Android Developer (Inbox)

proton tehnologies; Paris; Sur place; EUR 90 000 - 120 000; Plein temps

Avantages offerts par ce poste

Stock Options

Health coverage

Professional development

Lunch and snacks

Paid time off

Résumé du poste

Proton Technologies AG in Paris is seeking a full‑stack Android Engineer to advance Proton Inbox with Jetpack Compose and Rust, delivering scalable, user‑centric mobile solutions.

You will own end‑to‑end mobile features, collaborate with product and backend teams, and optimize performance across devices. This role offers strong ownership, rapid impact and the chance to contribute to a privacy‑focused product.

Qualifications

• Bachelor's degree in Computer Science, Engineering or related field.
• 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 when it comes to engineering mobile applications.
• Previous experience working in a fast-paced, scale-up environment.

Responsabilités

• 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: you'll be comfortable with scoping projects, walking back from deadlines and discerning what’s important from what’s superfluous
• Foster a culture of innovation by exploring new technologies, methodologies and approaches to mobile development – we tackle complex engineering challenges with creativity and ingenuity
• Optimise 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 of mobile applications
• Design for scalability, considering factors such as data caching, network bandwidth and server load
• Prioritise customer satisfaction by maintaining a customer-centric mindset throughout the development process, continuously seeking feedback and iterating to improve the user experience

Connaissances

Kotlin

Jetpack Compose

Rust

Android

Mobile development

Memory management

Multithreading

Performance optimization

Formation

Bachelor's degree in Computer Science, Engineering or related field

Description du poste

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. Check our open‑source projects here!

Role overview

As a fullstack cross‑platform Android Engineer, you'll play a pivotal role in developing Proton Inbox (which comprises of Mail and Calendar) 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: you'll be comfortable with scoping projects, walking back from deadlines and discerning what’s important from what’s superfluous
• Foster a culture of innovation by exploring new technologies, methodologies and approaches to mobile development – we tackle complex engineering challenges with creativity and ingenuity
• Optimise 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 of mobile applications
• Design for scalability, considering factors such as data caching, network bandwidth and server load
• Prioritise customer satisfaction by maintaining a customer‑centric mindset throughout the development process, 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 when it comes to engineering mobile applications
• Previous experience working in a fast‑paced, scale‑up environment

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
• Technology: you’ll 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 you’ll be thrown into real challenges, with real ownership, from day one.
• Employee Benefits: your wellbeing isn’t 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 we’re 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, you’ll spend most of your time collaborating face‑to‑face with people who genuinely care about what they’re building.
• Food: lunch and snacks are on us every day in our offices so you can focus on the work and not on what’s for lunch.
• Transport: getting to the office shouldn’t 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.

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 its Service 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 [e-mail].

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.

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