macOS System Developer

Remote job

Full Time Mid-level / Intermediate
Proton Technologies AG logo
Proton Technologies AG
Apply now Apply later

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). 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 developing additional products, including Proton Calendar and Proton Drive, with more to come.

Proton users include leaders of the Hong Kong protest movement, New York Times journalists, some of the world’s largest corporations, and millions of ordinary citizens from over 180 countries. Our team is diverse and dynamic, representing over 30 different nationalities, with offices in Geneva, Zurich, Prague, Vilnius, Skopje, and Taipei. We're also considering future potential office locations such as London and Barcelona.

What you will do:

Take part in developing ProtonVPN’s Apple clients, focusing on the macOS platform in particular. The most advanced functionalities we are building on macOS require creating system extensions and mastering the network stack.


  • Experience in macOS Swift development

  • 4+ years experience in software development, with a strong command of OOP

  • Experience creating macOS system extensions

  • Knowledge of macOS network stack and operation

  • Knowledge of Git or other source control

Bonus points for:

  • Experience in C/C++/Objective-C coding

  • Networking experience, in particular on Apple platforms

  • Well-versed in security, and with a good understanding of security best practices for desktop and mobile development

  • Open source contributor

  • Bachelor's or master’s degree in a relevant field of study and/or a science background

Why work at 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. Proton 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.

Proton Technologies AG 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 or other addresses on the domain.

Job region(s): Worldwide/Anywhere
Job stats:  1  0  0
  • Share this job via
  • or

Explore more Remote work and WFH career opportunities