C# Developer — AI Training & Code Annotation

About OpenTrain

OpenTrain is the #1 platform for finding and building careers in AI training and data labeling. We connect contributors with real projects that shape how state-of-the-art AI systems behave.

For this role, OpenTrain AI is the hiring and contracting organization; you'll contract directly with us to contribute code and annotations that train and evaluate models.

About AI training work

AI training (also called data labeling or human feedback work) is the human side of building AI: people prepare, review, and correct examples that models learn from. Tasks range from annotating images and transcribing audio to writing and reviewing model-generated code.

This work is highly flexible and remote-friendly—many contributors set their own schedules and balance labeling with other commitments while doing impactful, cutting-edge work.

The role

We’re hiring experienced C# developers to create and curate training data for AI systems. Your primary responsibilities are writing code snippets and short programs from prompts, debugging and correcting AI-generated C# code, and refining examples so models learn correct patterns.

This is a long-term project (6+ months) with a 20–40 hour/week commitment and a flexible schedule. Work is 100% remote and open to contributors worldwide.

What you'll do

Daily tasks focus on producing accurate, well-documented C# examples and reviewing AI outputs for correctness, style, and requirements.

• Write short C# programs and code snippets based on provided prompts and specifications.
• Debug and correct AI-generated C# code to meet functional and stylistic requirements.
• Optimize and refactor code examples for clarity, performance, and best practices.
• Flag ambiguous or incorrect prompts and provide suggested fixes to improve dataset quality.
• Document test cases or expected behavior for code examples when requested.

Requirements

Candidates must meet the stated academic and professional experience requirements and be able to maintain a reliable remote work setup.

• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field.
• At least 2 years of professional software development experience with a strong focus on C#.
• Proven ability to develop, troubleshoot, and optimize C# code.
• Effective communication skills in English and ability to collaborate remotely.
• Stable internet connection and reliable electricity to ensure consistent remote work.
• Ability to commit 20–40 hours per week for a duration of 6 months or more.
• After you apply you will receive a C# coding assessment to verify skills; applicants with under 2 years of C# experience may receive lower proposal scores.

Who should apply

This role is a great fit for C# developers who enjoy writing clear, maintainable code and who want flexible remote work that directly affects how AI systems learn to program.

Apply if you have solid C# experience, enjoy debugging model outputs, and want steady part-time contract work for a multi-month project.

Compensation, logistics & next steps

Pay: $9 USD per hour, paid on a contractor basis. Employment type: part-time contractor for a long-term engagement (6+ months).

How to apply: submit your proposal through the platform; after submission you will be sent a C# coding assessment. Successful completion of the assessment is required to begin work.