Senior iOS Engineer — Global-Scale, Security‑Focused

Experis; Watford; On-site; GBP 70,000 - 110,000; Full time

Job summary

Experis is seeking a Senior iOS Developer to join a leading cyber software client. You will be a hands-on engineer across the full lifecycle, from feature design to App Store release, collaborating with product, engineering, and QA teams to deliver secure, high-quality mobile experiences.

You will design, develop, and deliver features for iOS at global scale, lead custom iOS features, and work with cross-functional teams to ensure quality and security.

Qualifications

• Proven experience as an iOS Developer with shipped production apps.
• Strong knowledge of Swift, Objective‑C, and the iOS SDK.
• Experience with modern iOS architectures (e.g. MVVM, Clean Architecture).
• Solid understanding of CS fundamentals, including algorithms and data structures.
• Knowledge of mobile security, performance optimization, and Apple HIG.
• Experience with Xcode, TestFlight, App Store Connect, Git, CI, Jira, and Confluence.
• A proactive, problem‑solving mindset and ability to thrive in a fast‑moving environment.

Responsibilities

• Design, develop, and deliver new features iOS applications at global scale.
• Lead the implementation of custom iOS features.
• Collaborate with Product Managers, Tech Leads, and QA to plan, build, and ship features.
• Ensure high standards of quality, performance, and security.
• Debug, track, and resolve defects; contribute to L3 support when required.
• Help drive innovation within the iOS platform and development practices.

Skills

Swift

Objective-C

iOS SDK

MVVM

Clean Architecture

CS fundamentals

mobile security

performance optimization

Apple HIG

Xcode

TestFlight

App Store Connect

Git

CI

Jira

Confluence

Tools

Xcode

TestFlight

App Store Connect

Git

CI

Jira

Confluence

Job description

Experis is seeking a Senior iOS Developer to join a leading cyber software client. You will be a hands-on engineer across the full lifecycle, from feature design to App Store release, collaborating with product, engineering, and QA teams to deliver secure, high-quality mobile experiences.

You will design, develop, and deliver features for iOS at global scale, lead custom iOS features, and work with cross-functional teams to ensure quality and security.