Frontend Engineer (Performance & UI Rendering)

Arsys

Full-time Informática y tecnología
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Location
valencia, comunidad valenciana, Spain
Posted
June 04, 2026

Job Description

Mission:

Transform Nextcloud Office into a high-performance, modern web-based productivity suite, going beyond traditional DOM-driven applications. You will own the look and feel of the product, ensuring that even the most complex documents and spreadsheets remain fast, smooth, and responsive under heavy load.

Responsibilities:

  • Build new frontend features such as advanced charts, conditional formatting, and interactive document elements
  • Ensure a smooth 60fps experience across all user interactions (scrolling, typing, zooming)
  • Move performance-critical rendering logic from the DOM to Canvas or hardware-accelerated technologies
  • Refactor legacy styles into a modern, performance-optimized CSS system based on variables (supporting dark mode and high-contrast themes)
  • Implement responsive UI patterns such as optimistic UI to improve perceived performance
  • Collaborate with other teams to op...