Senior iOS Engineer (Contract) | Swift, UIKit, MVVM, Snapshot Testing, ActivityKit | High-Traffic Consumer App | £400/day | Remote (UK) | 6-Month initial Contract, Likely extensions | Outside IR35
Posted 1 day ago by Owen Thomas | B Corp™
£400 Per day
Outside
Remote
United Kingdom
Summary: The Senior iOS Engineer (Contract) role involves joining a cross-functional product team to enhance a high-traffic consumer app. The position emphasizes engineering excellence, mentoring, and delivering production-grade features. This hands-on role requires strong technical influence and collaboration with stakeholders. The contract is for an initial 6 months with potential extensions, and it is classified as outside IR35.
Key Responsibilities:
- Contribute to the delivery of new features within a high-traffic mobile application
- Work closely with product owners and stakeholders to shape solutions
- Build and maintain scalable, high-performance iOS applications
- Write clean, well-tested, and maintainable code aligned with best practices
- Participate in architectural discussions and technical decision-making
- Conduct thorough code reviews and uphold engineering standards
- Mentor and support other engineers within the team
- Drive continuous improvement across code quality, performance, and processes
Key Skills:
- Strong, recent experience with native iOS development in production environments using Swift
- Building complex UI using UIKit (programmatically, no Storyboards/XIBs)
- iOS architectural patterns (MVVM + Coordinators)
- Performance optimisation and profiling (memory, responsiveness)
- Automated testing: Unit testing (XCTest / Swift Testing), UI testing (XCUITest), Snapshot testing
- CI/CD pipelines and build tooling (e.g. CircleCI, Fastlane)
- Dependency management (SPM, CocoaPods)
- Strong understanding of SOLID principles and scalable architecture
- Clear communication with both technical and non-technical stakeholders
- Nice to Have: Experience with Live Activities / ActivityKit / Dynamic Island Widget development using WidgetKit
- Exposure to Objective-C codebases
- Experience working with or alongside React Native
- Previous experience mentoring engineers or leading technical initiatives
Salary (Rate): £400/day
City: undetermined
Country: United Kingdom
Working Arrangements: remote
IR35 Status: outside IR35
Seniority Level: Senior
Industry: IT
We’re hiring a Senior iOS Engineer (contractor) to join a cross-functional product team delivering high-quality mobile experiences for a widely used, consumer-facing platform. You’ll be joining a collaborative, quality-driven environment where engineering excellence, performance, and user experience are taken seriously. This is a 6-month initial contract , ideal for senior engineers who enjoy owning technical decisions, mentoring others, and shipping production-grade features in complex environments.
The Role | Senior iOS Engineer (Contract) | Swift, UIKit, MVVM, Snapshot Testing, ActivityKit | High-Traffic Consumer App | £400/day | Remote (UK) | 6-Month initial Contract, Likely extensions | Outside IR35
This is a hands-on senior role with strong influence across both delivery and technical direction. You’ll be expected to:
- Contribute to the delivery of new features within a high-traffic mobile application
- Work closely with product owners and stakeholders to shape solutions
- Build and maintain scalable, high-performance iOS applications
- Write clean, well-tested, and maintainable code aligned with best practices
- Participate in architectural discussions and technical decision-making
- Conduct thorough code reviews and uphold engineering standards
- Mentor and support other engineers within the team
- Drive continuous improvement across code quality, performance, and processes
This role suits engineers who take pride in craftsmanship, enjoy mentoring, and thrive in collaborative, product-led teams.
Senior iOS Engineer (Contract) | Swift, UIKit, MVVM, Snapshot Testing, ActivityKit | High-Traffic Consumer App | £400/day | Remote (UK) | 6-Month initial Contract, Likely extensions | Outside IR35
Strong, recent experience with:
- Native iOS development in production environments using Swift
- Building complex UI using UIKit (programmatically, no Storyboards/XIBs)
- iOS architectural patterns (MVVM + Coordinators)
- Performance optimisation and profiling (memory, responsiveness)
- Automated testing: Unit testing (XCTest / Swift Testing)
- UI testing (XCUITest)
- Snapshot testing (e.g. Point-Free SnapshotTesting or similar)
- CI/CD pipelines and build tooling (e.g. CircleCI, Fastlane)
- Dependency management (SPM, CocoaPods)
- Strong understanding of SOLID principles and scalable architecture
- Clear communication with both technical and non-technical stakeholders
Nice to Have
- Experience with Live Activities / ActivityKit / Dynamic Island Widget development using WidgetKit
- Exposure to Objective-C codebases
- Experience working with or alongside React Native
- Previous experience mentoring engineers or leading technical initiatives
Why This Contract Stands Out | Senior iOS Engineer (Contract) | Swift, UIKit, MVVM, Snapshot Testing, ActivityKit | High-Traffic Consumer App | £400/day | Remote (UK) | 6-Month initial Contract, Likely extensions | Outside IR35
£400 per day
Fully remote (UK/EU-based contractors welcome)
Outside IR35
High-impact work on a widely used consumer product
Strong engineering culture with a focus on quality and performance
Opportunity to influence technical direction, not just deliver tickets
Collaborative, cross-functional team environment
Clear scope with meaningful delivery outcomes over 6 months, likely extensions
This is not a greenfield rebuild - it’s a high-quality engineering environment where you’ll work on a real product at scale, contribute to technical decisions, and help shape the evolution of a mature iOS platform.
Please apply HERE and WE will be in touch if it looks like a strong match.
Senior iOS Engineer (Contract) | Swift, UIKit, MVVM, Snapshot Testing, ActivityKit | High-Traffic Consumer App | £400/day | Remote (UK) | 6-Month initial Contract, Likely extensions | Outside IR35