Senior iOS Engineer - Global Tech

Principle HR • TRAFFIC • Remote (London, Not Specified, United Kingdom) • 12h ago

Senior iOS Engineer - Remote UK - 6-Month Contract (Inside IR35)
A rare opportunity to work behind the scenes on some of the most widely used mobile experiences-where your code quietly powers design systems used across multiple apps.
We're hiring a Senior iOS Engineer to join a high-impact mobile infra team focused on building a shared design system used across login, account, and verification surfaces-including GenAI integrations. The team owns reusable UI components that deliver consistency, performance, and scalability across mobile platforms.
The Offer

Annual Salary from £98,000-£110,000, depending on location and experience
6-month contract, inside IR35, PAYE - paid weekly through us, PrincipleHR
Fully remote within the UK - must reside in the UK for the duration (no sponsorships)
Join a mature, high-tenure team delivering on priority mobile projects

What You'll Bring

7+ years' experience in iOS development (Swift/Obj-C)
Proficiency in PHP (used to support UI infra logic)
Experience building scalable mobile UI components and design systems
Comfortable working cross-functionally in fast-paced, ambiguous environments
Bonus: React or design system experience at scale

What You'll Do

Build and maintain shared UI components across mobile apps
Contribute to ongoing infra migrations and quality checks
Collaborate with designers, PMs, and infra teams across the org
Occasionally support on-call rotation (optional if preferred)

You'll be part of a small, London-based team (fully remote in the UK), working across foundational systems with engineers who've helped build some of the most recognised mobile frameworks in the industry.
Interested? If you're passionate about iOS, infra, and design systems-and you want your work to quietly scale to millions-get in touch to learn more.
Apply Now for immediate consideration. Som

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