# Senior Mobile Engineer, iOS

**Company:** [Mozilla](https://hotfix.jobs/companies/mozilla)
**Location:** Remote
**Role:** iOS Engineering
**Salary:** $123k – $144k/yr
**Experience:** 7+ years
**Skills:** Swift, SwiftUI, iOS, ios frameworks, Git, mobile security, encryption, secure storage, app signing, unit testing, integration testing, automated testing, imap, pop, matrix
**Posted:** 2026-08-06

> Build and evolve Thunderbird’s iOS application, focusing on architecture, performance, reliability, security, accessibility, and maintainability. The role requires deep Swift and iOS expertise, 7+ years of professional software development experience, and strong ownership and collaboration skills.

## Job Description

## 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.

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