Senior Mobile Engineer, iOS

About the role

Mozilla is looking for a Senior Mobile Engineer with deep iOS expertise to contribute to their open-source mission. This role involves designing and building mobile applications that serve millions of users worldwide. The position is fully remote, allowing you to work from anywhere while collaborating with a global team of engineers. As a senior contributor, you will take ownership of key features, mentor junior team members, and shape the technical direction of mobile products within the Mozilla ecosystem.

Key facts

What you'll do

• Architect and develop iOS applications using modern frameworks and best practices for the Mozilla ecosystem.
• Write clean, maintainable, and well-tested code for mobile features and supporting services.
• Collaborate closely with product managers and designers to define technical approaches and trade-offs.
• Review peer code thoroughly and provide constructive feedback to improve overall quality.
• Debug and resolve complex technical issues in existing mobile codebases efficiently.
• Participate in on-call rotation schedules to provide support for production applications.
• Contribute to internal tools and infrastructure that improve team productivity and workflow.
• Evaluate new technologies and recommend meaningful improvements to the mobile development stack.
• Document architectural decisions and detailed technical specifications for future reference and onboarding.
• Mentor mid-level and junior engineers through pair programming, code reviews, and guidance.
• Optimize application performance and memory usage to ensure smooth and responsive user experiences.
• Engage with the open-source community to gather feedback and prioritize feature requests.
• Participate in sprint planning and backlog grooming sessions with the broader engineering team.
• Ensure accessibility standards are met across all mobile applications and features.
• Collaborate with QA engineers to identify and address testing gaps in mobile features.
• Support the integration of new SDKs and third-party libraries into existing iOS codebases.
• Write comprehensive technical documentation and API references for internal and external consumers.

Requirements

• Proven experience building iOS applications using both Swift and Objective-C programming languages.
• Strong understanding of UIKit, SwiftUI, and the complete iOS application lifecycle.
• Hands-on experience with RESTful APIs and integrating backend services into mobile applications.
• Familiarity with distributed version control systems, particularly Git-based collaboration and branching workflows.
• Ability to work independently and communicate effectively in a fully remote setting.
• A bachelor's degree in computer science or equivalent practical experience in software development.
• Several years of professional software development experience focused on mobile platforms.
• Comfortable with the full software development lifecycle from initial design through deployment.
• Experience with continuous integration and automated testing pipelines for mobile applications.
• Solid grasp of data structures, algorithms, and object-oriented design principles and patterns.
• Experience with mobile analytics platforms and performance monitoring tools for iOS.
• Knowledge of app store submission processes and Apple developer program requirements.
• Demonstrated ability to communicate technical concepts clearly to non-technical stakeholders.

Nice to have

• Experience contributing to or using Mozilla's mobile applications and related tools.
• Knowledge of CI/CD pipelines and automated testing frameworks specifically for iOS.
• Familiarity with cross-platform mobile frameworks like React Native or Flutter.
• Background in open-source contributions or community-driven software projects and initiatives.
• Understanding of mobile security best practices and data privacy compliance standards.
• Experience with performance profiling tools and memory analysis for mobile applications.

Skills & tools

• Swift programming language for iOS application development, maintenance, and troubleshooting.
• Xcode and the full Apple developer tools suite for building and debugging.
• Git for source code management and collaborative team-based development workflows.
• REST APIs and JSON parsing for reliable backend service communication.
• Unit testing frameworks including XCTest and related automated testing tools.
• Agile or Scrum methodologies for iterative project management and delivery.

Practical notes

• This is a full-time remote position with no fixed office requirement or location mandate.
• Candidates should have reliable high-speed internet access and a dedicated workspace at home.
• The hiring process includes technical interviews, a practical coding exercise, and team discussions.
• Mozilla is an equal opportunity employer committed to diversity, inclusion, and accessibility.
• Benefits include comprehensive health coverage, retirement plans, and generous paid time off policies.
• Remote team members are expected to maintain regular communication through video calls and messaging platforms.