IOS Engineer (Mobile Security)

📍 Location: Hybrid - 2 days per week onsite (UK)

📅 Contract Length: 6 Months

💰 Day Rate: £300-£400 per day

The Opportunity

We're looking for an experienced iOS Engineer to join a high-performing Mobile Security team within a major banking environment. This team is responsible for delivering security capabilities across the mobile channel, providing a suite of security components and services that help protect mobile applications at scale.

You will play a key role in developing and enhancing security-focused mobile solutions, collaborating with engineering teams across the organisation to ensure mobile applications remain secure, scalable, and resilient against evolving threats.

This is an excellent opportunity for an engineer who enjoys building reusable mobile frameworks, SDKs, and high-quality iOS applications within a modern engineering environment.

Responsibilities

• Design, develop, and maintain high-quality iOS applications, frameworks, and SDKs using Swift.
• Contribute to the development of reusable security components used across multiple mobile applications.
• Build scalable, modular solutions using modern architectural patterns such as MVVM.
• Collaborate with engineering teams to promote code reuse, improve developer experience, and reduce technical debt.
• Advocate engineering best practices including TDD, code reviews, pair programming, continuous integration, and automated testing.
• Ensure solutions are performant, maintainable, and thread-safe using modern Swift concurrency patterns.
• Partner with cross-functional teams to deliver secure and reliable mobile experiences.
• Support the continuous improvement of development processes, tooling, and application security standards.

Essential Skills & Experience

• Strong commercial experience developing iOS applications using Swift .
• Hands-on experience with:
• Xcode
• Git
• GitHub
• XCTest
• XCUITest
• Strong understanding of modular application architecture and frameworks-based modularisation.
• Experience implementing architectural patterns such as MVVM .
• Proven experience building, maintaining, and integrating reusable SDKs .
• Strong understanding of Swift concurrency, including:
• Async/Await
• Grand Central Dispatch (GCD)
• Operations
• Experience delivering production-scale iOS applications within Agile environments.
• Excellent communication and stakeholder management skills.
• Strong advocate of engineering excellence and software craftsmanship.

Desirable Experience

• Knowledge of mobile application security principles and best practices.
• Experience with:
• Secure storage
• Authentication and authorisation flows
• Secure handling of sensitive data
• Exposure to mobile security services such as penetration testing and application hardening.
• Experience with mobile CI/CD tooling including:
• GitHub Actions
• Fastlane
• Automated build and deployment pipelines
• Previous experience within Financial Services or other highly regulated environments.

Why Apply?

• Join a team focused on securing mobile applications used by millions of customers.
• Work on large-scale, enterprise-grade mobile platforms.
• Collaborate with talented engineers driving modern mobile engineering practices.
• Hybrid working model with a strong engineering culture.
• Competitive day rate and immediate contract opportunity.