Senior Mobile Engineer, iOS

Responsibilities

• Build and refine Thunderbird’s mobile products and platform architecture.
• Improve scalability, performance, reliability, and user experience.
• Develop a deep understanding of the codebase and architecture to make changes across the stack.
• Maintain strong debugging and testing practices across unit, integration, and automated testing.
• Review code and guide improvements to architecture, testing, and development best practices.
• Independently resolve complex issues involving performance, security, and cross-platform integration.
• Monitor application health and address issues proactively.
• Document technical decisions, system architecture, and team processes.
• Own assigned projects from investigation and planning through development, validation, and delivery, collaborating cross-functionally.
• Ensure mobile development meets accessibility, security, and privacy standards.

Requirements

• 7+ years of professional software development experience, including 2+ years in a Senior Software Engineer role.
• 3+ years of professional mobile application development experience.
• Strong experience with Swift, SwiftUI, and iOS frameworks.
• Deep knowledge of iOS architecture, design patterns, and performance optimization.
• Experience delivering and maintaining complex, scalable, and reliable software.
• Experience addressing technical debt and refactoring large or complex codebases.
• Strong knowledge of mobile security, including encryption, secure storage, app signing, and vulnerability remediation.
• Experience with communication and email protocols such as RSS, IMAP, POP, or Matrix, and familiarity with IETF standards for CalDAV or CardDAV.
• Advanced proficiency with Git and collaborative development workflows.
• Strong debugging, testing, and problem-solving skills.
• Ability to work independently, take ownership, and collaborate across teams.
• Excellent asynchronous written communication skills; comfortable working with a geographically distributed team.
• Ability to learn, evaluate, and responsibly use emerging technologies, including AI-enabled tools.

Nice-to-haves

• Familiarity with Apple App Store and Google Play Store compliance guidelines.
• Experience contributing to open-source projects or communities.
• Proficiency in French, German, Japanese, or another widely supported Thunderbird language.

Compensation and benefits

• US base salary: $123,000–$144,000 USD.
• Fully remote work and schedule flexibility.
• Company-provided laptop.
• Annual bonus program.
• Monthly remote work stipend.
• Annual professional development stipend.
• Access to Coursera and industry conferences.
• 24 days of PTO per year, birthday leave, year-end company shutdown, wellbeing days, public holidays, and other paid leave.
• Quarterly wellbeing stipend.
• 401(k) contributions.
• Health, dental, and vision insurance.
• Disability and life insurance.
• Employee assistance program.
• Paid parental leave and paid sick days.