Frontend UI Developer — React/Next/Svelte (Part‑Time)

About OpenTrain AI

OpenTrain AI is the hiring and contracting organization for this role. OpenTrain is the #1 platform for people who start and grow careers in AI training and data labeling — it connects flexible, remote work with real projects that teach and refine modern AI systems.

We hire contributors across skill levels to do the human work that teaches AI. For this position you will join a small, fast‑moving team focused on frontend quality, UX, and reproducible delivery.

About AI training and why it matters

AI training (also called data labeling or human feedback work) is the human side of building AI systems. Contributors create and refine the examples and interfaces that models learn from, and UI quality directly shapes how these tools are experienced.

These projects are 100% remote, often part‑time and flexible, and accessible to developers who want practical, cutting‑edge work that impacts production AI behavior.

The role

You will implement and refine user‑facing features, build reusable responsive components, and polish interfaces for usability, accessibility, and performance. Expect hands‑on coding, close collaboration with other engineers and coding agents, and careful documentation so results are reproducible.

• Ship clean, maintainable frontend code using React, Angular, Next.js, or Svelte.
• Build responsive, cross‑browser components with strong CSS (Tailwind or Bootstrap).
• Optimize accessibility and performance; document design and technical decisions.
• Work with coding agents and modern JS tooling (npm, bundlers, CI) in daily workflows.

What you'll do day to day

Typical tasks combine feature development, UX polish, and delivery pacing. You will be measured on speed, quality, and clarity of work and documentation.

• Implement UI features and interactive flows from specs or prototypes.
• Create responsive components and ensure cross‑browser consistency.
• Run accessibility checks and improve ARIA/keyboard support where needed.
• Profile and optimize frontend performance for real user scenarios.
• Write developer documentation and reproducible reasoning for changes.

Requirements

You must meet the core experience and availability requirements below. Submit 2–3 public web app URLs you built so we can evaluate portfolio strength.

• 2–4 years professional frontend or full‑stack development experience.
• Proficiency with at least one: React, Angular, Next.js, or Svelte.
• Strong CSS skills (Tailwind or Bootstrap) and a refined UI/UX sensibility.
• Portfolio: 2–3 public webapp URLs you built (required).
• English B1/B2 conversational; strong written documentation and communication.
• Comfortable with Git workflows and modern JS tooling (npm, bundlers, CI).
• Delivers responsive, cross‑browser, accessibility‑minded interfaces.
• Availability: 17–20 hrs/week (ideal 8 hrs/day); minimum ≥3 hrs/day.
• Able to meet pilot pace of 2,500–5,000 items within 1 week.
• Coding‑agent experience (e.g., Lovable) is a plus but not required.
• Bachelor's degree in CS or related is preferred but not required.

Compensation & schedule

This is a contract, part‑time role paid hourly. Baseline compensation is $10–$30 per hour. Exceptional developers with strong portfolios, fast delivery, and standout UX craftsmanship may be paid up to $40–$50 per hour.

You will choose your hours within the availability window; daily minimum applies to keep steady progress on pilot tasks.

• Employment type: Contractor, Part‑time.
• Expected time commitment: Less than 20 hours/week (typical 17–20 hrs/week).
• Pay: Baseline $10–$30/hour; up to $40–$50/hour for exceptional contributors.

How to apply

Apply through your OpenTrain AI profile. Include 2–3 public web app URLs you built, a brief note describing your role in each project, your typical weekly availability, and your expected hourly rate (within the stated range).

We evaluate portfolio quality, delivery speed, and UX craftsmanship when assigning final pay. Clear documentation samples or links to code repositories are strongly encouraged.

• Required: 2–3 public web app URLs and short role descriptions for each.
• State your weekly availability and minimum daily hours.
• Include links to code repos or documentation if available.