Senior Frontend Engineer - 100% Remote (Castro Urdiales)

About UST

UST is a multinational company based in North America, certified as a Top Employer and a Great Place to Work. We have over 35,000 employees worldwide and a presence in more than 35 countries, leading in digital technology services for large-scale technological solutions.

Position

Senior Frontend Engineer with experience in modern frameworks such as React, Vue, or Angular.

Responsibilities

• Lead the development of Progressive Web Applications (PWAs) for complex digital environments.
• Design and architect scalable, high‑performance PWA solutions for eCommerce platforms.
• Implement advanced Service Worker strategies, including intelligent caching, offline capabilities, and performance optimisation.
• Develop responsive, mobile‑first user interfaces using modern frameworks such as React, Angular, or Vue.js.
• Integrate PWA frontends with backend APIs and enterprise platforms such as Salesforce Commer...