Frontend Engineer (Performance & UI Rendering)

Arsys · Spain, Alcobendas, Spain

Hybrid Full-time Senior Engineering

Job Description

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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Benefits

Remote / flexible work.
Team events and retreats.

Requirements

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
Experience using AI-assisted development tools (e.g., Cursor or similar)
Ability to use AI as a productivity multiplier without compromising code quality
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