Senior iOS Engineer, Mozilla

• The ideal candidate is a seasoned engineer who will have deep expertise in mobile application development foriOS, with experience using languages and frameworks such as Swift and SwiftUI, as well as a proven ability to optimize application performance and design scalable mobile architectures within open-source environments
• We require strong written communication skills to facilitate effective work coordination across various virtual communication platforms such as email and video conferencing
• 7+ years of professional development experience with at least 2+ years in a Senior Software Engineer role
• 3+ years of mobile development experience with native languages such as Swift and a deep understanding of mobile app architectures and patterns
• Proven ability to deliver and maintain complex software projects, ensuring quality, scalability, and reliability throughout the software development lifecycle
• Strong understanding of security practices, including data encryption, secure storage, app signing, and addressing vulnerabilities in mobile platforms
• Advanced proficiency with version control systems (e.g., Git) and experience working in a collaborative environment
• Strong attention to detail, with excellent learning and exploration skills and a product-focused mindset that looks beyond the code to consider user needs and business goals
• Deep respect for diverse skills and perspectives, with an ability to collaborate effectively across technical and non-technical teams
• Excellent English written and verbal communication skills, with the ability to clearly and concisely engage with an international, geographically distributed team

Desirable

• As a Senior Software Engineer for iOS at MZLA, you will play a key role in shaping Thunderbird’s mobile platform
• After a successful launch of Thunderbird for Android, we’re looking to expand our product portfolio to provide a mobile experience on iOS
• This position offers the opportunity to build an open-source mobile product from the ground up—we are starting from a blank slate
• This role will lead the development of Thunderbird’s mobile applications for iOS, shaping their technical direction and ensuring exceptional performance
• This role focuses on evolving the mobile platform to meet the needs of Thunderbird’s global user base
• The Sr Software Engineer, iOS is an individual contributor and will report directly to the Senior Manager, Mobile Engineering
• Build and refine Thunderbird’s mobile products and platform architecture, ensuring scalability, performance, reliability, and user-centered design
• Develop a deep understanding of the codebase and architecture to confidently make changes across the entire stack
• Develop and maintain strong debugging and testing practices, utilizing unit, integration, and automated testing frameworks to ensure software quality and reliability
• Conduct thorough code reviews and provide guidance on architectural improvements, test integration and development best practices
• Independently resolve technical challenges, including performance bottlenecks, security vulnerabilities and cross-platform integration
• Monitor application vitals and identify potential issues before they escalate
• Document technical decisions, systems architecture, and team processes to ensure transparency, maintainability, and knowledge transfer
• Own assigned projects, collaborating cross-functionally to investigate, plan, develop, validate, and deliver within established project timelines
• Work directly with users and contributors to gather information to reliably reproduce bugs and then fix them
• Ensure compliance with accessibility, security, and privacy standards in mobile development
• Leverage analytics and user feedback to inform and improve mobile user experiences
• Mentor and guide community contributors, enabling their active participation and long-term involvement in our efforts