Senior Android Software Engineer Barcelona

About Proton

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 it. Join us and do work you can truly be proud of. Check our open-source projects here!

The Role

Based in our Barcelona office youll join one of several high-impact product teams across Proton Pass Payments and Proton VPN helping build privacy-first products used by millions around the world. From secure password management and identity protection to encrypted financial tools and internet freedom products that help users bypass censorship and surveillance youll work on technically ambitious products with real-world impact. As a senior engineer youll collaborate closely with product design and engineers across Proton to build and ship high-quality Android experiences using Kotlin Jetpack Compose and an increasingly shared Rust core helping define what great looks like for privacy-focused consumer products at scale.

What we are looking for

• You have extensive experience building and shipping high-quality Android applications using Kotlin
• You have strong experience with Jetpack Compose and modern Android development practices
• You care deeply about product quality usability and delivering exceptional user experiences
• You have experience taking end-to-end ownership of features from scoping and technical design through to delivery and iteration
• You have strong experience building maintainable scalable and testable mobile architectures
• You are comfortable working across large codebases and collaborating across multiple teams
• You have experience mentoring engineers and raising the technical bar within a team
• You have a strong understanding of performance concurrency multithreading and mobile memory management
• You understand mobile scalability considerations including caching network usage responsiveness and offline behaviour
• You are comfortable navigating ambiguity and contributing to product and technical discussions
• Experience with privacy security encryption sync systems or offline-first architectures is a strong plus
• Rust experience is a plus but not required as we continue moving towards a platform-independent Rust logical core that communicates with our Android applications through generic interfaces

Even if you dont meet all the requirements listed above but feel you could still be a great fit please do apply.

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)
• 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.
• 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
• 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.

Compensation range

60.000 - 110.000 EUR gross annually

Final compensation will be determined based on the candidates qualifications skills and previous experience

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.

#LI-ONSITE