Full-Stack Software Engineer for AI Training

About OpenTrain

OpenTrain AI is hiring contractors to help improve the quality of coding data used to train artificial intelligence. OpenTrain is the #1 platform for finding and building careers in AI training and data labeling, where contributors can discover projects, build a profile, and apply in minutes.

Creating an OpenTrain account is free. In this role, you will use your software development expertise to review coding tasks and unit tests that help shape how advanced AI systems understand and produce code.

• Remote contractor position
• Part-time schedule with 20+ hours per week
• Available to candidates in Australia, Canada, India, the Philippines, the United Kingdom, the United States, and Vietnam
• English-language work
• Pay: $30 USD per hour

About AI Training and Coding Evaluation

AI training is the human side of building modern artificial intelligence. People create, review, and evaluate examples so AI systems can learn to reason, communicate, and complete specialized tasks more reliably.

Coding specialists play an important role by checking whether programming tasks, solutions, documentation, and unit tests are correct, complete, and useful. Your feedback will help improve the quality and consistency of coding data used in AI development.

• Work directly on cutting-edge AI training workflows
• Apply software engineering and quality assurance expertise
• Help identify errors, ambiguities, gaps, and redundancies in coding materials
• Work remotely with a flexible schedule

The Role

OpenTrain is seeking experienced Full-Stack Software Engineers to work as QA Reviewers for coding tasks and unit tests. You will conduct detailed quality reviews of coding artifacts, verify task correctness, evaluate testing approaches, and provide actionable feedback.

The role requires a minimum of five years of full-stack software development experience, with a focus on code review and quality assurance. Strong proficiency in Python or JavaScript is essential, and you will be assigned to work on one of those languages. The position is listed as entry level in the project data but requires the technical experience described in the qualifications.

• Contractor and part-time engagement
• 20+ hours per week
• $30 USD per hour
• Fully remote and flexible schedule
• English proficiency required
• Work available in Australia, Canada, India, the Philippines, the United Kingdom, the United States, and Vietnam

What You’ll Do

You will review coding artifacts and unit tests in depth, checking their correctness, structure, clarity, and functionality. You will work with other QA reviewers and stakeholders to improve review consistency, resolve ambiguities, and scale an efficient quality assurance process.

• Review coding tasks and unit tests for correctness and completeness
• Analyze, debug, and evaluate complex codebases and technical artifacts
• Identify errors, redundancies, gaps, and ambiguities
• Provide detailed, constructive feedback on code quality, structure, and functionality
• Verify that coding tasks meet defined quality standards
• Refine QA rubrics to improve quality and efficiency
• Collaborate with stakeholders to address unclear requirements and inefficient processes
• Work with a team of QA reviewers to support consistency at scale

Qualifications and Requirements

You should be comfortable evaluating software written in Python or JavaScript and explaining technical findings clearly. Strong written and verbal English communication is mandatory because the work involves detailed feedback, documentation improvement, and collaboration.

Candidates based outside the United States, Canada, the United Kingdom, or Australia must provide documentation demonstrating C1 or C2 English proficiency, such as IELTS, TOEFL, or an equivalent certification.

• At least five years of full-stack software development experience
• Experience with code reviews and quality assurance
• Strong proficiency in Python or JavaScript
• The ability to report your years of full-stack experience in both JavaScript and Python, even though the assignment uses one language
• Extensive experience writing, testing, and reviewing code
• Deep understanding of unit testing frameworks and best practices
• Ability to analyze, debug, and evaluate complex codebases
• Strong problem-solving and critical thinking skills
• Exceptional attention to detail
• Ability to identify gaps, redundancies, and ambiguities in coding tasks and unit tests
• Excellent written and verbal communication skills
• Experience providing clear, constructive feedback
• Teaching or mentoring experience in coding environments is a plus
• Experience with LLM training for coding is highly preferred

Required Technical Assessment

Before the interview is completed, applicants must answer both technical questions below. Your responses should demonstrate practical code review, debugging, annotation, and communication skills.

Question 1: Code Review and Debugging. Review this Python function: def calculate_average(numbers): total = 0; for num in numbers: total += num; average = total / len(numbers); return average. Identify at least two potential issues or improvements, and explain why each suggestion is necessary.

Question 2: Annotating Code for AI Training. Add clear inline comments to explain each line of this JavaScript function and highlight assumptions or edge cases: function isPalindrome(str) { str = str.toLowerCase().replace(/[^a-z0-9]/g, ''); let reversedStr = str.split('').reverse().join(''); return str === reversedStr; } Comments should be concise and written to teach an AI system how the code works.

• Explain your reasoning for every proposed Python improvement
• Comment each line of the JavaScript function
• Identify assumptions and edge cases in the palindrome function
• Demonstrate clear, technically accurate written communication

Application Details

When applying, be prepared to answer open-ended questions rather than yes-or-no questions. State exactly how many years of full-stack development experience you have, how many years of experience you have with JavaScript, and how many years you have with Python.

You should also be ready to describe your experience with code review, quality assurance, unit testing, debugging, technical feedback, and any AI training, teaching, or mentoring work.

• Language: English
• Minimum availability: 20+ hours per week
• Eligible locations: AU, CA, IN, PH, GB, US, and VN
• Engagement: Contractor and part-time
• Apply through OpenTrain AI