Senior Frontend Engineer - 100% Remote

5-8+ years of professional experience in frontend development, with a strong focus on Progressive Web Applications (PWAs).

Proven experience designing and architecting scalable, high-performance PWA solutions, preferably for eCommerce platforms.

Solid expertise building responsive, mobile-first user interfaces using modern JavaScript frameworks such as React, Angular, or Vue.js.

Demonstrated experience integrating frontend applications with backend APIs and enterprise systems, including platforms such as Salesforce Commerce Cloud, MuleSoft, or similar middleware solutions.

Strong knowledge of cross-browser compatibility, web accessibility standards (WCAG), and SEO best practices.

23 days of Annual Leave plus the 24th and 31st of December as discretionary days! Numerous benefits (Health Care Plan, teleworking compensation, Life and Accident Insurances). Retribución Flexible´ Program: (Meals, Kinder Garden, Transport, online English lessons, Health Care Plan…) Free access to several training platforms Professional stability and career plans UST also, compensates referrals from which you could benefit when you refer professionals. The option to pick between 12 or 14 payments along the year. Real Work Life Balance measures (flexibility, WFH or remote work policy, compacted hours during summertime…) UST Club Platform discounts and gym Access discounts

More in details, UST is a multinational company based in North America, certified as a Top Employer and Great Place to Work company with over 35.000 employees all over the world and presence in more than 35 countries. We are leaders on digital technology services, and we provide large-scale technologic solutions to big companies. What we look for? For one of our key clients, we are currently looking for a Senior Frontend Engineer with experience working with modern frameworks like React, Vue or Angular. Main tasks and accountabilities will be: 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 optimization. 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 Commerce Cloud and MuleSoft.