About OpenTrain

OpenTrain is the #1 platform for finding and building careers in AI training and data labeling. We hire and contract contributors to do the human work that teaches modern AI systems—helping you start and grow a career shaping how state-of-the-art models behave.

About AI Training Work

AI training (also called data labeling or human feedback) is the human side of building AI. Contributors annotate, review, and evaluate model outputs so models learn to write, test, and reason correctly. These roles are often remote, flexible, and accessible — a great way to apply software skills to cutting-edge AI.

The Role

We’re hiring freelance software developers to act as AI trainers and QA specialists focused on one primary language: Python, JavaScript/TypeScript, Rust, or Ruby. You will review model-generated code, create evaluation prompts, annotate results, and provide structured, actionable feedback to improve code-generation models.

• Commitment: 20+ hours per week (part-time, contractor).
• Pay: $15 USD per hour, paid per agreed contractor arrangement.
• Work is fully remote and open worldwide; OpenTrain AI is the contracting organization.

What You'll Do

Daily tasks center on code quality analysis, bug identification, and instructive feedback designed for model training pipelines. You will follow detailed guidelines and switch between short review tasks quickly, so clarity and consistency matter.

• Review model-generated functions, scripts, and tests for correctness, edge cases, and style.
• Annotate failures, identify bugs, and mark security or logic issues with examples.
• Write and refine evaluation prompts and example inputs to probe model behavior.
• Provide structured written feedback that developers and model trainers can action.
• Follow CI/CD and testing context to assess correctness and reproducibility.

Core Requirements

Candidates must meet the baseline technical and communication requirements below. We will confirm your chosen primary language during screening—please state it clearly when you apply.

• Bachelor’s degree in Computer Science, Software Engineering, or equivalent experience.
• Minimum 3 years of professional development experience in the primary language you select.
• Demonstrated code-review experience and familiarity with CI/CD workflows and testing frameworks.
• Advanced written English for clear, structured feedback.
• Comfortable with rapid task-switching and following complex annotation guidelines.

Language-Specific Qualifications

You will be assigned to one language stream; your application must declare which primary language you are applying for (Python, JavaScript/TypeScript, Rust, or Ruby). The bullets below list required tooling and focus areas for each language.

• Python: Fluency with pytest or unittest; experience automating tests in CI (GitHub Actions, Jenkins); familiarity critiquing AI-generated Python code.
• JavaScript/TypeScript: Hands-on with Jest, Mocha, Cypress, or Playwright; experience with browser automation and bug-tracking workflows.
• Rust: Strong grasp of cargo test, quickcheck/property-based testing, Clippy, rustfmt; experience managing modules/crates and Rust tooling.
• Ruby: Experience with RSpec, Minitest, Capybara and automation pipelines; prior Ruby QA or LLM-assisted QA experience preferred.

Nice-To-Have Signals

These are not required but make your application stand out when relevant to your language stream.

• Previous experience participating in hackathons or competitive coding.
• Prior work on AI training, LLM fine-tuning, or code-evaluation projects.
• Familiarity with tooling that accelerates automated code testing and reproducible CI runs.

Compensation & Logistics

This is a contractor, part-time role paid at an hourly rate. OpenTrain AI contracts contributors directly. Work is remote and open worldwide; applicants are responsible for complying with local tax and contractor requirements.

• Pay type: Hourly contractor rate of $15 USD per hour.
• Hours: 20+ hours per week (flexible scheduling within project guidelines).
• Employment types: Contractor, Part-time. Worldwide applicants accepted.

How To Apply

Apply with a brief summary of your background, your CV or portfolio, and — very important — state which primary language you are applying for: Python, JavaScript/TypeScript, Rust, or Ruby. The screening interviewer will begin by confirming your chosen language and verifying the core qualifications.

• Start your application by answering: “Which primary language are you applying for—Python, JavaScript/TypeScript, Rust, or Ruby?”
• Include examples of code review or links to public repos, tests, or CI configurations if available.
• If you have prior AI training or LLM-related work, describe it briefly to strengthen your application.