Networking QA Engineer

Job description

At Proton, we envision an internet where privacy is the default, and we’re building ways to help all people secure their digital lives and take control of their data. ProtonMail was founded in 2014 by a group of scientists who met at the European Organization for Nuclear Research (CERN). And since its inception, the company has grown at a fast pace and today has over 40 million users.

Our principal product, ProtonMail, is the world’s largest secure email service. Our second product, ProtonVPN, is one of the world’s most popular VPN services. Our vision is to build an internet platform for the protection of digital rights, and we are also developing additional products, including ProtonCalendar, ProtonDrive, and more to come.

Our users include New York Times journalists, some of the world’s largest corporations, and millions of ordinary citizens. The world is adopting our products at an accelerating pace. Whether it’s in New York, or at the front lines of the global struggle for freedom and democracy in Hong Kong, Belarus, and Myanmar, the work we do saves lives and is transforming the world. Our team is diverse and dynamic, representing over 30 different nationalities, with offices in Geneva, Zurich, Prague, London, Vilnius, Skopje, and Taipei, employing people around the world.

Proton is a mission driven company. We’re deeply committed to enabling freedom online and ensuring the internet serves the interests of all people. Our technologies provide trusted ways for people to be secure online and in control of their information at all times. The world is adopting our products at an accelerating pace. Help us bring it from tens of millions of users, to billions of users. We’re creating one of the world’s most impactful tech companies.

Purpose of the role

ProtonVPN is a product based on network interactions between a wide range of different devices. The list of devices we support is expected to grow, and we are also continuously expanding and upgrading our infrastructure to accommodate a growing number of users. At the same time, we are working on new tools and features to improve the privacy and security we offer our users. We are therefore looking for a Networking QA Engineer to join our team.

As a member of the ProtonVPN QA team, you will investigate ProtonVPN’s client applications’ (Windows, macOS, iOS, Android) networking interactions, reporting issues, and suggesting improvements as required. You might be scripting in Bash, Python or Lua, or using advanced networking diagnostic tools. You will work in close collaboration with the entire ProtonVPN development team on any outstanding projects. The ideal candidate will be excited to face unique and varied challenges that require a variety of skills to resolve.


What you will do

  • As a QA member, be an active part of the ProtonVPN development team

  • Collaborate in the analysis of complex challenges related to how client applications behave, in particular, behavior-related, but not limited to, their networking stacks

  • Perform manual testing on applications’ functionality on different platforms

  • Take part in the development of innovative solutions to improve the ProtonVPN testing infrastructure and extend its functionality

  • Take part in extending existing open source projects or in creating new ones

Job requirements

  • Expert-level knowledge of application-level networking (Windows, Android, or macOS/iOS)

  • Expert-level understanding of networking/traffic inspection tools

  • Good knowledge of VPN Protocols (IKEv2, OpenVPN, WireGuard)

  • Good understanding of HTTPS certificates and public key infrastructure

  • A documented track record of contributions to open source projects and applications

  • Basic understanding of the principles of quality assurance

  • Basic understanding of software development


Bonus points for

  • Linux system administration and configuration management (Puppet, Ansible)

  • Programming languages (C/C++, Python, Lua, Rust, PHP, Bash)

  • Linux/Windows/macOS Kernel/system development

  • Code debugging and profiling


Why you should join Proton

  • We work on interesting, challenging problems every day. There is never a dull moment.

  • Our startup culture means everyone’s opinion matters. You can have a significant impact.

  • Our rapid growth means there are many opportunities for advancement.

  • The chance to do something meaningful. Our products protect dissidents, journalists, and activists. Our work saves lives.

  • Be part of something bigger. Millions of people and businesses around the world have embraced our idea of an Internet where privacy and security are the default. Join the privacy revolution that is changing the world.


ProtonMail uses the Recruitee recruitment platform for a more effective hiring process and a better candidate experience. Your data will always be kept confidential and is not shared with any third parties. Keep in mind that you will receive emails from the email address careers@protonmail.recruitee.com or other addresses on the protonmail.recruitee.com domain.


Proton does not accept unsolicited resumes from any sources other than directly from a candidate. Proton will not pay a fee for any placement resulting from the receipt of an unsolicited offer, even in a situation when the relevant candidate is employed by Proton.