C# Engineer - AI Training (Part Time, Freelance, Remote, 20+ openings)

Compensation

Compensation is competitive and varies based on location, education level, and prior

experience.

Role Description

As a Senior C# Engineer, you will work remotely on an hourly paid basis to review AI-generated C# code, .NET application designs, and technical explanations, as well as generate high-quality reference implementations and step-by-step reasoning for complex engineering problems. You will assess solutions for accuracy, clarity, safety, and adherence to the prompt; identify errors in logic, memory usage, concurrency, threading, or performance; fact-check technical information; write high-quality explanations and model solutions that demonstrate correct methods; and rate and compare multiple AI responses based on correctness and reasoning quality.

This fully remote, hourly paid contractor role is with SME Careers, a fast-growing AI data services company and subsidiary of SuperAnnotate that provides AI training data to many of the world’s largest AI companies and foundation model labs. Your C# and .NET expertise will directly help improve the world’s premier AI models used by millions of developers worldwide.

Your Profile

Bachelor’s degree or higher in Computer Science, Software Engineering, or a closely related technical field.4+ years of professional experience developing production software in C#, including backend services, APIs, or desktop/server-side applications.Expert-level proficiency in C# and the .NET ecosystem, including strong understanding of memory management, garbage collection, async/await, threading, and exception handling.Strong background in software engineering and systems concepts, including concurrency, multithreading, performance optimization, and application architecture.Hands-on experience with .NET tooling, including Visual Studio or Rider, build systems (MSBuild, dotnet CLI), debuggers, and profilers.Minimum C1 English proficiency (written and spoken), with the ability to write clear technical explanations and follow detailed English-language guidelines.Proven experience conducting detailed code reviews and enforcing coding standards, best practices, and maintainability in C# codebases.Comfort working with version control systems, CI/CD workflows, and automated testing frameworks (e.g., xUnit, NUnit, MSTest).Previous experience with AI data training, annotation, or evaluating AI-generated technical content is a strong plus.Highly detail-oriented and systematic, with a methodical approach to evaluating reasoning quality and identifying subtle issues in complex C# code. #LI-Remote