Frontend Engineer – Remote (up to $85/hr)

About the role

Mercur is looking for a Frontend Engineer to work remotely on cutting‑edge AI coding agents. You will evaluate and improve model‑generated frontend code, ensuring it meets quality, accessibility, and performance standards.

Key responsibilities

• Use frontier AI coding agents to complete complex engineering tasks.
• Review model‑generated frontend code for correctness, maintainability, accessibility, and performance.
• Identify bugs, edge cases, and failure modes in model outputs.
• Compare outputs from multiple frontier models and assess strengths and weaknesses.
• Apply professional engineering judgment to realistic frontend scenarios.

Required profile

• 2+ years of professional frontend engineering experience.
• Experience building modern web applications with React, TypeScript, or JavaScript.
• Regular use of AI coding agents such as Cursor, Claude Code, Codex, Windsurf, or Gemini CLI.
• Ability to evaluate model‑generated implementations, UI architecture, and performance optimizations.

Required skills

• React
• TypeScript
• JavaScript
• Cursor (AI coding agent)
• Claude Code (AI coding agent)
• Codex (AI coding agent)
• Windsurf (AI coding agent)
• Gemini CLI (AI coding agent)

What we offer

• Up to $85 per hour
• $400 per accepted task