Senior Frontend Engineer - Spain - RemoteOur client is looking for a Senior Frontend Engineer who is more than a builder, you're a feature owner, a UX advocate, and someone who thrives on delivering meaningful, high-quality user experiences. You'll contribute to our design system, elevate our component architecture, and ensure the frontend remains fast, accessible, resilient, and scalable.What You Will DoArchitecture & StandardsPerformance LeadershipData & State StrategyDeveloper Experience (DX)Accessibility & UXCode Quality & MentorshipOur Ideal Candidate6 years of professional frontend development experience, with at least 4 years using React and TypeScript in large-scale applications. You've designed, owned, and shipped complex features that set or influence technical direction at a systems level.Deep knowledge of browser internals, runtime behavior, and network performance. Demonstrated ability to diagnose bottlenecks and deliver substantial performance improvements under demanding conditions.Expert-level understanding of JavaScript, HTML, CSS, and core browser APIs. You can write efficient, high-quality code without frameworks and understand how frameworks like React operate under the hood.Advanced knowledge of GraphQL, Apollo Client, and caching patterns. Experience designing efficient API contracts and minimizing unnecessary client-side state.Strong collaboration skills with Product Managers and UX Designers. You can translate product goals and user insights into strong technical solutions that elevate the user experience.In accordance with local employment laws, applicants must have current, valid authorisation to work at the time of application. If this sounds interesting and you'd like to learn more, click the link below to apply or email me with a copy of your CV on