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 organizations 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, 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, with less than 1% of candidates hired. We believe smaller teams of exceptional talent will always prevail over larger teams with lower talent density. You will have the opportunity 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!

• Our frontend is built with React and Rust
• Our backend API is based on PHP/Symfony
• All our client-code is open-source and GPL3.
• We are migrating our infrastructure to Kubernetes
• Everything runs on premise in Proton's data-centers
• To organize our work we use classic tools such as Jira and Confluence

• Extensive experience with React, developing performant and reusable components
• Proficiency with TypeScript or any typed language
• Experience leading large and complex projects as a front engineer
• Bonus for experience using agentic AI
• Bonus for experience in audio/video app, WebRTC and Messaging Layer Security

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

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 their 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 anonymize 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 resumes 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.

#LI-ONSITE

【 About the role 】

We are looking for a Senior Android Engineer to lead the development of high-performance mobile experiences that bridge software and hardware. You will tackle complex challenges in low-latency streaming and IoT integration while driving architectural excellence and mentoring the team. Working across functions, you will shape our technical roadmap and ensure app stability across the diverse Android ecosystem.

【What You’ll Do 】 

• Partner with cross-functional teams to design, build, and continuously evolve high-quality Android applications.
• Tackle complex technical challenges and design scalable, maintainable architectures for core app features.
• Take ownership of key technical decisions, driving architecture, design patterns, and best practices.
• Mentor engineers, conduct code reviews, and elevate overall team engineering standards.
• Optimize performance and reliability in areas such as video streaming, real-time communication, and BLE integration.
• Improve app stability, performance, and compatibility across a diverse Android device ecosystem.
• Enhance development efficiency by refining CI/CD pipelines, testing strategies, and DevOps workflows.
• Collaborate closely with product, design, and backend teams to deliver impactful and user-centric features.

【 Who you are 】

• 5+ years of Android development experience using Kotlin, with strong experience building and shipping production apps.
• Hands-on experience with complex domains such as IoT integration, video streaming, or real-time systems.
• Proficient in asynchronous programming (Kotlin Coroutines, Flow) and performance optimization.
• Experience with modularized codebases (multi-module architecture) and scalable project structures.
• Solid debugging and problem-solving skills, with attention to performance, memory, and edge cases.
• Familiar with Git workflows, CI/CD pipelines, Agile development, and automated testing.
• Passionate about building high-quality products and continuously improving engineering practices.
• Self-motivated, detail-oriented, and able to manage multiple priorities effectively.

• Experience with BLE, IoT devices, or hardware-integrated mobile applications.
• Familiarity with video streaming technologies such as WebRTC or HLS.
• Experience optimizing Android performance, including memory usage and device compatibility.
• Experience using LLM or AI tools to improve app development workflows, such as code generation, testing, documentation, or engineering productivity.
• Strong communication skills with the ability to clearly convey technical concepts and collaborate across teams.

【Benefits】

• Flexible Time-off; work hard and take time off when you need it
• Flexible working hours and work-from-home when needed
• Medical insurance and free yearly health checkup
• Yearly health checkup subsidy for your pets
• 2 free Furbos for each full-time team member
• Company trip and employee outing program
• Internal workshop and external training subsidy for you to expand your skill set and continuously learn and grow.

【 Perks 】

• The rare opportunity to work with an international team from Taiwan HQ and make impact on a global scale
• Join a group of talents who have passion to change pet parents and pet's lives through technology
• The freedom to voice yourself in an open, trusting and transparent working environment
• Quarterly all-hands meetings to update entire organization on company goals, strategic directions and the opportunity to openly ask questions/give feedback
• Bring your fur babies to work in a pet-friendly office space designed to make your pet feel relaxed and comfortable
• Join our volunteer program. We are passionate about giving back to society.
• Various club activities to cultivate interests and have fun with Tomofuners after work!
• A LOT of free snacks and drinks for humans and furkids!
• Comfortable and creative office with kitchen, sofa, and quiet areas. Everyone can find their ideal place to work!
• Afternoon tea time twice a month and monthly birthday parties. We celebrate all the happy moments together.

• Refactor existing code and increase test coverage (UT and FT)
• Review the code of other members of the team

• Experience and/or desire for using AI development tools (i.e. Claude/Gemini) to complement your core C++ skills.
• It is our goal to open our server source code as a tool to the entire C++ video world, so experience with driving open source communities is a plus.

• Experience with WebRTC media pipelines

• Competitive compensation
• Paid time off
• Flexible working hours
• Hybrid work in our brand-new comfortable office
• Employer-sponsored health coverage
• Working with top industry experts in our international team

• Refactor existing code and increase test coverage (UT and FT)
• Review the code of other members of the team

• Experience and/or desire for using AI development tools (i.e. Claude/Gemini) to complement your core C++ skills.
• It is our goal to open our server source code as a tool to the entire C++ video world, so experience with driving open source communities is a plus.

• Experience with WebRTC media pipelines

• Competitive compensation
• Paid time off
• Flexible working hours
• Hybrid work in our brand-new comfortable office
• Employer-sponsored health coverage
• Working with top industry experts in our international team

• Refactor existing code and increase test coverage (UT and FT)
• Review the code of other members of the team

• Experience and/or desire for using AI development tools (i.e. Claude/Gemini) to complement your core C++ skills.
• It is our goal to open our server source code as a tool to the entire C++ video world, so experience with driving open source communities is a plus.

• Experience with WebRTC media pipelines

• Competitive compensation
• Paid time off
• Flexible working hours
• Hybrid work in our brand-new comfortable office
• Employer-sponsored health coverage
• Working with top industry experts in our international team

• Refactor existing code and increase test coverage (UT and FT)
• Review the code of other members of the team

• Experience and/or desire for using AI development tools (i.e. Claude/Gemini) to complement your core C++ skills.
• It is our goal to open our server source code as a tool to the entire C++ video world, so experience with driving open source communities is a plus.

• Experience with WebRTC media pipelines

• Competitive compensation
• Paid time off
• Flexible working hours
• Hybrid work in our brand-new comfortable office
• Employer-sponsored health coverage
• Working with top industry experts in our international team

• Refactor existing code and increase test coverage (UT and FT)
• Review the code of other members of the team

• Experience and/or desire for using AI development tools (i.e. Claude/Gemini) to complement your core C++ skills.
• It is our goal to open our server source code as a tool to the entire C++ video world, so experience with driving open source communities is a plus.

• Experience with WebRTC media pipelines

• Competitive compensation
• Paid time off
• Flexible working hours
• Hybrid work in our brand-new comfortable office
• Employer-sponsored health coverage
• Working with top industry experts in our international team

• Refactor existing code and increase test coverage (UT and FT)
• Review the code of other members of the team

• Experience and/or desire for using AI development tools (i.e. Claude/Gemini) to complement your core C++ skills.
• It is our goal to open our server source code as a tool to the entire C++ video world, so experience with driving open source communities is a plus.

• Experience with WebRTC media pipelines

• Competitive compensation
• Paid time off
• Flexible working hours
• Hybrid work in our brand-new comfortable office
• Employer-sponsored health coverage
• Working with top industry experts in our international team