iOS Software Engineer Intern

Zurich; Paris; 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 organisations and elite academic backgrounds. We move fast, keep hierarchy light, and prioritise 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. Check our open-source projects here! The Role We’re looking for an iOS Developer Intern to help build and launch a brand-new iOS application from the ground up. You’ll work closely with senior iOS engineers, a product manager, and a designer to develop and iterate on core features using SwiftUI and The Composable Architecture (TCA). This internship offers real ownership of well-scoped features, hands-on experience preparing an app for public release, and exposure to best practices for shipping production-ready iOS apps. You’ll contribute to a product tackling meaningful privacy challenges, particularly in areas impacting women’s digital privacy with the potential to reach 100+ million users. What you will do:

• Contribute to the development and launch of a brand-new iOS application
• Build and iterate on core product features using TCA, SwiftUI
• Take ownership of well-scoped features with real impact on the final product
• Help prepare the app for public release, including testing, polishing, and performance improvements
• Participate in code reviews and learn best practices for shipping production-ready iOS apps
• Work on a product designed to address meaningful privacy challenges, including areas impacting women’s digital privacy

What we are looking for:

• Solid understanding of Swift
• Basic familiarity with SwiftUI and TCA
• Experience building at least one iOS app or feature (school, personal, or hobby)
• Ability to use Xcode and run/debug on simulator or device
• Comfortable with version control (Git)
• Good communication and collaboration skills
• Interest in privacy, security, or user trust

Nice to have:

• Having shipped or published a personal app (TestFlight or App Store)
• Basic experience writing unit tests or UI tests
• Understanding of networking layers (URLSession, handling errors, retries)
• Ability to measure performance or track crashes (Xcode instruments, basics)

What We Offer

• Office First: Collaboration is easier and more effective in person; offices in Geneva Zurich Prague Barcelona Paris London Vilnius Skopje Taipei; up to 30% remote work allowed.
• Technology: Devices/software provided.
• Food: Lunch/snacks daily at offices.
• Transport: Support via subsidies.
• Stock Options: Granted upon joining.
• Flexible Working: Own hours within team meeting constraints.
• Learning/Development: Training programs/conferences/events.
• Employee Benefits: Health insurance retirement savings vacation leave wellness programs.
• Work that Matters: Community-first organization funded by user subscriptions trusted by 100+ million users.

Our Commitment to Diversity and Inclusion Proton fosters an inclusive environment valuing diversity regardless of race/ethnicity/gender/age/sexual orientation/physical ability/socio-economic background. Equal opportunities promoted along with open dialogue.

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