Swift/iOS Code Reviewer for AI Training

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 skilled contributors with projects across the industry.

This role is posted through the OpenTrain platform as part of a broader effort to improve how AI systems learn from human-written code and feedback.

About AI training and why it matters

AI training (also called data labeling or human feedback) is the human side of building intelligent systems: people create, review, and score examples that shape model behavior. Engineers and reviewers working on these projects directly influence how models understand and generate code and technical output.

Work in this field is often remote and flexible, and it can be a rewarding way to apply domain expertise (here: Swift/iOS) to improve the quality and safety of real-world AI systems.

The role

We are seeking experienced Swift/iOS developers to perform quality assurance and code review for AI model training. As a Swift QA - AI Data Trainer you will evaluate code responses produced by freelance trainers against prompts and technical expectations.

This is a contract, part-time role requiring 20+ hours per week, paid at $14 USD per hour. The project is expected to run approximately 3–6 months.

• Employment type: Contractor, Part-time
• Time commitment: 20+ hours/week
• Rate: $14 USD/hour
• Expected duration: 3–6 months

What you'll do

Your core responsibility is to review code submissions for correctness, completeness, and conformity to the prompt. You will provide clear, actionable feedback that helps improve both the code and the training process.

• Compare code responses to the original prompts and confirm requirements are met
• Check technical correctness, Swift best practices, and iOS-specific considerations
• Identify bugs, performance issues, missing edge-case handling, and security concerns
• Provide concise, constructive feedback and suggested fixes to trainers
• Work independently to meet weekly review targets and maintain high accuracy

Requirements

Candidates must meet the following mandatory requirements. We will verify these during screening and in applications.

• Extensive real-world Swift/iOS development experience — minimum 5 years required
• Proven ability to analyze, optimize, and review code; strong problem-solving skills
• Minimum English proficiency of CEFR B2; you must state your English level in your application
• Detail-oriented with a commitment to accuracy and thorough QA work
• Able to produce high-quality work independently with minimal supervision
• Familiarity with AI model training or QA on AI-data platforms (Remotasks, Scale AI, Appen, etc.) is a plus
• Adaptable to new tools and workflows; excellent written communication and feedback skills

Who should apply

Experienced Swift engineers who enjoy code review and mentoring, and who want to apply their expertise to improve AI training, should consider this role. Ideal applicants are self-directed, comfortable giving precise technical feedback in English, and available for regular weekly hours.

• You are a senior/intermediate Swift developer with a strong QA mindset
• You want flexible, remote contract work and can commit 20+ hours/week
• You can clearly explain issues and suggested fixes in English (CEFR B2 or higher)

How to apply

When you apply, include a brief summary of your Swift/iOS experience (years), any relevant AI training or QA background, and your weekly availability. IMPORTANT: state your English proficiency level using the CEFR scale (we require at least B2).

• Confirm your years of Swift experience (minimum 5) and typical weekly availability
• State your English proficiency (CEFR) — B2 minimum required
• Applications will be reviewed and candidates may be asked to complete a short code-review exercise