R+D Engineer

Barcelona - Spain

Monthly Salary: Not Disclosed

Posted on: 17 hours ago

Vacancies: 1 Vacancy

Job Summary

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 team:

ProtonVPNruns on a distributed architecture of Linux servers and a set of apps available on each major platform (Windows Android iOS macOS and Linux) that interact with our infrastructure.

As a member of the ProtonVPN Research and Development team you will work on maintaining the security of ProtonVPNs infrastructure improving its overall performance designing and implementing new features. On any given day you might code in C or Rust script in Python or Lua create patches for the Linux kernel or debug system-level issues on different operating systems. You will work in close collaboration with the entire ProtonVPN development team on any outstanding projects. You will face unique and varied challenges that will require continuous learning.

What you will do:

Being an active member of the ProtonVPN R&D team
Collaborating with app developers to help solve the various complex challenges related to (but not limited to) the networking stack of Linux macOS iOS Android and Windows systems
Helping develop innovative solutions to improve the connectivity stability performance scalability security and resilience of ProtonVPNsinfrastructureand client software and extend their functionality
Contributing to existing open-source projects or creating new ones

What we are looking for:

Expert-level knowledge of operating system internals
Expertise with network protocols and implementation
A documented track record of contributions to system-level projects and applications
Experience with software development
Understanding of the principles of quality assurance

Bonus points for:

Expertise in Windows macOS or Linux system development
Extensive experience working with Linux kernel Windows drivers or macOS system extensions development
Strong understanding of system programming languages (C/C Rust Go Python etc.)
Experience with debugging code and code profiling
Good understanding of TCP/IP protocol and settings (e.g. congestion algorithms)
Strong understanding of VPN protocols (particularly OpenVPN and WireGuard)
Experience with cryptography concepts (e.g. TLS certificates and public key infrastructure)

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.

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 theirService Privacy 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

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 visitour privacy policy page.

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Required Experience:

About Proton Join Proton and build a better internet where privacy is the defaultProton 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 Pro...