Frontend Web Developer — HTML/CSS/JS (US & Canada)

About OpenTrain

OpenTrain is the #1 platform for building careers in AI training and data labeling. We connect skilled contributors with projects that teach AI systems how to read, reason, and write — all from anywhere with an internet connection.

Working through OpenTrain means joining a fast-growing industry where contributors shape how state-of-the-art models behave. Many roles are flexible, remote, and accessible to people who bring practical skills and attention to detail.

About AI Training Work

AI training (data labeling / annotation) is the human work behind intelligent systems: people create and verify examples that models learn from. This role focuses on web UI and frontend code — tasks that require technical judgment, precision, and the ability to explain choices clearly.

These projects are great for developers who want flexible, part-time work that directly impacts how web-aware AI systems understand and generate code and user interfaces.

The Role

You will analyze website screenshots and frontend code to create detailed annotations, author question-and-answer pairs, and propose or implement HTML/CSS/JS improvements that meet given requirements. This is a contractor, part-time role for contributors based in the United States or Canada.

You should be able to start immediately and commit to project deadlines while working at least 20 hours per week.

• Contract type: Contractor, part-time.
• Location: Must be located in the USA or Canada.
• Hours: 20+ hours/week, flexible within project needs.

What You'll Do

Daily tasks combine technical review, annotation, and light coding. Expect to spend time inspecting UI elements, writing precise labels and QA pairs, and editing or proposing frontend code fixes.

Quality, clarity, and consistency are critical: your annotations and code edits must match project guidelines and be easy for reviewers and models to consume.

• Create detailed annotations from website screenshots and related assets.
• Author question-and-answer pairs that test UI behavior and content understanding.
• Edit or improve HTML, CSS, and JavaScript to satisfy specified requirements (responsiveness, accessibility, cross-browser compatibility).
• Document decisions and explain technical fixes in clear English.

Requirements

All requirements below come from the project brief. Do not apply unless you meet them.

This role focuses on frontend development knowledge applied to annotation and code-correction tasks.

• Minimum 2 years of professional frontend experience using HTML, CSS, and JavaScript.
• Strong understanding of responsive design and cross-browser compatibility.
• Excellent analytical skills and attention to detail for creating annotations and improving code quality.
• Located in the United States or Canada and able to start immediately.
• Availability for 20+ hours per week; contractor status.
• Willingness to submit a competitive hourly rate (maximum $25/hour; target $20/hour).

Interview & Evaluation

Candidates will be evaluated on technical answers, practical examples, and English writing clarity. Interview responses will strongly influence scoring.

Provide clear, detailed answers — especially to the sample questions below — and explain technical ideas in plain language as if speaking to a non-technical client.

• HTML: Explain the difference between id and class attributes and when to use each.
• CSS: Describe how you would implement a responsive grid layout and which CSS properties you'd use.
• JavaScript: Explain how closures work and give an example of a beneficial use case.
• English proficiency: Describe a recent challenging project, how you resolved it, and explain a technical issue to a non-technical client in detail.

Compensation & Schedule

This project pays hourly in USD. Compensation is determined by the hourly rate you submit; the maximum allowed is $25/hour and the target rate is $20/hour. This posting lists $23/hour as the reference hourly rate.

Please submit your most competitive hourly offer — your proposed rate is an important factor in hiring decisions.

• Payment type: Hourly (USD).
• Submit your hourly rate; do not exceed $25/hour.
• Target rate for consideration: $20/hour.
• Expected weekly commitment: 20+ hours.

How to Apply

When you apply, include your hourly rate (up to $25/hr), a brief summary of relevant frontend work, and examples or links demonstrating HTML/CSS/JS experience where possible.

Prepare written answers to the interview questions above — these will be reviewed and scored as part of the application. If selected, you should be ready to start immediately.

• Provide: hourly rate, location (US/Canada), years of experience, availability, and sample work or links.
• Answer the technical and English-proficiency questions in writing as part of your application.
• Be prepared for follow-up tasks or a short code/annotation test to confirm fit.