Senior Python/GTK+ Linux client developer

Job description

A better internet is possible, one that empowers people to choose how their personal information is used. This might seem daunting, or even impossible, but at Proton, building this better internet is what we do every day.

ProtonMail was founded in 2014 by a group of scientists who met at the European Organization for Nuclear Research (CERN). Our first product, ProtonMail, is now the world’s largest encrypted email service. Subsequent Proton products, such as ProtonVPN, Proton Calendar, and Proton Drive, use end-to-end encryption that gives our users full control over how and with whom their data is shared.

Today, Proton is making privacy universally accessible to more than 50 million registered users, including journalists, some of the world’s largest organizations, and people in more than 180 countries. Our diverse and dynamic team is made up of more than 400 members representing over 30 different nationalities. While we are based in Geneva, Switzerland, we have offices in Zurich, Prague, London, Vilnius, Skopje, Taipei, and many more employees working remotely around the world.

New York Times journalists, some of the world’s largest corporations, and millions of ordinary citizens use our products so they can choose who, if anyone, sees their information. Join us at one of Europe’s fastest-growing companies to help us solve challenging problems and build new products that will reach hundreds of millions of people. We want to create more than just one of the world’s most impactful tech companies, we want to create a new internet that serves the interests of all people. We need you, your voice, your ideas, and your ambition to make it happen.

Purpose of the role

ProtonVPN is composed of a distributed global infrastructure of VPN servers, and a set of clients for each major platform. You would be joining the Linux ProtonVPN Client Team, to take part in the development of the ProtonVPN Linux Desktop client for all the major Linux distributions. As a senior software engineer, with your technical expertise, you will manage project priorities, deadlines, and deliverables. You will design, develop, test, deploy, maintain, and enhance software solutions.

Within the Linux Team, you will collaborate with fellow Linux developers, QA engineers, Product Manager and Customer Support to develop the Linux client.


What you will do

  • Lead decisions to build primary Linux application.
  • Architect and develop solutions to ambiguous problems with significant impact.
  • Mentor and train other team members on design techniques and coding standards.
  • Facilitate alignment and clarity across the team on goals, outcomes, and timelines.
  • Analyze and optimize infrastructure application code for quality, efficiency, and performance.

Job requirements

  • 6+ years of experience in software development with a strong command of OOP.
  • Broad Python Experience
  • Experience in Linux desktop client development (in particular through the GTK+ framework, or alternatively QT)
  • Applied best practices in code quality paradigms
  • Experience with DevOps principles and practices
  • Mastering source control flow through Git or other source control (code reviews, optimizing release processes...)
  • Open source Linux development, distribution, packaging and maintenance for multiple distros (e.g. on Debian or Fedora-based platforms)
  • Overall, handling the entire SDLC, end to end
  • Excellent communication and a strong sense of ownership.


Bonus points for

  • Experience working with RESTful web APIs.
  • Experience in major Python framework (e.g. Flask/Django)
  • Practical experience with major VPN protocols (OpenVPN, IKEv2, WireGuard)
  • Practical experience with modern Linux stacks such as NetworkManager and systemd
  • Networking experience on Linux platforms.
  • Well-versed in security and with a good understanding of security best practices for Linux development.
  • Leadership experience, with experience of scaling to millions of users.
  • Bachelor's degree in a relevant field of study and/or scientific background.


Why you should join Proton

  • Be part of a movement - Proton is not just a product or service but a community-driven movement united by a shared vision of online freedom. Our services are open source, audited, and supported by community contributions. We give back to our community by maintaining core encryption libraries and by supporting other organizations furthering the same goals as us.
  • Work with smart and dedicated people - Our team is diverse, collaborative, and tight-knit with people coming from all walks of life, including many of the world’s top academic institutions and organizations, such as MIT, Harvard, Stanford, Caltech, Cambridge, and ETH.
  • Join a strong brand - Our encrypted email service - ProtonMail - has grown to be a staple of online security and privacy. Proton has been featured in multiple popular television and film productions, such as Mr. Robot, Knives Out, Sounds of Metal, and more.
  • Grow with us - We’re one of Europe’s fastest-growing startups, doubling in size every year. Our growth gives you limitless career and educational opportunities as well as the opportunity to work side-by-side with many world-leading experts in their fields.
  • Have your voice heard - We value your opinion and encourage you to speak up and share your ideas and thoughts. At Proton, no problem is someone else’s problem. We collectively strive to do the right thing and be the undisputed best in the world at everything we do.


Proton uses the Recruitee recruitment platform for 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.