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
- Develop fast, responsive user interfaces using modern JavaScript
- 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
- Strong experience with modern JavaScript (ESNext)
- 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)
- Adaptable working hours
- 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