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Frontend Software Engineer, Codex App

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Frontend Software Engineer, Codex App in UK new

  • London

Responsibilities

  • Build and ship polished, high-performance user interfaces across the Codex desktop app and IDE extension.
  • Partner with design to turn prototypes into production-quality layouts, motion, typography, and interactions.
  • Develop interfaces for agent delegation, task timelines, status and progress, handoffs, review, and control surfaces.
  • Own frontend architecture decisions involving component systems, state management, navigation, and rendering performance.
  • Improve quality and reliability through testing, instrumentation, and UX for failure modes.
  • Collaborate with platform, model, and backend partners to integrate capabilities into cohesive product flows.

Requirements

  • Strong experience with modern frontend stacks, particularly React and TypeScript.
  • High standards for UI craft and design engineering.
  • Experience building desktop-caliber product experiences with Electron or a similar technology.
  • Care about performance, responsiveness, and polished interaction quality.
  • Ability to explore ambiguous problems, iterate rapidly, and think in end-to-end workflows.
  • Experience with developer tools or IDE extensions is a nice-to-have.

Salary: $230k - $385k/yr

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