Advanced Swift/iOS QA Engineer — Code Review for AI Training

About OpenTrain

OpenTrain is the #1 platform for building careers in AI training and data labeling. We connect skilled contributors with projects that teach and refine AI systems — everything from code and image labeling to RLHF and model evaluation.

Working through OpenTrain gives you access to flexible, remote work on cutting-edge AI training projects and helps you grow a profile in a fast-growing industry where human expertise directly shapes how AI behaves.

About AI Training Work

AI training (sometimes called data labeling or annotation) is the human side of building AI. For this project you'll review code examples produced to train models so that the model learns correct, secure, and idiomatic Swift/iOS practices.

This work is highly collaborative and impactful: your assessments and feedback improve model outputs, raise training data quality, and help define best practices that scale across future models.

The Role

We're seeking experienced Swift/iOS developers to join an ongoing AI model training project as Swift QA — AI Data Trainers who review and quality-assure code written in response to prompts.

This is a contractor, part-time role. The project is expected to run 3–6 months; contributors typically work 30–40 hours per week, and the listing requires availability for 20+ hours/week. You'll work remotely and independently to evaluate code outputs and provide actionable feedback.

• Position: Swift QA — AI Data Trainer (contractor, part-time)
• Project length: 3–6 months (ongoing project)
• Typical workload: many contributors work 30–40 hrs/week; listing requires 20+ hrs/week
• Pay: $14 USD per hour

What You'll Do

Your primary responsibility is to scrutinize code responses generated by freelance AI trainers and assess technical correctness, prompt adherence, and quality.

Provide clear, constructive feedback and corrections so the training dataset improves over time. Document issues, suggest fixes, and enforce best practices to ensure the model learns reliable Swift/iOS patterns.

• Review Swift/iOS code for correctness, style, performance, and safety
• Check that each code response matches the prompt requirements and intended behavior
• Provide written feedback and suggested fixes in English (technical, specific, actionable)
• Flag recurrent errors and help maintain QA standards for the dataset

Requirements

You must meet every substantive requirement listed below; applications that do not show these qualifications will not be considered.

We require evidence of your experience and clear confirmation of your English proficiency level (we require a minimum of B2). Please state your English level in your application.

• Minimum 5 years of real-world Swift/iOS development experience (this is required)
• Proven ability to analyze, optimize, and conduct thorough code reviews
• Strong problem-solving skills and attention to detail; able to work independently
• Minimum English proficiency: B2 (applicants must state their proficiency level when applying)
• Availability for at least 20 hours/week; many contributors work 30–40 hrs/week

Preferred Qualifications

These are not strictly required but will strengthen your application. Include relevant examples or past projects when you apply.

Experience doing QA/QC on AI data platforms or previous work with annotation projects is a plus.

• Experience with AI model training or reviewing training data for ML models
• Prior QA/QC or annotation work on platforms like OpenTrain, Scale AI, Appen, or similar
• Familiarity with secure coding practices, memory management, and Swift concurrency patterns

How To Apply

Submit a brief application that includes: a short summary of your Swift/iOS experience (years, notable projects), links to code samples or GitHub, confirmation that you meet the 5-year requirement, and your weekly availability.

Important: Tell us your English proficiency level and confirm you meet the minimum B2 requirement. Applications missing an explicit statement of English proficiency may not be reviewed.

• Include: years of Swift experience, example code or repo links, and weekly availability
• State your English proficiency level (must be B2 or higher)
• Rate: $14/hour (contractor, part-time); expected 3–6 month engagement