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JSG (Johnson Service Group, Inc.)

Senior iOS Mobile Engineer (124)

  • Toronto, ON, Canada

Contract

This opening has closed.

The original listing is kept below for reference.

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Job details

Job type
Contract
Closing date
Experience
9–10 years of hands-on iOS application development experience.
Posting language
English
Posted

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Original job description

Archived listing. The details below describe a past opening.

Johnson Service Group (JSG) is currently looking for a Senior iOS Mobile Engineer with 9–10 years of hands-on iOS development experience and strong expertise in Swift and the Apple ecosystem. Our client is seeking a Senior iOS Mobile Engineer to design, develop, and maintain scalable, high-performing, and user-centric iOS applications and features. (Toronto, Hybrid, 2 days in office/wk)

Must Have Skills

  • 9–10 years of hands-on iOS application development experience.
  • Strong proficiency in Swift, including protocols, generics, and functional programming concepts.
  • Experience building applications using SwiftUI and modern iOS frameworks.
  • Expertise with Xcode for development, debugging, performance optimization, and profiling.
  • Experience integrating REST APIs, GraphQL, JSON, and third-party services.
  • Knowledge of CoreData, Keychain, and UserDefaults for data persistence.
  • Experience with XCTest, XCUI, and Test-Driven Development (TDD).
  • Strong Git-based source control and collaborative development practices.
  • Experience using Xcode Instruments and Memory Graph to analyze and optimize application performance.
  • Strong understanding of MVC, MVVM, and Clean Architecture design patterns.
  • Excellent problem-solving, debugging, and troubleshooting skills.
  • Proven ability to work independently with strong ownership and accountability.

Nice to Have Skills

  • Backend development experience.
  • Passion for learning and adopting emerging iOS technologies.

Responsibilities

  • Design, develop, and maintain high-quality iOS applications and new features.
  • Collaborate with product managers, designers, QA engineers, and fellow developers to deliver exceptional user experiences.
  • Translate business requirements into scalable, maintainable technical solutions.
  • Work effectively with cross-functional teams while managing dependencies and resolving technical challenges independently.
  • Participate in code reviews and contribute to engineering best practices.
  • Identify, troubleshoot, and resolve application performance, stability, and usability issues.
  • Continuously improve application quality, performance, and maintainability.

Johnson Service Group (JSG) is an Equal Opportunity Employer. JSG provides equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, age, sexual orientation, gender identity, national origin, disability, marital status, protected veteran status, or any other characteristic protected by law.

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More about this job

Responsibilities

Design, develop, and maintain scalable, high-performing iOS applications and features, translating business requirements into maintainable technical solutions. Collaborate with cross-functional teams, contribute to code reviews and engineering practices, and resolve performance, stability, and usability issues.

Requirements

Requires 9–10 years of hands-on iOS development experience and strong Swift expertise, including SwiftUI, modern iOS frameworks, architecture patterns, and API integration. Candidates should also have experience with persistence, testing, Git, performance profiling, and independent problem-solving.

Skills

  • Swift
  • iOS Development
  • SwiftUI
  • Xcode
  • REST APIs
  • GraphQL
  • JSON
  • Core Data
  • Keychain
  • UserDefaults
  • XCTest
  • XCUI
  • Test-Driven Development
  • Git
  • Xcode Instruments
  • MVVM

Visa sponsorship

Not detected in the job text

Categories

  • Software
  • Technology
  • Engineering

Keywords

  • iOS
  • Swift
  • SwiftUI
  • Apple Ecosystem
  • Xcode
  • REST APIs
  • GraphQL
  • JSON
  • Third-Party Services
  • Core Data
  • Keychain
  • UserDefaults
  • XCTest
  • XCUI
  • Test-Driven Development
  • Git
  • Xcode Instruments
  • Memory Graph
  • MVC
  • MVVM
  • Clean Architecture
  • Performance Optimization
  • Debugging
  • Application Development
  • Backend Development

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