AI-First Front-End Engineer (JS/TS) – Hybrid

arsys; Albal; Hybrid; EUR 42,000 - 66,000; Full time

Benefits offered by this job

Health insurance

Daycare allowance

Meal vouchers

Flexible working hours

Hybrid work in Spain offices

Job summary

Arsys is seeking a frontend developer to own the JavaScript/TypeScript layer of EuroOffice, driving architecture, performance, and robust bug investigation. AI is embedded as a core working method to accelerate development while maintaining technical rigor.

You will optimize rendering, loading times, and contribute to feature refinement, with opportunities to work across modern web technologies in a hybrid setup across Valencia or other offices.

Qualifications

• Strong knowledge of modern JS/TS with focus on performance and code quality.
• Experience using AI as a development multiplier and ability to validate AI-generated output.
• Professional English for daily technical communication.
• Comfort debugging complex legacy code and large codebases.
• Familiarity with Canvas or WebGL is a plus.

Responsibilities

• Code, review, and maintain clean JS/TS with solid state management.
• Identify and fix rendering and load performance bottlenecks across DOM and Canvas.
• Continuously refine features based on usage and edge cases.
• Investigate and resolve complex bugs in large, partially undocumented codebases.
• Leverage AI across workflows to speed implementation and document work.

Skills

Modern JS/TS

AI integration

English fluency

Legacy debugging

Canvas/WebGL

Tools

DevTools

Lighthouse

Job description

Arsys is seeking a frontend developer to own the JavaScript/TypeScript layer of EuroOffice, driving architecture, performance, and robust bug investigation. AI is embedded as a core working method to accelerate development while maintaining technical rigor.

You will optimize rendering, loading times, and contribute to feature refinement, with opportunities to work across modern web technologies in a hybrid setup across Valencia or other offices.