Frontend Web Developer (HTML/CSS/JS), C1/C2

August 14, 2026

About OpenTrain

OpenTrain is the #1 platform for people building careers in AI training and data labeling. We hire and contract contributors to help shape how modern AI systems behave — and we pay for real work that improves models and datasets.

We offer flexible, remote roles that let you work part-time or full-time with clear, technical tasks. For this project, OpenTrain is the hiring organization and will manage onboarding, tasks, and payments.

Remote, contractor-friendly work with flexible scheduling.
Work directly on data used to train and evaluate AI systems.
Create transferable experience in an industry that’s rapidly growing.

About AI training and why it matters

AI training (data labeling/annotation) is the human work behind every major AI system. People prepare examples, evaluate outputs, and refine code/annotations so models learn to behave correctly.

This role focuses on the frontend web domain: your technical skills and careful annotations will be used to build better web-focused training data and code examples for models.

Contribute to state-of-the-art AI by creating high-quality, reproducible annotations and code.
Gain hands-on experience that’s highly relevant to web engineering and ML-assisted tooling.

The role

You will analyze website screenshots, create challenging question-and-answer pairs, produce sketch-style annotations (e.g., marking elements or layout regions), and edit or improve HTML/CSS/JS code to meet task specifications.

Work is contractor, part-time, remote, and requires immediate availability. Tasks emphasize precision, creativity, and technical skill to produce high-quality artifacts used for model training and evaluation.

Schedule: 20+ hours per week.
Pay: $13 USD per hour (PAY_PER_HOUR).
Employment Types: Contractor, Part-time.
Label types include bounding boxes and programming/coding annotations.

What you'll do (key responsibilities)

Daily tasks combine visual analysis with frontend coding. Expect short, focused assignments that require reading a screenshot or spec, annotating UI elements, and producing working HTML/CSS/JS edits or examples.

Create challenging question-and-answer pairs about web layouts and components.
Draw sketch annotations or bounding boxes on screenshots to identify elements and layout areas.
Edit and optimize HTML, CSS, and JavaScript based on task requirements.
Ensure responsive behavior, cross-browser compatibility, and clean, maintainable code.
Deliver work promptly and follow task-specific guidelines for format and quality.

Requirements

Candidates must meet all of the following requirements. OpenTrain will verify documentation and readiness to start immediately.

Location: Must be located in India.
Language: English proficiency at C1 or C2 level, with official documentation to validate this level.
Experience: Minimum 2 years hands-on frontend development using HTML, CSS, and JavaScript.
Technical skills: Strong understanding of responsive design, cross-browser compatibility, and code optimization.
Availability: Able to start immediately and commit to project timelines (20+ hrs/week).
Attention to detail: Ability to create precise annotations and produce high-quality code edits.

Interview questions and evaluation

We evaluate candidates with open-ended technical and writing questions to judge both frontend skill and English proficiency. Interviewers should use non-leading questions (ask open questions such as 'What is your English level?' and 'How many years of HTML/CSS/JS experience do you have?').

Technical — HTML: Explain the difference between semantic and non-semantic HTML elements and why semantic elements matter.
Technical — CSS: How would you design a responsive navigation bar? What techniques or tools would you use to ensure it works across devices?
Technical — JavaScript: Describe event delegation and give an example where it’s preferable to attaching listeners directly.
English proficiency — Writing task 1: Describe a challenging project you recently worked on and how you overcame the difficulties (detailed response required).
English proficiency — Writing task 2: Explain a complex technical issue to a non-technical client in clear, accessible language (detailed response required).
Documentation requirement: Ask whether the candidate already has official C1/C2 documentation and request they share it within the day. Candidates who cannot provide documentation immediately should be scored 5 or lower on the interview score.

How to apply

Apply through your OpenTrain account with the following information. Applications that omit required documentation or the open-ended responses below cannot be considered.

Confirm you are located in India and available to start immediately.
State your English level (C1/C2) and whether you can provide official documentation today.
State your years of hands-on HTML/CSS/JS experience and relevant examples of past work.
Answer the interview writing prompts included above in your application.
Include your weekly availability (confirm 20+ hrs/week) and any other scheduling constraints.