iOS Engineer

Allegis Group; Greater London; On-site; GBP 65,000 - 95,000; Full time

Job summary

Allegis Group partners with a leading global payments and financial services organisation to hire an experienced iOS Engineer to shape mobile experiences used by millions of customers worldwide. You will join a high-performing engineering team, own features, collaborate with product managers, designers, QA, and other developers, and help evolve the iOS stack from Objective-C to modern Swift.

This role emphasizes performance, reliability, and delightful user experiences at scale in a fast-paced

Qualifications

• Proficiency in Swift; exposure to Objective-C.
• Experience with unit and integration testing.
• Knowledge of performance analysis and optimisation techniques.
• Experience with build tools and CI/CD technologies such as Tuist, xcodebuild, GitHub Actions, CircleCI.
• Familiarity with REST APIs and modern mobile architecture patterns.
• Strong problem-solving skills and the ability to thrive in an environment where innovation and experimentation are encouraged.
• Degree in Computer Science (or equivalent experience).

Responsibilities

• Developing and maintaining native iOS applications used by millions of customers globally.
• Delivering new features and continually improving existing functionality.
• Writing high-quality, maintainable code and contributing to engineering best practices.
• Investigating, debugging, and resolving production issues.
• Optimising application performance and user experience.
• Working with CI/CD pipelines and modern development tooling.
• Collaborating with globally distributed teams to solve complex business and technical challenges.
• Supporting the evolution of existing Objective-C codebases while helping drive modernisation initiatives.

Skills

Swift

Objective-C

Unit testing

Performance analysis

REST APIs

MVVM

UIKit

XCTest

XCUITest

CI/CD tooling

Problem-solving

Education

Degree in Computer Science (or equivalent)

Tools

Tuist

xcodebuild

GitHub Actions

CircleCI

Job description

We're working with one of the world's most recognised global payments and financial services organisations to find an experienced iOS Engineer to help shape mobile experiences used by tens of millions of customers worldwide.

This is an opportunity to join a high-performing engineering team building products at incredible scale, while enjoying the ownership, collaboration, and fast pace typically associated with smaller technology teams.

The Role

As an iOS Engineer, you'll work alongside product managers, designers, QA engineers, and fellow developers to build and enhance customer-facing mobile applications. We're looking for someone who loves solving complex technical problems, takes pride in writing clean and maintainable code, and is passionate about creating outstanding user experiences.

What You'll Be Doing

• Developing and maintaining native iOS applications used by millions of customers globally.
• Delivering new features and continually improving existing functionality.
• Writing high-quality, maintainable code and contributing to engineering best practices.
• Investigating, debugging, and resolving production issues.
• Optimising application performance and user experience.
• Working with CI/CD pipelines and modern development tooling.
• Collaborating with globally distributed teams to solve complex business and technical challenges.
• Supporting the evolution of existing Objective-C codebases while helping drive modernisation initiatives.

What We're Looking For

• Proficiency in Swift and exposure to Objective-C.
• Experience with unit and integration testing.
• Knowledge of performance analysis and optimisation techniques.
• Experience with build tools and CI/CD technologies such as Tuist, xcodebuild, GitHub Actions, and CircleCI.
• Familiarity with REST APIs and modern mobile architecture patterns.
• Strong problem-solving skills and the ability to thrive in an environment where innovation and experimentation are encouraged.
• Degree in Computer Science (or equivalent experience).

Swift | UIKit | MVVM | REST APIs | Objective-C | XCTest | XCUITest | GitHub Actions | CircleCI | Tuist | Micro-Features Architecture

Why Apply?

• Build products used by tens of millions of customers worldwide.
• Join a globally recognised brand at the forefront of digital payments and customer experience.
• Work within a collaborative engineering culture that values innovation, ownership, and technical excellence.
• Influence the future direction of highly visible mobile products with real-world impact.

Sponsorship not provided for this position, Applicants must have active right to work in the UK