ CSS3
✅ Bootstrap
✅ Razor Views
✅ Basic Angular
𝗢𝘁𝗵𝗲𝗿 𝗕𝗮𝗰𝗸𝗲𝗻𝗱
✅ PHP
✅ CodeIgniter
✅ Laravel
✅ Node.js
✅ npm
𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀
✅ Xero
✅ Google Maps API
✅ Google Calendar API
✅ IBM Watson
✅ Payment Gateways
✅ Third-Party APIs
𝗗𝗲𝘃𝗢𝗽𝘀
✅ Ubuntu/Linux
✅ Docker
✅ Nginx
✅ GitHub Actions
✅ CI/CD
⭐ 𝗥𝗲𝗰𝗲𝗻𝘁 𝗣𝗿𝗼𝗷𝗲𝗰𝘁𝘀
🏢 Property Valuation SaaS (Australia)
✔ ASP.NET Core + ABP Framework
✔ 23+ Active Tenants
✔ Real-time Valuation Workflows
✔ Xero & Third-Party Integrations
✔ Production Deployment & Maintenance
🛒 Enterprise Ecommerce Platform
✔ Handles 7,000+ Daily Logins
✔ High-Performance Backend
✔ Ubuntu VPS Deployment
📱 Offline Field Data Collection System
✔ ASP.NET Web API
✔ Offline-First Synchronization
✔ Mobile API Integration
🅿️ Parking Reservation Platform
✔ End-to-End Backend Development
✔ Booking & Payment Workflows
✔ Production Deployment
📦 Open Source NPM Package
✔ Published & Maintained Package Used by Developers
⭐ 𝗔𝗹𝘀𝗼 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲𝗱 𝗪𝗶𝘁𝗵
✅ CodeIgniter
✅ Laravel
✅ JavaScript & jQuery
✅ Angular
✅ Razor Pages
✅ HTML5 & CSS3
✅ Node.js
✅ PHP Applications
⭐ 𝗔𝗜 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀
Looking to add AI to your existing .NET application?
I can build:
✅ AI Chatbots
✅ OpenAI Integration
✅ RAG Applications
✅ AI Workflow Automation
✅ Semantic Search
✅ Knowledge Base Assistants
⭐ 𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗛𝗶𝗿𝗲 𝗠𝗲
✅ Production-Ready Code
✅ Clean & Maintainable Architecture
✅ Performance-Focused Development
✅ Fast & Clear Communication
✅ Honest Timelines
✅ Long-Term Support
✅ Direct Communication with the Engineer Building Your Project
⭐ 𝗜'𝗺 𝗔 𝗚𝗿𝗲𝗮𝘁 𝗙𝗶𝘁 𝗜𝗳 𝗬𝗼𝘂 𝗡𝗲𝗲𝗱
✅ A New ASP.NET Core Application
✅ REST API Development
✅ SQL Server Optimization
✅ Third-Party API Integration
✅ AI Features
✅ Production Bug Fixes
✅ Performance Improvements
✅ Azure/Linux Deployment
✅ Legacy .NET Modernization
⭐ 𝗛𝗼𝘄 𝗜 𝗪𝗼𝗿𝗸
✅ Understand Your Business Requirements
✅ Review Existing Architecture
✅ Build Scalable & Maintainable Code
✅ Thorough Testing Before Delivery
✅ Safe Production Deployment
✅ Post-Launch Support
⭐ 𝗔𝘃𝗮𝗶𝗹𝗮𝗯𝗶𝗹𝗶𝘁𝘆
✔ Hourly & Fixed Price Projects
✔ Long-Term Contracts
✔ Startup MVP Development
✔ Enterprise Applications
✔ Flexible Overlap with US, UK, EU & Australian Business Hours
⭐ 𝗙𝗿𝗲𝗲 𝟯𝟬-𝗠𝗶𝗻𝘂𝘁𝗲 𝗖𝗼𝗻𝘀𝘂𝗹𝘁𝗮𝘁𝗶𝗼𝗻
Every project is different. Before you hire, I'm happy to discuss your requirements, review your existing system, identify challenges, and recommend the best technical approach. Even if we don't end up working together, you'll leave with a clearer direction for your project.
Send me a message with a brief overview of your project, and let's build something reliable.
Steps for completing your project
After purchasing the project, send requirements so Md. Ashraful can start the project.
Delivery time starts when Md. Ashraful receives requirements from you.
Md. Ashraful works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements & API Design
We confirm the endpoints, data model, and auth needs, and I share a short plan before building.
Data Model & Authentication
I set up the SQL Server schema with EF Core and implement secure authentication (JWT/OAuth).