Senior iOS Engineer: Global-Scale, Security‑Focused Apps

Experis; Belfast City District; On-site; GBP 65,000 - 95,000; Full time

Job summary

Experis is seeking a Senior iOS Developer to join a leading cyber software client to build and evolve iOS applications. You’ll be hands-on, working across the full development lifecycle—from design to App Store release—collaborating with product, engineering, and QA teams to deliver secure, high-quality mobile experiences.

You’ll bring proven experience shipping production iOS apps, strong Swift and Objective-C, familiarity with MVVM or Clean Architecture, and knowledge of security, performance,

Qualifications

• Proven experience shipping production iOS apps.
• Strong knowledge of Swift and Objective-C and the iOS SDK.
• Experience with modern iOS architectures (MVVM, Clean Architecture).

Responsibilities

• Design, develop, and deliver new features for 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

Security

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 to build and evolve iOS applications. You’ll be hands-on, working across the full development lifecycle—from design to App Store release—collaborating with product, engineering, and QA teams to deliver secure, high-quality mobile experiences.

You’ll bring proven experience shipping production iOS apps, strong Swift and Objective-C, familiarity with MVVM or Clean Architecture, and knowledge of security, performance,