---
title: 'Senior Android Engineer (Pass) at Proton'
canonical: 'https://feeny.ai/job/senior-android-engineer-pass-proton-barcelona-0e9rjqrv16r6'
type: 'job'
last_seen: '2026-09-11'
---

# Senior Android Engineer (Pass) at Proton

- **Company:** Proton
- **Location:** Barcelona, Spain / Paris, France
- **Posted:** 2025-02-27
- **Last confirmed live:** 2026-09-11
- **Apply:** https://job-boards.eu.greenhouse.io/proton/jobs/4548812101

## Job description

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, coming from the world's top companies and universities. 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. We believe smaller teams of exceptional talent will always prevail over larger teams with lower talent density. 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](https://proton.me/community/open-source)!

## Role overview

As a fullstack cross-platform Senior Android Engineer, you'll play a pivotal role in developing Proton Pass using Jetpack Compose and Rust. You’ll lead with an end-to-end ownership approach, ensuring timely delivery of high-quality, scalable solutions that will delight our customers. Your ambition and enthusiasm will drive innovation and excellence both in Proton Pass and SimpleLogin products.

## 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 being able to discern the important from the 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

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

## What we offer

- Technology: we provide all the devices and software you need to excel in your role, ensuring you have the best tools at your disposal to achieve your goals
- Learning & Development: we are committed to your professional growth – Proton offers various learning opportunities, including 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, we are all owners of the company and you get stock options when you join us
- In-Person Collaboration: collaboration is easier and more effective in person, which is why we have offices in Geneva, Zurich, Prague, Barcelona, Paris, London, Vilnius, Skopje and Taipei – you can enjoy working from home for up to 30% of the time, while enjoying great company culture during our three core days in the office (depending on the role, fully remote positions may also be available)
- Food: lunch and snacks are provided by Proton every day at our offices
- Transport: we'll always support our employees with transport costs through subsidising public transport, bike allowances or parking spaces based on your office location
- Flexible Working: you can define your own working hours as long as it works with team meetings
- Work that Matters: Proton is a community-first organisation, started with the support of a crowdfunding campaign and built with community input – to this day, Proton’s only source of revenue is user subscriptions: over 100 million people trust and support Proton, and we put our users and community first in everything we do (read more about our impact [here](https://proton.me/about/impact))

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 its [Service Privacy Policy](https://www.greenhouse.com/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 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](https://boards.eu.greenhouse.io/protongdpr).

## #LI-ONSITE

## About Proton

## Company Overview
- **One-liner**: Proton provides a suite of end-to-end encrypted, privacy-first online services including email, VPN, cloud storage, password management, and AI assistant.
- **Entity Type**: Private (owned by the non-profit Proton Foundation, community-funded, profitable with no VC dependency)
- **Headquarters**: Geneva, Switzerland
- **Founded**: 2014
- **Founders**: Scientists from CERN (individual names not listed in provided sources)

## Core Business
- Primary industry/industries: Technology, Information and Internet; online privacy and security services
- Target customers: B2C (individuals, journalists, activists) and B2B (businesses of all sizes, NGOs, public sector)
- Mission or purpose statement: "To make privacy the default for everyone." – also described as defending freedom and building a better internet.

## Products & Services
- **Proton Mail**: End-to-end encrypted email service (SaaS)
- **Proton VPN**: Secure, fast VPN with no-logs policy (SaaS)
- **Proton Calendar**: Encrypted calendar that keeps schedules private (SaaS)
- **Proton Drive**: Encrypted cloud storage with secure file sharing and collaborative Proton Docs (SaaS)
- **Proton Pass**: Password manager with built-in 2FA authenticator, hide-my-email aliases, and secure notes (SaaS)
- **Proton Authenticator**: Free, open-source two-factor authentication app (Mobile/Desktop App)
- **Proton Meet**: Encrypted video call service launched in 2026 (SaaS)
- **Lumo by Proton**: Privacy-respecting AI assistant integrated with the Proton ecosystem (SaaS/API)
- **Proton for Business**: Bundled suite for organizations with admin controls and compliance features (SaaS)

