About OpenTrain

OpenTrain AI is the hiring and contracting organization for this role. OpenTrain is the #1 platform for finding and building careers in AI training and data labeling, helping people discover projects, create a profile, and apply in minutes. Creating an OpenTrain account is free.

• Fully remote contract opportunity
• Part-time schedule with 20+ hours per week
• Pay rate of $30 USD per hour

About AI Training and Coding Evaluation

AI training is the human side of building modern artificial intelligence. Engineers and other specialists prepare, review, and evaluate examples that help AI systems understand code, generate useful responses, and follow software development best practices.

In this coding-focused work, your reviews help assess the correctness, quality, clarity, and usefulness of programming tasks and unit tests. It is an opportunity to apply practical engineering judgment to the development of high-quality AI systems.

• Work on coding artifacts and unit tests used in AI training
• Apply software engineering, debugging, and code review expertise
• Contribute to a fast-growing, cutting-edge area of technology

The Role

OpenTrain AI is seeking Full-Stack Software Engineers to work as QA Reviewers for coding tasks and unit tests. You will conduct in-depth quality reviews, verify whether tasks are correct, identify opportunities for improvement, and provide actionable feedback.

The role focuses on either Python or JavaScript. Candidates must have strong proficiency in at least one of these languages, along with substantial full-stack development experience and a strong understanding of code quality and testing.

• Contractor position with part-time status
• Remote and flexible schedule
• 20+ hours per week
• $30 USD per hour
• Work in English

What You'll Do

You will review technical artifacts carefully and help create a consistent, efficient QA process. The work requires strong attention to detail, sound technical judgment, and the ability to explain findings clearly to stakeholders and fellow QA reviewers.

• Review coding tasks and unit tests for correctness and quality
• Analyze, debug, and evaluate complex codebases and technical artifacts
• Identify errors, redundancies, gaps, and ambiguities
• Provide detailed, constructive feedback on code structure, quality, and functionality
• Verify that coding tasks meet the required standards
• Refine QA rubrics to improve quality and efficiency
• Collaborate with stakeholders to resolve ambiguities and inefficiencies
• Work with QA reviewers to scale the process and maintain consistency

Requirements and Qualifications

This role requires at least five years of full-stack software development experience, including a focus on code reviews and quality assurance. You should be comfortable writing, testing, reviewing, and explaining code in Python or JavaScript.

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

• Minimum five years of full-stack software development experience
• Strong proficiency in Python or JavaScript
• Experience writing, testing, and reviewing code
• Deep understanding of unit testing frameworks and best practices
• Ability to analyze, debug, and evaluate complex codebases
• Ability to identify gaps, redundancies, and ambiguities in coding tasks and tests
• Strong written and verbal English communication skills
• Exceptional attention to detail and critical-thinking ability
• Experience with coding-focused AI training is highly preferred
• Teaching or mentoring experience in coding environments is a plus

Experience Details to Share

Applicants should be prepared to describe their experience in detail during the application or interview process. In particular, OpenTrain AI needs to understand your total full-stack development experience and your separate experience with JavaScript and Python, even though you will be assigned to work on only one language.

• State exactly how many years of full-stack development experience you have
• State exactly how many years of full-stack JavaScript experience you have
• State exactly how many years of full-stack Python experience you have
• Describe your experience with code review, QA, and unit testing
• Explain how you provide clear, actionable technical feedback
• Describe any coding instruction, mentoring, or AI training experience

Technical Assessment Questions

As part of the interview, applicants must complete both technical questions before the interview is finished. Your responses will be considered when evaluating your fit for the role.

Question 1: Code Review and Debugging. Review this Python function and identify potential issues or improvements. Explain why each suggestion is necessary: calculate_average(numbers) sets total to zero, adds each number to total, divides total by len(numbers), and returns the result. Address at least two issues or improvements in your response.

Question 2: Annotating Code for AI Training. Add clear inline comments explaining each line of this JavaScript function: function isPalindrome(str) { str = str.toLowerCase().replace(/[^a-z0-9]/g, ''); let reversedStr = str.split('').reverse().join(''); return str === reversedStr; }. Highlight assumptions and edge cases the function may need to handle.

• Explain at least two issues or improvements in the averaging function
• Provide reasoning for every code review suggestion
• Add concise comments to each line of the palindrome function
• Explain assumptions and possible edge cases in the JavaScript function
• Complete both questions before the interview concludes

How to Apply Through OpenTrain

Create a free OpenTrain account to build your AI training profile and apply for this opportunity. Highlight your full-stack experience, language-specific background, testing expertise, and examples of thoughtful code review. OpenTrain AI will use your application and interview responses to evaluate your fit for the QA Reviewer role.

• Create or update your free OpenTrain profile
• Include exact years of experience with full-stack development, JavaScript, and Python
• Showcase your code review, debugging, and unit testing skills
• Complete the required technical interview questions
• Apply remotely for this flexible contract opportunity