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C# Engineer - AI Training

Braintrust

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Contract Type:
Not provided

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Salary:

20.00 - 70.00 USD / Hour

Job 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.

Job Responsibility:

  • Review AI-generated C# code, .NET application designs, and technical explanations
  • Generate high-quality reference implementations and step-by-step reasoning for complex engineering problems
  • 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
  • Rate and compare multiple AI responses based on correctness and reasoning quality

Requirements:

  • 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)

Nice to have:

  • 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
What we offer:
  • No talent fees or membership costs so freelancers keep 100% of what they earn
  • Get rewarded with BTRST, Braintrust's cryptotoken, for inviting talent, taking a class—even signing up

Additional Information:

Job Posted:
February 04, 2026

Employment Type:
Parttime
Work Type:
Remote work
Job Link Share:

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