You will get .NET Core Web API backend or C# script
Top Rated
Top Rated
Project details
Stop struggling with messy backend code. Get a professional, scalable .NET API built correctly the first time.
You don't need a generalist developer guessing their way through your project. You need a dedicated .NET expert. I specialize in building robust ASP.NET Core Web APIs and C# automation scripts that are secure, fast, and easy to maintain.
Whether you need to connect your frontend to a database, automate a CSV processing task, or build a secure authentication system, I deliver standardized, clean code ready for production.
WHAT YOU GET:
Production-Ready Code: Built on the latest .NET standards (6/7/8).
Database Integration: Seamless connection to SQL Server, PostgreSQL, or MySQL.
Full Documentation: Auto-generated Swagger UI so your team knows exactly how to use the endpoints.
Clean Architecture: Code that is easy to read, test, and extend in the future.
WHAT IS NOT INCLUDED:
Frontend UI development (React/Angular/Vue).
Cloud hosting setup (Azure/AWS deployment is a separate conversation).
My Guarantee: I don't just write code that "works on my machine." I deliver a backend solution that works for your business.
You don't need a generalist developer guessing their way through your project. You need a dedicated .NET expert. I specialize in building robust ASP.NET Core Web APIs and C# automation scripts that are secure, fast, and easy to maintain.
Whether you need to connect your frontend to a database, automate a CSV processing task, or build a secure authentication system, I deliver standardized, clean code ready for production.
WHAT YOU GET:
Production-Ready Code: Built on the latest .NET standards (6/7/8).
Database Integration: Seamless connection to SQL Server, PostgreSQL, or MySQL.
Full Documentation: Auto-generated Swagger UI so your team knows exactly how to use the endpoints.
Clean Architecture: Code that is easy to read, test, and extend in the future.
WHAT IS NOT INCLUDED:
Frontend UI development (React/Angular/Vue).
Cloud hosting setup (Azure/AWS deployment is a separate conversation).
My Guarantee: I don't just write code that "works on my machine." I deliver a backend solution that works for your business.
Programming Languages
JavaScript, ASP.NET, C#Coding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$100
|
Standard
$249
|
Advanced
$495
|
|---|---|---|---|
| Delivery Time | 2 days | 5 days | 10 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 1 | 3 | 6 |
Design Customization | - | ||
Content Upload | - | - | |
Responsive Design | - | - | - |
Source Code |
Frequently asked questions
8 reviews
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OE
Olga E.
Jan 8, 2026
OE
Olga E.
Jan 12, 2026
30 minute consultation
OE
Olga E.
Jan 8, 2026
You will get .NET Core Web API backend or C# script
OE
Olga E.
Jan 5, 2026
Full Stack .NET Core Web Application with Secure API Development and SQL Integration
Alexander was easy to work with and very attentive to details. He understood the task quickly and handled everything with care and consistency
OE
Olga E.
Dec 29, 2025
Short Full Stack .NET Task with API and Front-End Updates
Good work and great communication
OE
Olga E.
Dec 7, 2025
Full Stack .NET and Web3 Developer for Smart Contract Web App (C#, ASP.NET, Solidity, Ethereum)
About Alexander
Python Machine Learning | C# .NET | Data Analytics | SQL
100%
Job Success
Gijon, Spain - 4:31 am local time
• Scaled cloud infrastructure on Microsoft Azure and AWS to handle 1M+ requests/day using Kubernetes.
• Engineered a high-frequency trading module using C++ that improved data processing speed by 30%.
• Designed interactive Dashboard reporting using Microsoft Power BI and Looker Studio to visualize complex datasets.
• Developed a cross-platform Smartphone application integrated with a custom AI Chatbot for 24/7 customer support.
• Delivered over $100k in value on Upwork with a 100% Job Success score across 2,500+ hours.
• Architected a Natural Language Processing (NLP) and AI Agent Development workflow to automate Data Extraction from unstructured text.
• Built a Deep Learning model for predictive Data Science analytics, resulting in a 15% increase in user retention.
• Implemented a robust ETL Pipeline to migrate legacy data from Microsoft Excel to secure SQL databases.
My technical toolkit is comprehensive, spanning Full Stack Development with ASP .NET Core, Angular, and React, to specialized Data Engineering. I possess expert-level proficiency in SQL, Data Scraping, and Data Annotation workflows. Whether you need a Web Application, API Integration, or a complex AI Development project involving Deep Learning, I ensure seamless execution. I am equally comfortable managing Front-End Development with HTML5, jQuery, and TypeScript as I am handling Back-End Development and Data Visualization. Let's schedule a consultation to discuss how we can elevate your technical infrastructure and Data Analytics strategy.
Steps for completing your project
After purchasing the project, send requirements so Alexander can start the project.
Delivery time starts when Alexander receives requirements from you.
Alexander works on your project following the steps below.
Revisions may occur after the delivery date.
Requirement & Database Design
I review your requirements and design the database schema (SQL tables) or JSON structure to ensure data integrity before writing code.
Core Development & Implementation
I write the C# logic and build your API endpoints using .NET Best Practices (Dependency Injection, Async/Await) to ensure performance.