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 elementsEnsure a smooth 60fps experience across all user interactions (scrolling, typing, zooming)Move performance-critical rendering logic from the DOM to Canvas or hardware-accelerated technologiesRefactor 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 performanceCollaborate with other teams to optimize latency and real-time user experienceLeverage AI tools to accelerate development while focusing on performance, edge cases, and UI qualityRequirements: Technical Deep understanding of DOM behavior and performance trade-offsExperience with Canvas API or rendering libraries (e.g., PixiJS or Fabric.js)Solid knowledge of frontend performance optimization techniquesExperience using Web Workers to offload work from the main threadExperience with modern CSS and performance-oriented stylingAI & Development Experience using AI-assisted development tools (e.g., Cursor or similar)Ability to use AI as a productivity multiplier without compromising code qualityProfile Strong focus on smooth UI and rendering performance (60fps mindset)High level of English proficiency, with strong communication skills in an international team environmentAttention to detail in user experience and visual qualityBackground in demanding frontend environments (e.g., interactive apps, data visualization, or graphics-heavy web applications)Pragmatic, execution-focused mindsetWhat We Offer: Hybrid work model (with preference for our offices in Alcobendas, Valencia, Barcelona, Sevilla, or Logroño)Flexible compensation packageDiscounts on Arsys productsDiscounts on technology brandsPersonalized training and development plansBiannual team eventsAccess to advanced AI tools with no usage restrictionsChallenging frontend problems in high-performance environmentsEngineering culture focused on quality, performance, and continuous improvement
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