Senior Mobile Engineer, iOS
Employment Information
Report this job
Job expired or something wrong with this job?
Job Description
Senior iOS Engineer building Thunderbird’s privacy-focused email application for Canadian users. Improving mobile architecture, reliability, security, and performance within an open-source ecosystem.
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 confidently make changes across the entire 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 before they escalate
- Document technical decisions, system architecture, and team processes
- Own assigned projects, collaborating cross-functionally, from investigation and planning through development, validation, and delivery
- Ensure mobile development meets accessibility, security, and privacy standards
- Collaborate with mobile engineers, product management, UX, open-source contributors, and the broader Mozilla ecosystem to deliver Thunderbird’s iOS experience
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
- 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 async written communication skills; comfortable working with a geographically distributed team
- Ability to learn, evaluate, and responsibly use emerging technologies, including AI-enabled tools, to improve work processes
- Applicants must reside in Canada and have permanent work authorization; no visa sponsorship provided
- Bonus: Familiarity with Apple App Store and Google Play Store compliance guidelines
- Bonus: Experience contributing to open-source projects or communities
- Bonus: Proficiency in French, German, Japanese, or another widely supported Thunderbird language
Benefits:
- Fully remote work & schedule flexibility
- Company-provided laptop
- Annual bonus program
- Monthly remote work stipend
- Annual professional development stipend
- Access to Coursera learning platform
- Industry conferences
- Company all-hands and team gatherings
- 24 days PTO per year (prorated)
- Your birthday
- Year-end company shutdown
- 9 wellbeing days
- Public holidays
- Other paid leave
- Quarterly wellbeing stipend for personal / family activities
- RRSP contributions
- Health, dental, & vision insurance
- Disability insurance
- Life insurance
- Employee assistance program
- Paid parental leave
- Paid sick days
Similar Jobs
Senior Software Engineer – Tools & Automation
Full-Stack Software Engineer developing automation tools for VMRay’s malware-analysis and threat-detection cybersecurity products. Administering AWS services and improving software stability, quality, and infrastructure.
Senior Software Engineer
Senior Software Engineer building Connected+ Supplier integrations for commonsku’s promotional-products SaaS platform. Streamlining purchase-order-to-invoice workflows and powering supplier partnerships.
Senior Software Developer
Senior Software Developer building AI-enabled full-stack servicing applications for Rocket Innovation Studio, a Canadian fintech company. Owning features across React, .NET, AWS, and Kubernetes from design through production operations.
Software Developer II
Software Developer II owning full-stack servicing features for Rocket Innovation Studio, a Canadian fintech company. Building, deploying, and optimizing applications used by millions of Rocket homeowners.
Senior Software Development Engineer – Iris AI
Senior engineer building AI-powered cloud services for Delinea's identity security platform. Developing LLM features, scalable backend systems, and production infrastructure on Azure and Kubernetes.
Full Stack Developer
Shopify full-stack developer building and optimizing KU2 Cosmetics’ D2C beauty stores. Integrating apps, APIs, headless setups, analytics, and CRO improvements for global customers.
Principal Software Engineer
Principal Software Engineer building scalable data ingestion, transformation, and search systems for Nebulock’s AI threat-hunting platform. Leading distributed-system architecture handling terabytes of security telemetry daily.
Software Engineer – Query Language
Software Engineer owning New Relic’s query language and gateway stack. Building scalable Java services and petabyte-scale infrastructure for its observability platform.
Associate Software Engineer
Associate Software Engineer designing and maintaining Keyfactor’s trust infrastructure software. Writing code, debugging, reviewing changes, and collaborating on Agile development with QA teams.
Senior Fullstack Software Engineer, React, Node.js, Python
Senior full-stack engineer building scalable React, Node.js, and Python applications for Nortal’s digital transformation clients. Architecting AWS cloud solutions, APIs, automated tests, infrastructure, and CI/CD pipelines for global enterprises and public-sector organizations.
Senior Full-Stack Software Engineer
Full-stack engineer building Circle’s curated marketplace for communities, courses, and memberships. Developing scalable Rails, React, and Next.js purchasing and discovery experiences.
Product Marketing Lead – Technical
Product Marketing Lead shaping launches, messaging, and sales enablement for LiveKit’s voice AI infrastructure. Positioning developer-focused voice AI products for enterprise and self-serve growth.
Senior GTM Engineer
Sr. GTM Engineer building CRM, data, and automation infrastructure for Firework’s AI video-commerce platform. Turning market data into qualified enterprise sales pipeline through automated sourcing, enrichment, scoring, and routing.
Backend Software Engineer
Backend Software Engineer building REST APIs and microservices for marketplace and eCommerce integrations. Improving synchronization, reliability and observability across high-volume customer integrations.
Senior Software Engineer, C#
Senior C# engineer developing Ethixbase 360’s compliance platform from Romania. Delivering secure, scalable .NET software with Agile teams and US-based vendors during North American hours.
Senior Software Engineer
Senior Software Engineer building AI-powered healthcare applications at Curai Health. Developing full-stack features with React, Python, AWS, and healthcare data expertise.
Senior Analyst, Software Development Engineering
Senior Analyst supporting CVS Health’s pharmacy benefit management applications with Java, Angular, APIs, and cloud platforms. Troubleshooting production issues, implementing fixes, and improving system reliability.
Senior Analyst, Software Development Engineering
Senior Analyst supporting CVS Health’s Java, Angular, API, and cloud applications. Troubleshooting production incidents and improving systems serving the pharmacy benefit management business.
Senior Engineer, Offensive Security
Senior offensive security engineer building AI-driven red-team tooling for Humana's healthcare and health-data systems. Running penetration tests, purple-team exercises, and adversarial assessments of enterprise AI.
Senior Software Engineer
Senior Software Engineer building RegScale’s security, risk, and compliance platform. Owning full-stack features across Angular, .NET, C#, Python, and SQL data layers from design through production.