Frontend Engineer (Performance & UI Rendering)
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 optimize latency and real-time user experience
* Leverage AI tools to accelerate development while focusing on performance, edge cases, and UI quality
Requirements:
Technical
* Deep understanding of DOM behavior and performance trade-offs
* Experience with Canvas API or rendering libraries (e.g., PixiJS or Fabric.js)
* Solid knowledge of frontend performance optimization techniques
* Experience using Web Workers to offload work from the main thread
* Experience with modern CSS and performance-oriented styling
AI & Development
* Experience using AI-assisted development tools (e.g., Cursor or similar)
* Ability to use AI as a productivity multiplier without compromising code quality
Profile
* Strong focus on smooth UI and rendering performance (60fps mindset)
* High level of English proficiency, with strong communication skills in an international team environment
* Attention to detail in user experience and visual quality
* Background in demanding frontend environments (e.g., interactive apps, data visualization, or graphics-heavy web applications)
* Pragmatic, execution-focused mindset
What We Offer:
* Hybrid work model (with preference for our offices in Alcobendas, Valencia, Barcelona, Sevilla, or Logroño)
* Flexible compensation package
* Discounts on Arsys products
* Discounts on technology brands
* Personalized training and development plans
* Biannual team events
* Access to advanced AI tools with no usage restrictions
* Challenging frontend problems in high-performance environments
* Engineering culture focused on quality, performance, and continuous improvement
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