Frontend Engineer Talent Network

$70–150/hrrate as listed

Mercor maintains a standing network of frontend engineers who write, review, and grade tasks used to train and evaluate AI coding models. You apply once, pass an AI-led screen, and get matched to project work as labs request frontend expertise — typically 15–30 hours per week, remote and async.

Summary, eligibility guidance and screening preparation are prepared by Sidequest from the platform's posting. Check the source listing before applying.

What the work actually involves

This is not a product engineering job. You are producing training and evaluation data for frontier models working on frontend problems. In practice that means authoring realistic tasks — a component with a subtle re-render bug, a layout that breaks at a specific breakpoint, a state management refactor with hidden coupling — then writing the reference solution and the criteria a grader would use to judge a model's attempt. Other project types lean toward review: you read model output, decide whether the JSX actually compiles and behaves as claimed, and write a rubric-anchored justification. Some engagements involve side-by-side preference ratings across model responses, where the hard part is articulating why one answer is better rather than just picking it.

Quality bars are stricter than most engineers expect. Reviewers check whether your task is actually solvable, whether your test cases discriminate between a correct and a plausible-but-wrong answer, and whether your written reasoning would hold up if someone disagreed with you. Vague feedback like "code could be cleaner" gets rejected.

What the platform screens for

Mercor runs an AI interview before you enter the network. It probes for verifiable specifics from your own work — which framework, which version, what broke, what you measured. Expect follow-up questions that go a layer deeper than your first answer, particularly around rendering behavior, state management tradeoffs, and performance profiling. Generic framework knowledge that reads like documentation tends to score poorly; concrete debugging stories with numbers tend to score well. The screen also assesses written communication, since nearly all deliverables are written English.

Logistics and pay

Fully remote, async, and self-scheduled; there are no standing meetings on most projects.
Typical commitments run 15–30 hours per week, with project length varying from a few weeks to several months.
Observed rates for this network fall in the $70–150/hr range depending on project, seniority, and client. Rates are set per engagement and are not guaranteed by joining the network.
Approval into the network does not produce immediate work. Matching is rolling and depends on what labs are requesting; some approved experts wait weeks before a relevant project opens.

What they look for

Professional frontend experience with React, Vue, or Angular in production codebases
Strong HTML/CSS and responsive UI development
State management and rendering-performance optimization (profiling, memoization, bundle analysis)
Clear written technical English — able to justify a judgment in a paragraph
Self-directed remote work with no daily supervision
Familiarity with code review or rubric-based evaluation (helpful, not required)

Before you apply

Would you pass this screen?

Drawn from what this listing actually requires. Answered in your browser — nothing is sent to us, and we do not store your answers.

Do you have at least 2 years of professional experience building and shipping frontend code in production?
Professional frontend development experience · required
Do you have hands-on production experience with at least one modern JavaScript framework (React, Vue, or Angular)?
Modern framework fluency · required
Are you located in and able to work remotely from a country or region where Mercor operates and where you can legally receive contract payments?
Remote work location · required
Can you write semantic HTML and CSS from scratch without relying solely on component libraries or frameworks?
HTML and CSS proficiency · preferred

0 of 4 answered

Included with this listing

Interview prep — 10 questions

Matched to what this platform's screening actually measures. Answer each out loud in 60–90 seconds: claim → concrete example → implication.

What it tests: Whether you have hands-on production experience with modern frameworks and can articulate concrete decisions made during responsive design work, not just naming tools.
A strong answer: Name the specific framework (React/Vue/Angular), describe the actual layout problem you solved (e.g., breakpoint strategy, flexbox/grid choice), and explain why that approach worked—evidence of real shipped work, not tutorial knowledge.
Where people lose it: Staying generic ('I used React to build responsive layouts') without naming a real project, the specific challenge, or the decision you made—signals pattern-matching from documentation rather than lived experience.