Frontend Web Developer — JavaScript/TypeScript (React/Vue/Angular)

About OpenTrain

OpenTrain is the #1 platform for people starting and growing careers in AI training and data labeling. We connect skilled contributors with projects that shape how modern AI systems behave, and we hire directly for many roles as OpenTrain AI.

Working with OpenTrain means joining a fast-growing industry where remote, flexible contracting is common and you can immediately impact real products by applying your technical craft to data and model-quality tasks.

About AI training and why frontend engineers matter

AI training (data labeling / human feedback work) is the human side of building intelligent systems: people create, review, and refine the examples models learn from. Good tooling and interfaces are essential — clean, performant frontends let contributors annotate data accurately and at scale.

As a frontend developer on OpenTrain projects you'll build the interfaces where annotators, reviewers, and engineers interact with data and models, directly improving workflow efficiency, data quality, and model behavior.

The role

We are hiring up to 30 frontend developers to build, refine, and maintain elegant, high-performance web interfaces for annotation and QA workflows. This is a remote, contract, part-time role with an expected minimum commitment of ~17–20 hours per week (ideally ~4 hours/day).

• Position type: Contractor, part-time (remote, worldwide).
• Hours: Minimum ~17–20 hrs/week; preferred cadence ~4 hrs/day.
• Pay: $35 USD per hour.

What you'll do

Deliver production-ready, responsive components from designs and specs. You'll translate Figma/Sketch mockups into robust UI, enforce accessibility and usability best practices, and optimize for performance and cross-browser compatibility.

• Translate mockups into responsive, production-ready components.
• Enforce accessibility (a11y), UI/UX best practices, and pixel‑perfect visual polish.
• Review and improve existing implementations, documenting technical decisions and trade-offs.
• Collaborate with project operations to deliver to spec and on schedule.

Requirements

You must meet all mandatory requirements for your application to be reviewed. During the interview you will be asked to paste a public live portfolio URL — applications without an accepted public link will not be reviewed.

• 2–6 years professional frontend or full-stack development experience.
• Strong proficiency in JavaScript and TypeScript.
• Expertise in one or more frameworks: React, Next.js, Vue, or Angular.
• Advanced HTML5/CSS3, responsive layouts, and accessibility best practices.
• Experience with design systems such as Tailwind, Bootstrap, or Material UI.
• Proven eye for visual polish and usability; ability to deliver pixel‑perfect UI and smooth interactions.
• Ability to convert Figma/Sketch mockups into production-ready components.
• Solid understanding of performance optimization and cross-browser compatibility.
• Clear written English (C1 or higher) and ability to document reasoning and trade-offs.
• Availability for a minimum of 17–20 hours/week (preferred ~4 hrs/day).
• Mandatory: a public, live portfolio link (Dribbble, Behance, GitHub Pages, CodePen, Vercel, etc.). Files, screenshots, or private links are not accepted; applicants must provide a public link. Do not send files—only links.

Who should apply

Apply if you enjoy shipping polished UI, care about accessibility and performance, and can reliably deliver in a part-time remote contract setting. This role suits frontend specialists and full-stack engineers focused on client-side engineering and design-system work.

• Frontend engineers with a track record of production UI work and a public portfolio.
• Developers comfortable working independently and documenting technical trade-offs in clear written English.
• People who want flexible, remote part-time contracting in a fast-growing AI training environment.

How hiring and work will run

Applications are reviewed only when you provide a public portfolio link. During interview you will paste the link into the form; we will not accept uploaded files or private links. Selected contractors will receive assignment details, tasks, and delivery expectations from OpenTrain AI and will collaborate with project operations to meet schedules.

• Interview step requires pasting a public portfolio URL (no files or private links).
• Assignments will include clear specs, mockups, and acceptance criteria.
• We plan to hire multiple developers; onboarding and tasks are managed by OpenTrain AI.