iOS Engineer Location: UK - Remote Contract Length: 6 months (Start: October 2025)Rate: Up to £350 per day PAYE Join our client''s Mobile team and help build the design systems powering the most visible surfaces across platforms - from AI and Account Center to Login and Verified. We''re seeking a Senior iOS Engineer with experience in PHP/Hack to support the Cross Design System - a scalable, high-quality UI infrastructure used across the Family of Apps (FoA). You''ll build native UI components, drive migrations, and shape the look and feel of products seen by millions of users daily. This is a unique opportunity to collaborate across product and infrastructure teams, working on some of Meta''s most strategic initiatives including GenAI and Accounts.What You''ll Do:Build new UI components for iOS using native frameworks, PHP/Hack, and ReactMigrate Legacy components and ensure quality and consistency across appsWork closely with PMs, designers, and partner engineers to scale and evolve XMDSSupport and optimize features such as sticky headers, animated carousels, and dynamic dialogsParticipate in experimentation and performance tuningOccasional on-call (1 in every 6 weeks during normal hours, optional for contractors)Required Skills:7+ years of experience building high-quality native iOS applicationsStrong experience in PHP/Hack for Back End component integrationSolid knowledge of React and Front End development best practicesProven track record in building scalable design ..... full job details .....