## Market Standing
- **Valuation/Market Cap**: Not disclosed (company is profitable, not VC-funded)
- **Key Metric**: Annual Revenue of USD 20,000,000 (per LinkedIn); over 100 million user accounts
- **Notable Investors/Partners**: Primary shareholder is the non-profit Proton Foundation; key partnerships with CERN and MIT (origins); acquired Standard Notes Ltd. (2024) and SimpleLogin SAS (2022)
- **Growth Signals**: 600+ employees across 8+ offices globally; monthly headcount growth of +1.2%; 118 active job postings; expanding product line (e.g., Proton Meet, Lumo AI); trusted by over 100,000 businesses

## Competitive Advantages
- **Swiss jurisdiction**: Data protected by some of the world’s strongest privacy laws outside of US surveillance reach
- **Zero-access encryption**: Proton cannot technically access user data (end-to-end encryption by default)
- **Open source & audited**: All apps are open source and independently audited for trust and transparency
- **Not ad-driven**: Subscription-based business model with no ads or data selling
- **Non-profit ownership**: Proton Foundation ensures mission before profit
- **Highly selective hiring**: <1% acceptance rate, attracting top global talent

## Strategic Focus
- **Ecosystem expansion**: Integrating all services under a single Proton Account, launching new products (Proton Meet, Proton Docs, Lumo AI)
- **B2B growth**: Scaling Proton for Business with dedicated sales and compliance features
- **Migration from Big Tech**: Tools to easily import from Gmail/Outlook/Google Drive to Proton
- **AI done right**: Developing privacy-respecting AI (Lumo) that does not compromise user data
- **Open source community**: Continued commitment to open source and external audits

## Why Work Here
- **Mission-driven work**: Impact the privacy and security of over 100 million users, including activists and journalists
- **Culture**: Small, empowered teams with high talent density; real ownership from day one
- **Remote/hybrid/office policy**: Flexible working (outcomes-focused); offices in Geneva, Zurich, Skopje, Taipei, Vilnius, Barcelona, Paris, and Prague; in-person collaboration encouraged (daily lunch and snacks provided)
- **Notable perks**: Stock options for all employees, strong health coverage, generous leave, learning & development investment, public transport/bike allowance, top-of-the-line hardware
- **Engineering culture**: Open-source codebase, modern stack (migrating to TypeScript/GPL3), focus on product engineering and impact

## Sources
1. [proton.me](https://proton.me/)
2. [LinkedIn Company Profile](https://ch.linkedin.com/company/protonprivacy)
3. [Greenhouse Job Board](https://job-boards.eu.greenhouse.io/proton)
4. [Greenhouse Job Application (Frontend Engineer)](https://job-boards.eu.greenhouse.io/proton/jobs/4857528101)
5. [Levels.fyi - Proton Careers](https://www.levels.fyi/companies/proton)

## Other roles at Proton

- [Senior Product Manager (Inbox) - B2B](https://feeny.ai/job/senior-product-manager-inbox-b2b-proton-london-b1q014yraebr) — London, United Kingdom / Paris, France
- [Senior Backend Engineer (Account)](https://feeny.ai/job/senior-backend-engineer-account-proton-paris-wz851x22rx7y) — Paris, France / Geneva, Switzerland
- [Senior Product Manager B2B (VPN)](https://feeny.ai/job/senior-product-manager-b2b-vpn-proton-barcelona-v6yzm8vp3e95) — Barcelona, Spain / London, United Kingdom / Geneva, Switzerland
- [Senior Backend Engineer (Foundation)](https://feeny.ai/job/senior-backend-engineer-foundation-proton-london-93xyzcatx4nq) — London, United Kingdom / Paris, France
- [Senior DevOps Engineer - Platform](https://feeny.ai/job/senior-devops-engineer-platform-proton-paris-4r46nkmbvswk) — Paris, France / Geneva, Switzerland
- [Site Reliability Engineer - Storage](https://feeny.ai/job/site-reliability-engineer-storage-proton-geneva-switzerland-paris-jrvcvge7smx7) — Geneva Switzerland Paris, France
- [ASO Manager](https://feeny.ai/job/aso-manager-proton-london-7g8et3hkr4at) — London, United Kingdom
- [Head of Product (Mail)](https://feeny.ai/job/head-of-product-mail-proton-london-tx25vw0dca8m) — London, United Kingdom / Paris, France / Geneva, Switzerland
- [IT Support Specialist](https://feeny.ai/job/it-support-specialist-proton-paris-hrfr8jcavsky) — Paris, France
- [Software Engineer](https://feeny.ai/job/software-engineer-proton-geneva-nz2r44a2rjth) — Geneva, Switzerland / Zurich, Switzerland