You will get an enterprise-grade .NET Core Web API for your mobile or web app
Project details
Your Flutter or React app is only as good as its engine. You need a backend that is fast, secure, and won't crash under pressure.
I build enterprise-grade, high-performance REST APIs using .NET Core (C#) designed to power your most demanding mobile and web applications. This isn't just a basic backend; it's a scalable, secure foundation built for growth.
**Why this package?**
As a full-stack consultant (I also build Flutter & React apps), I build your API with the 'big picture' in mind. I know *exactly* how your frontend will consume these endpoints. My focus is on clean architecture, robust security (JWT), and high performance.
**My Process:**
1. **Discovery & Database Design:** We define your data models and architect the database (e.g., SQL Server, PostgreSQL).
2. **Endpoint Development:** I build your API endpoints with clean C# code, business logic, and data validation.
3. **Security Implementation:** I secure your API using industry-standard JWT (token) authentication.
4. **Delivery:** You get the fully tested, well-documented source code ready for deployment.
Stop worrying about your backend. Let's build a secure and scalable foundation for your app.
I build enterprise-grade, high-performance REST APIs using .NET Core (C#) designed to power your most demanding mobile and web applications. This isn't just a basic backend; it's a scalable, secure foundation built for growth.
**Why this package?**
As a full-stack consultant (I also build Flutter & React apps), I build your API with the 'big picture' in mind. I know *exactly* how your frontend will consume these endpoints. My focus is on clean architecture, robust security (JWT), and high performance.
**My Process:**
1. **Discovery & Database Design:** We define your data models and architect the database (e.g., SQL Server, PostgreSQL).
2. **Endpoint Development:** I build your API endpoints with clean C# code, business logic, and data validation.
3. **Security Implementation:** I secure your API using industry-standard JWT (token) authentication.
4. **Delivery:** You get the fully tested, well-documented source code ready for deployment.
Stop worrying about your backend. Let's build a secure and scalable foundation for your app.
Programming Languages
ASP.NET, C#Coding Expertise
Performance Optimization, Security, DesignWhat's included
| Service Tiers |
Starter
$1,500
|
Standard
$2,500
|
Advanced
$4,500
|
|---|---|---|---|
| Delivery Time | 7 days | 14 days | 21 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 2 | 5 | 10 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$450 - $1,500
Additional Revision
+$300
Additional API Endpoint
(+ 2 Days)
+$400
API Deployment
(+ 2 Days)
+$500Frequently asked questions
About Hakan Berk
End-to-End Developer | Web, API & Mobile (Flutter/Kotlin)
Istanbul, Turkey - 11:28 am local time
Tired of managing multiple freelancers (a backend dev, a frontend dev, and a mobile dev) just to bring your idea to life?
I am your end-to-end software development partner—a single point of contact who can architect, build, and launch your entire project. I don't just write code; I understand your vision, build the right architecture, and turn it into a scalable product that works seamlessly across both web and mobile.
Why work with me?
Because I see the full picture. When I build an API on the backend, I already know exactly how it will perform in the mobile app and how it will impact the user experience on the web interface. This unified approach saves you time, money, and the headache of communication chaos.
My Areas of Expertise:
📱 Mobile Development (Core Focus):
Flutter: Fast, efficient, and beautiful applications for both iOS & Android from a single codebase.
Kotlin (Native Android): High-performance, platform-specific Android apps that leverage the full power of the device.
⚙️ Backend Development:
Secure, fast, and scalable RESTful APIs and microservice architectures.
Database design (SQL/NoSQL) and optimization.
.NET (ASP.NET Core), C#
💻 Frontend Development:
Modern, responsive, and user-friendly web interfaces.
React.js, Next.js
How I Can Help You:
MVP Development: A fully functional first version or prototype for your startup, built for rapid market entry.
Full Product Development: Taking your idea from zero to launch—from the cloud server all the way to the App Store & Play Store.
Technical Consulting: Auditing your existing systems, identifying bottlenecks, and modernizing your tech stack.
If you need a reliable technical expert to ensure your project works flawlessly across all platforms, send me an invitation for a free 15-minute discovery call.
Let's turn your vision into reality.
Steps for completing your project
After purchasing the project, send requirements so Hakan Berk can start the project.
Delivery time starts when Hakan Berk receives requirements from you.
Hakan Berk works on your project following the steps below.
Revisions may occur after the delivery date.
Discovery & Database Design
We'll have a kickoff call to confirm your API requirements. Based on this, I will design the database schema and project architecture.
Endpoint Development & Logic
I will build the 5 API endpoints (e.g., GET, POST, PUT) using clean .NET Core code. This includes implementing all business logic and data validation.