IOS Developer

iO Sphere; Bristol; Hybrid; GBP 90,000 - 110,000; Full time

Job summary

A leading technology firm is seeking a Lead iOS Software Engineer to drive the development of high-quality iOS applications. In this role, you will collaborate closely with cross-functional teams to create robust and scalable features. The ideal candidate will possess extensive experience in Swift and SwiftUI, along with a strong understanding of MVC architecture and networking. The position offers a competitive salary of £90,440 - £110,000 and a flexible hybrid working arrangement.

Qualifications

• Strong knowledge of networking with URLSession and Codable.
• Hands-on experience with GCD and Operation Queues.
• Expertise in localization best practices.

Responsibilities

• Design, develop, and maintain iOS applications using Swift and SwiftUI.
• Collaborate with product, design, and engineering teams.
• Conduct code reviews and mentor junior developers.

Skills

Swift

SwiftUI

MVC/MVVM-C architecture

Networking (URLSession, Codable)

Database Management

Background Task Handling

Unit Testing (XCTest, XCUITest)

Debugging Tools (Instruments, Xcode Organizer)

Biometric/Multi-factor Authentication

CI/CD tools (GitHub Actions, Fastlane)

Tools

Xcode

Firebase Crashlytics

GitHub Copilot

SAST/DAST tools

Job description

Lead iOS Software Engineer

Salary: £90,440 - £110,000. Location: Bristol. Hours: Full-time. Working pattern: Two days per week (or 40% of your time) at our Bristol office.

Overview: An exciting opportunity to lead iOS development and deliver high‑quality experiences that meet user needs and business goals.

Responsibilities

• Design, develop, and maintain iOS applications using Swift and SwiftUI.
• Collaborate with product, design, and engineering teams to deliver high‑quality features.
• Ensure application performance, scalability, security, and reliability.
• Identify, design, and implement reusable components.
• Troubleshoot and resolve complex bugs, integration issues, and performance bottlenecks.
• Conduct code reviews and mentor junior developers.
• Handle App Store distribution, beta releases, and CI/CD processes.
• Utilize Xcode and GitHub Copilot to streamline development and testing workflows.

Qualifications

• Strong understanding of MVC/MVVM-C architecture patterns.
• Proficient in Swift and SwiftUI.
• Strong knowledge of networking (URLSession, Codable).
• Experience working with databases: Swift Data, Core Data, SQLite, and caching mechanisms.
• Expertise in background task handling using Background Modes.
• Hands‑on experience with GCD, Operation Queues, and PromiseKit.
• Unit testing experience: XCTest, XCUITest, Snapshot testing.
• Strong understanding of reactive programming – SwiftUI with Swift Concurrency.
• Localization best practices and country‑specific rollout with configuration files.
• Proficiency with debugging tools: Instruments, Xcode Organizer, log management.
• Keychain, data encryption, SSL/certificate pinning.
• Biometric and multi‑factor authentication implementation.
• Experience with Firebase Crashlytics, custom analytics, and remote configuration.
• Experience with CI/CD tools such as GitHub Actions or Fastlane.
• Familiarity with SAST/DAST tools (nice to have).
• Knowledge of re‑platforming assessments for mobile applications.
• Ability to architect mobile solutions and provide technical direction across multiple technologies.