Android Developer (Inbox)

Join to apply for the Android Developer (Inbox) role at Proton.

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

At Proton, we believe that privacy is a fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security and freedom online. Our journey began with Proton Mail, the largest secure email service globally, and has since expanded to include Proton VPN, Proton Calendar, Proton Drive and Proton Pass. These tools empower individuals and organisations to take control of their personal data, break away from Big Tech’s invasive practices and defeat censorship. Our work impacts hundreds of millions of lives, from activists on the front lines defending freedom to leaders in governments protecting sensitive information. In some cases, Proton’s services have even been instrumental in saving lives by enabling secure and private communications in high-risk situations.

Proton is a profitable company that does not rely upon VC funding, supporting over 100 million user accounts with a growing team of over 500 people from over 50 different countries. We value intelligence, learning potential and ambition in our hiring process. Adaptability is key as we navigate uncharted territories and redefine how business is conducted online. Hiring at Proton is highly selective, with less than 1% of candidates hired. You’ll have the opportunity to work with many of the world\’s top minds in their fields, ranging from former international math and science olympiad winners to chess champions.

We have a global mindset and big ambitions but remain a start‑up at heart. We value empowerment and flexibility and keep our structure flat to keep moving fast and avoid unnecessary politics. Tired of blending into the crowd? Join us and do work you can truly be proud of. Check our open-source projects here!

Role Overview

As a full‑stack cross‑platform Android Engineer, you’ll play a pivotal role in developing Proton Inbox using Jetpack Compose and Rust. You’ll use an end‑to‑end ownership approach, ensuring timely delivery of high‑quality, scalable solutions that will delight our customers.

Key Responsibilities

• Develop and maintain cross‑platform mobile applications for Android using a blend of cross‑platform (Rust) and native technologies (Kotlin).
• Take end‑to‑end ownership of mobile application development projects: scope projects, walk back from deadlines and discern the important from the superfluous.
• Foster a culture of innovation by exploring new technologies, methodologies and approaches to mobile development.
• Optimize mobile applications for performance, usability and responsiveness across different devices and screen sizes.
• Master memory management, multithreading and concurrency mechanisms to enhance performance and responsiveness.
• Design for scalability, considering data caching, network bandwidth and server load.
• Prioritize customer satisfaction by maintaining a customer‑centric mindset, continuously seeking feedback and iterating to improve the user experience.

The ideal candidate will bring

• Bachelor’s degree in Computer Science, Engineering or related field (or equivalent work experience).
• Excellent problem‑solving skills and the ability to think outside the box to overcome challenges.
• Passion for continuous learning and driving change in the rapidly evolving field of mobile development.
• Excellent communication and interpersonal skills.
• Proven experience developing mobile applications for Android using Kotlin.
• Proficiency with Jetpack Compose for Android and familiarity with Rust.
• Strong understanding of mobile app architecture, design patterns and best practices.
• Knowledge of memory management techniques and best practices.
• Experience with multithreading and concurrency in mobile applications.
• Good understanding of scalability considerations.
• Previous experience working in a fast‑paced, scale‑up environment.

Even if you don’t meet all the requirements above but feel you could still be a great fit, please do apply.

What We Offer

• Technology: we provide all devices and software you need to excel in your role.
• Learning & Development: we are committed to your professional growth – training programs, conferences/events and continual learning.
• Employee Benefits: comprehensive health insurance plans, competitive retirement savings options, generous vacation/leave policies and wellness programs.
• Stock Options: at Proton, you get stock options when you join us.
• In‑Person Collaboration: offices in Geneva, Zurich, Prague, Barcelona, Paris, London, Vilnius, Skopje and Taipei – you can work from home up to 30% of the time.
• Food: lunch and snacks are provided daily at our offices.
• Transport: we support transport costs via subsidies, bike allowances or parking spaces based on location.
• Flexible Working: define your own working hours as long as it works with team meetings.
• Work that Matters: Proton is a community‑first organisation, started with crowdfunding and built with community input. Over 100 million people trust and support Proton – we put users and community first in everything we do.

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, your information is stored in Greenhouse, in accordance with its Service Privacy Policy. This information is used to evaluate your suitability for the posted position. We 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 careers@proton.ch.

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 visit our privacy policy page.