Senior iOS Developer – Design Systems & Infra
Posted 2 weeks ago by Principle
£110,000 Per year
Inside
Remote
London Area, United Kingdom
Summary: The role of Senior iOS Engineer involves developing and maintaining a mobile design system for high-scale applications, focusing on UI infrastructure that supports various functionalities. The position requires hands-on experience in building native components and integrating with backend systems. The contract is fully remote within the UK and is classified as inside IR35. Candidates must have significant iOS experience and a strong knowledge of PHP.
Key Responsibilities:
- Building new iOS UI components (sticky headers, tabbed views, carousels).
- Supporting design system migrations and QA.
- Writing and integrating with PHP based UI infrastructure.
- Partnering with designers and PMs on experiments and new screen types.
Key Skills:
- 7+ years of iOS experience (Swift/Objective-C).
- Strong working knowledge of PHP (essential).
- Experience in React is a plus.
- Infra or design system experience in Big Tech or scaled product orgs.
Salary (Rate): £110,000.00 yearly
City: London Area
Country: United Kingdom
Working Arrangements: remote
IR35 Status: inside IR35
Seniority Level: Senior
Industry: IT
Senior iOS Engineer – Design Systems & Infra | Remote UK | Contract
We're hiring a Senior iOS Engineer / iOS Developer to join a team building the mobile design system used across multiple high-scale apps. You’ll be working on UI infra that powers login, account, and GenAI surfaces—driving both new component development and key system migrations. This is hands-on iOS engineering: building native components, supporting legacy infra, and integrating with backend PHP/Hack systems that power visual UI across the app.
Contract details:
Annual Salary up to £110,000 depending on location and experience
6 months, fully remote in the UK
Inside IR35, weekly PAYE
Candidate to be considered for this opportunity MUST be in the UK with an appropriate visa - no sponsorship provided.
You’ll bring:
- 7+ years of iOS experience (Swift/Objective-C)
- Strong working knowledge of PHP (essential)
- Experience in React is a plus
- Infra or design system experience in Big Tech or scaled product orgs
What you'll be doing:
- Building new iOS UI components (sticky headers, tabbed views, carousels)
- Supporting design system migrations and QA
- Writing and integrating with PHP based UI infrastructure
- Partnering with designers and PMs on experiments and new screen types
Interested? If you’ve worked in high-scale mobile teams and want to contribute to core infrastructure—not just features—get in touch. For more info, send in your CV or LinkedIn profile by clicking Apply Now.
Som | som@principlehr.com