USD per year
Lead iOS Developer
Location: London
Job Description
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, we’ve built the world’s largest encrypted email service (Proton Mail) and expanded into Proton VPN, Proton Drive, Proton Pass, and Proton Calendar—tools used by millions globally to protect their freedom, fight censorship, and keep their data safe. In 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 it. Join us and do work you can truly be proud of.
About Photos
Join the team building Proton Drive Photos, a private photo storage designed so your memories belong only to you. We’re 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, we’d love to meet you.
The Role
As an engineer on our Apple team you’ll build and ship features across Proton’s 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 we’re 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: you’ll 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. You’ll 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 of APNs, UNUserNotificationCenter and iOS background execution (silent pushes, background app refresh, background URLSession), and how these impact app reliability
- Experience building offline-first data flows with 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.
- A great Team: Our team is diverse collaborative tight-knit with people coming from all walks of life including many of the world’s top academic institutions such as MIT Harvard Stanford Caltech Cambridge ETH.
- Technology: you'll get the right hardware software you need to do your best work.
- Learning & Development: we invest in your growth because sharp people make us better.
- Employee Benefits: strong health coverage solid retirement options generous leave wellness support.
- Stock Options: opportunity to be owners of company from day one.
- In-Person Collaboration: offices across Geneva Zürich Barcelona London more.
- Food: lunch snacks daily in offices.
- Transport: public transport bike allowances parking covered.
To learn more about our privacy policy please visit our privacy policy page
Proton stands for privacy. Always has, always will. Proton is committed to putting people before profits and building a better internet with privacy-first services such as Proton Mail, Proton VPN, and others. The company has more than 500 team members from over 40 nationalities, serving tens of millions of users globally. Proton is one of Europe’s fastest growing tech companies focused on privacy and security.
View Company Profile