C# Developer — AI Training (Remote, 20–40 hrs/wk)

About OpenTrain

OpenTrain is the #1 platform for finding and building careers in AI training and data labeling. We help people start and grow careers teaching AI by connecting contributors with real projects where they create the examples and reviews that modern models learn from.

Why AI training work matters

AI training (data labeling/annotation) is the human side of building intelligent systems. Tasks range from writing and rating model responses to annotating code, and contributors directly shape how state-of-the-art AI behaves.

This kind of work is highly flexible and remote-friendly — great for part-time schedules — and often requires only your language skills, attention to detail, or domain expertise. Specialist projects, like coding-focused work, pay for technical experience and influence model behavior in developer-facing tools.

The role

We are looking for experienced C# developers to join a long-term AI training project. You will write short C# code snippets and small programs from prompts, debug and improve AI-generated C# code, and produce accurate labeled examples used to train and evaluate models.

This is a contractor, part-time role for 6+ months with a flexible schedule. You set your hours but should be available for a weekly commitment of 20–40 hours. Work is 100% remote.

• Employment type: Contractor, Part-time
• Duration: 6+ months (ongoing project)
• Time commitment: 20–40 hours per week
• Pay: $9 USD per hour

What you'll do

Your day-to-day work will focus on creating high-quality coding examples and corrections that teach models to generate and repair C# code correctly.

• Write C# code snippets and short programs from provided prompts and specifications.
• Debug, refactor, and optimize AI-generated C# code to meet requirements.
• Label and document correct vs. incorrect code and explanations to form training datasets.
• Follow project guidelines and QA checks to ensure consistency and accuracy.
• Use the project's web-based/proprietary labeling tools (OTHER) to submit work and feedback.

Requirements

You must meet every substantive requirement below to be considered for this role. We will send a C# coding assessment after you submit your proposal.

• 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 in real-world projects.
• Effective English communication skills for written instructions and code comments.
• Reliable remote work setup with stable internet connection and consistent power.
• Availability to commit 20–40 hours per week for at least 6 months.
• If you do not have more than 2 years of real-world C# experience, your proposal will score below 7.

Who should apply

This role is a great fit for software developers who enjoy coding challenges, clear specifications, and helping AI learn from correct examples. If you have solid C# experience and want flexible remote contract work that directly influences AI models, apply.

• Developers with 2+ years in C# looking for a part-time remote contract.
• People who are comfortable reading, writing, and improving others' code.
• Candidates who prefer flexible schedules and steady weekly hours.

How the process works

Apply by submitting your proposal. After submission you'll receive a C# coding assessment to complete — successful completion is required to join the project. Once onboarded, you'll use the project's labeling tools, follow the task guidelines, and submit work for review.

• Submit a proposal describing your C# experience.
• Complete the C# coding assessment sent after application.
• If approved, begin the onboarding and start contributing on a 20–40 hr/wk schedule.