Senior iOS Engineer

Why Thunderbird?

MZLA Technologies Corporation (MZLA) is a wholly-owned, for-profit subsidiary of the Mozilla Foundation and the home of Thunderbird. Thunderbird is a global, free, and open-source email and productivity app, which has experienced significant growth in revenue, staff, and aspirations since its launch 20 years ago. Our revenue comes from our dedicated users around the world who generously fund our work. As we continue to expand our team and enhance our products and services, we remain dedicated to providing best-in-class productivity solutions independent of big tech. Operating as a small but dynamic team of 40 + staff across seven countries and time zones, we are part of the larger Mozilla family but maintain our distinct and independent identity from both the Mozilla Foundation and Mozilla Corporation.

Our organizational culture is driven by our mission. We are committed to fostering openness and transparency as a member of the open-source community. We lean into collaboration, creativity, and diversity. We bring a hearty dose of scrappy grit and resilience to our lively and spirited team. Our operating principles leverage data informed decisions, ownership, speed and efficiencies to elevate our work and deliver innovative and impactful solutions to our users.

The Opportunity:

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.

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. 

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.

We’re committed to creating an amazing experience for our users, and you’ll play a key part in this effort. As part of the MZLA Mobile team you will be working with our existing staff and community members from all over the globe to support the mission and objectives of MZLA Technologies Corp and the Thunderbird Project. Additionally, you’ll have the opportunity to engage with other mobile engineers across the broader Mozilla ecosystem. 

The Sr Software Engineer, iOS is an individual contributor and will report directly to the Senior Manager, Mobile Engineering. 

This is a remote, full time position. We require strong written communication skills to facilitate effective work coordination across various virtual communication platforms such as email and video conferencing.

What you’ll do: 

• 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.

What you’ll bring: 

• 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

Bonus points for:

• Familiarity with app store guidelines (Google Play Store, Apple App Store) for ensuring compliance when preparing apps for release.
• Expertise in cross-platform frameworks like Kotlin Multiplatform or Rust
• Proficiency in Android application architecture and differences between iOS and Android development.
• Experience contributing to open-source projects or engaging with open-source communities.
• Proficiency in one of the top languages Thunderbird is translated to, such as French, German, or Japanese

What you’ll get:

We benchmark our base salaries to local markets and target the 60th percentile of the peer market. The salary ranges for this role are:

• Germany: 65,000-80,000 Euros 
  

In addition to competitive salaries, we offer a comprehensive benefits package designed to support your whole self.

Work & Career

• Fully remote work & schedule flexibility
• Latest Laptop and accessories 
• Annual Remote Work Stipend
• Monthly Internet Stipend
• Professional Development Stipend
• Industry Conferences

Rest & Play

• 24 days PTO per year (prorated) 
• Your Birthday
• Year-end Company Shutdown
• Pilot 4 Day Work Week (July & August 2024)
• Public Holidays
• Other Paid Leave
• Wellbeing Allowance for Personal / Family Activities

Health & Family

• Pension Contributions
• Health, Dental, & Vision Insurance
• Disability/Income Protection Insurance
• Life Insurance
• Employee Assistance Program 
• Paid Parental Leave
• Paid Sick Days 

*Applicants must reside in and have work authorization for the country location(s) specified above. We are unable to consider applicants outside of these markets at this time. And we are unable to provide visa sponsorship

MZLA Technologies Corporation (MZLA) Commitment to diversity, equity and inclusion

MZLA believes in the value of diverse creative practices and forms of knowledge, and knows diversity, equity and inclusion are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities and expressions.

We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose. 

We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodations@thunderbird.net to request accommodation.

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