Frontend / UI Engineer

Confidential; United States; Remote; USD 110,000 - 138,000; Part time

Job summary

Zekai is seeking a Frontend / UI Engineer for a fully remote, project-based contract. You will turn design material into rigorous, verifiable coding tasks and provide a reference implementation.

Strong React/TypeScript skills and a public GitHub profile are essential, along with the ability to explain behavior and verification steps. Applicants worldwide are welcome; the engagement is paid per approved task and requires practical, demonstrable frontend expertise and clear communication in

Qualifications

• Strong frontend engineering: React, TypeScript, or similar, with experience shipping complex interfaces and interactions.
• Able to read, modify, debug and validate real application code.
• Strong written English, and the ability to explain expected behavior and reproducible verification steps.

Responsibilities

• Design multi-step coding tasks grounded in visual material: screenshots, UI mockups, diagrams, or screen recordings of real workflows.
• Specify which code and artifacts the task involves, and what the expected behavior is.
• Define objective success criteria — how someone would verify the task was completed correctly, not just plausibly.
• Provide a working reference implementation.
• Review tasks built by other contributors for technical accuracy and verifiability.
• Flag tasks that turn out to be ambiguous or ungradable rather than submitting them.

Skills

React

TypeScript

Frontend engineering

UI development

Tools

GitHub

Code review

SVG/Canvas

Job description

Role Title: Frontend / UI Engineer

Role Type: Contractor

Location: Remote

Opportunity Snapshot

Pay: $80–100/hour equivalent (approximately $640–800 per task)

Time per task: ~8 hours

Engagement: Project-based — paid per approved task

Location: Fully remote

You’ll need: A public GitHub profile with substantial, verifiable contributions

Your tasks: Turn screenshots, diagrams and videos into challenging coding tasks with objective success criteria

What you’ll do

• Design multi-step coding tasks grounded in visual material: screenshots, UI mockups, diagrams, or screen recordings of real workflows.
• Specify which code and artifacts the task involves, and what the expected behavior is.
• Define objective success criteria — how someone would verify the task was completed correctly, not just plausibly.
• Provide a working reference implementation.
• Review tasks built by other contributors for technical accuracy and verifiability.
• Flag tasks that turn out to be ambiguous or ungradable rather than submitting them.

What we’re looking for

• A public GitHub profile with substantial, verifiable contributions — commits, merged PRs, or repositories you maintain. This is essential.
• Strong frontend engineering: React, TypeScript, or similar, with experience shipping complex interfaces and interactions.
• Able to read, modify, debug and validate real application code.
• Experience with UI, graphics, SVG, or Canvas work is especially valuable.
• Product or UI designers with hands-on frontend implementation and public code contributions are also a fit.
• Strong written English, and the ability to explain expected behavior and reproducible verification steps.
• Prior data labeling, AI evaluation, or rubric-based review experience is a plus, not a requirement.

How the selection process works

• Apply and complete the screening questions
• Complete the AI interview for this role — it’s how your expertise gets in front of the client
• Profile review
• Onboarding — our Talent Ops team will get you set up

This is a 100% remote contract role, open to applicants worldwide in the countries the employer accepts.