Lead iOS Developer

About Us

Join Proton and build a better internet where privacy is the default

Proton was founded in 2014 by scientists from CERN on a simple truth: privacy is a fundamental human right. Since then weve built the worlds largest encrypted email service (Proton Mail) and expanded into Proton VPN Proton Drive Proton Pass and Proton Calendartools used by millions globally to protect their freedom fight censorship and keep their data some situations Proton has literally helped save lives!

We are profitable independent (no VC control) and selectively hire from the top 1% of applicants. Our 500 team members across 50 countries come from leading organizations and elite academic backgrounds. We move fast keep hierarchy light and prioritize impact over optics. If you want to do meaningful work with exceptionally high-caliber people this is us and do work you can truly be proud ouropen-sourceprojectshere!

About Photos

Join the team building Proton Drive Photos a private photo storage designed so your memories belong only to you. Were creating the encrypted alternative to Big Tech photo platforms combining consumer-grade UX with uncompromising privacy. If you want to build products used by millions while helping fix the internet wed love to meet you.

The Role

As an engineer on our Apple team youll build and ship features across Protons apps on iPhone iPad and macOS working closely with product and engineers across the company to define what great looks like on Apple platforms. Our codebase is primarily Swift with some Go and were moving to a platform-independent Rust logical core that communicates with Swift via a generic interface so Rust experience is a strong plus. Quality is central to the role: youll contribute to and maintain our testing stack including unit tests for business logic stubbed API tests for pseudo-integration snapshot tests for UI and XCUITest for end-to-end user flows. Youll join a team that pairs deep technical expertise with an obsession for simple usable interfaces shipping privacy-preserving products used by millions.

What we are looking for:

• You have experience in iOS in particular with Swift
• You have a passion for mentoring other engineers and helping them grow
• You are passionate about user interaction usability and providing an excellent user experience
• Demonstrated experience driving change within an organisation and leading complex technical projects
• Extensive experience building maintainable and testable code bases including API design and unit testing techniques
• Extensive experience with concurrent programming and mobile memory management
• A strong grasp of scalable software architecture and software engineering best practices
• An intuition for optimal user experience and design
• Rust experience not required but a major plus
• Deep understanding ofAPNs UNUserNotificationCenter and iOS background execution(silent pushes background app refresh background URLSession) and how these impact app reliability
• Experience buildingoffline-first data flowswith local persistence (Core Data SQLite Realm or similar) and conflict-free sync

What we offer

• Work that Matters:millions of people trust Proton with their privacy. We answer only to our users not advertisers not investors with conflicting agendas not governments. The work you do here is real and the impact is measurable. (read more about our impact here)
• A great Team: Our team is diverse collaborative and tight-knit with people coming from all walks of life including many of the worlds top academic institutions and organizations such as MIT Harvard Stanford Caltech Cambridge and ETH.
• Technology:youll get the right hardware and the right software you need to do your best work.
• Learning & Development:we invest in your growth because sharp people make us better. Proton is one of the fastest ways to accelerate your career because youll be thrown into real challenges with real ownership from day one.
• Employee Benefits:your wellbeing isnt an afterthought. We offer strong health coverage solid retirement options generous leave and wellness support so you can bring your best self to work every day
• Stock Options:at Proton we all have the opportunity to be owners of the company. From day one you have a real stake in what were building. When Proton wins you win.
• In-Person Collaboration: Amazing things happen when passionate smart and purposeful people get together in the same room. With offices across Geneva Zürich Barcelona London and more youll spend most of your time collaborating face-to-face with people who genuinely care about what theyre building
• Food:Lunch and snacks are on us every day in our offices so you can focus on the work and not on whats for lunch.
• Transport:getting to the office shouldnt cost you. We cover public transport bike allowances or parking whichever works for you.
• Flexible Working:you own your schedule. Set hours that work for you and your team because outcomes matter more than when the clock says you started.

Our commitment to diversity and inclusion

At Proton we believe diversity drives innovation and strengthens our mission to provide privacy as a default for all. We are committed to fostering an inclusive environment where all individuals regardless of race ethnicity gender age sexual orientation physical ability or socio-economic background feel valued and empowered. We strive to create equal opportunities promote open dialogue and support continuous learning to ensure every voice is heard and respected.

If you need any extra support or reasonable adjustments during the hiring process please let your talent partner know.

Candidate privacy notice

When you apply for a position refer a candidate or are considered for a role at Proton Technologies AG (Proton we us or our) your information is stored in Greenhouse in accordance with itsService Privacy Policy. This information is used to evaluate your suitability for the posted position. We also retain this information for consideration for future roles that you may apply for or that we believe may align with your background and skills.

If we no longer have a legitimate business need to process your information we will either delete or anonymise it. Should you have any inquiries about how we use or manage your information or if you wish to access correct or delete your data please contact our privacy team at .

Proton does not accept unsolicited CVs from any sources other than directly from candidates. We will not pay a fee for any placement resulting from an unsolicited offer even if the candidate is subsequently hired by Proton.

To learn more about our privacy policy please visitour privacy policy page.