C# Developer, .NET – Freelancer

Vexcash

. Develop clean, maintainable, testable, and reusable C# code based on business requirements and user stories .

Posted 11/6/2026contractRemoteMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in developing clean, maintainable C# code and backend applications using .NET 8+, ASP.NET Core, and Entity Framework Core. Proficient in designing RESTful APIs, optimizing SQL Server performance, and implementing automated testing frameworks within agile environments.

Highest-signal resume keywords

C# ProgrammingASP.NET Core DevelopmentEntity Framework CoreSQL Server OptimizationRESTful API Design

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

C# ProgrammingASP.NET CoreEntity Framework CoreADO.NETSQL ServerRESTful API DesignAutomated TestingCI/CD PipelinesCloud-Based ArchitecturesSoftware Architecture Principles

Soft Skills

Analytical SkillsProblem-Solving SkillsCollaboration

Tools & Technologies

GitMicrosoft AzureXUnitNUnitMSTest

Industry Keywords

Agile DevelopmentClean Code PracticesDesign PatternsPerformance TuningData Modelling

Tech Stack

Tools & technologies

ASP.NETAzureCloudEntity FrameworkSQL.NET

About the role

Key responsibilities & impact

Develop clean, maintainable, testable, and reusable C# code based on business requirements and user stories
Design, develop, and maintain backend applications and services using .NET 8+, ASP.NET Core, and Entity Framework Core
Design and implement RESTful APIs following best practices and scalable architecture principles
Work with SQL Server, including data modelling, query optimization, and performance tuning
Work with Entity Framework Core and ADO.NET for efficient data access and persistence
Implement automated unit and integration tests to ensure software quality and reliability
Apply software architecture principles, design patterns, and clean code practices
Collaborate using Git-based workflows and participate in code reviews
Contribute to CI/CD pipelines and automated deployments
Work with Microsoft Azure services and cloud-based architectures
Analyze, troubleshoot, and resolve technical, functional, and performance issues
Contribute to the continuous improvement of code quality, architecture, scalability, and development processes

Requirements

What you’ll need

Strong professional experience with C# and the .NET ecosystem
Hands-on experience with .NET Framework, including maintenance and enhancement of legacy applications
Strong experience with .NET 8+ and ASP.NET Core for modern backend development
Solid experience with Entity Framework Core and ADO.NET
Proven experience designing and building RESTful APIs
Strong knowledge of SQL Server, relational database design, and query optimization
Good understanding of software architecture principles, design patterns, and clean code
Experience with automated testing frameworks such as xUnit, NUnit, or MSTest
Experience using Git in collaborative development environments
Familiarity with CI/CD pipelines and automated deployment processes
Experience with Microsoft Azure and cloud-based application architectures
Experience working in agile development environments
Strong analytical and problem-solving skills with a strong focus on code quality
Good command of English; German is a plus

Benefits

Comp & perks

12-month contract
40 hours/week
Freelancer / independent contractor arrangement
Remote worldwide work arrangement