Senior iOS Engineer (6-Month Contract, Outside IR35)

Contract Type: 6-Month Contract (Outside IR35)

Rate: £300 per day

Location: London, Greater London, United Kingdom

Working Arrangement: Fully Remote (UK/EU-based candidates only)

We’re looking for a seasoned Senior iOS Engineer with a strong command of modern Swift development to join a mature consultancy organisation for a key product delivery initiative. This is a six-month contract role designed to accelerate the rollout of a strategic product within an established iOS team. You’ll play a critical role in balancing innovation with the realities of legacy systems, focusing on delivery while maintaining a clear product-led mindset. The ideal candidate will have deep expertise in native iOS development, particularly across both modern and legacy codebases. You’ll bring a pragmatic yet forward-thinking approach, be an effective communicator capable of liaising with a range of stakeholders, and be confident managing technical debt while implementing robust, scalable solutions.

Core Skills & Experience

* Strong foundation in native iOS development with experience working across modern and legacy codebases

* Proficient with Swift, including building and maintaining features in both UIKit and SwiftUI

* Hands-on experience with RxSwift and maintaining/refactoring reactive codebases

* Working knowledge of Swift Concurrency, including Combine, async/await, and integrating with RxSwift

* Understanding of architectural patterns such as MVVM, MVI and MVP

* Experience writing and maintaining unit tests, UI tests, and snapshot tests

* Exposure to CI/CD pipelines, with familiarity in CircleCI preferred

* Solid grasp of mobile performance tuning and optimisation best practices

* Excellent communication skills, adaptable to technical and non-technical audiences across internal and external teams

Nice-to-Have Skills

* Advanced experience with RxSwift & RxCocoa in production environments

* Understanding of unidirectional data flow architecture

* Comfort working with video player SDKs such as Brightcove, Ooyala, or similar platforms

* Previous experience in modernising and refactoring legacy codebases into modern Swift architectures T

his is a fantastic opportunity to contribute to an impactful project with clear goals, within a collaborative consultancy setting. If you’re confident in delivering reliable and maintainable iOS solutions and enjoy working autonomously within a skilled and supportive remote team, we’d love to hear from you.