Back-end Engineer (API)

Job description

Our company

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.

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.


Role description

Our Payments and Core teams are looking for Back-End Engineers to help build efficient, testable, and well-documented code that delivers real business value. Both Core and Payments teams focus on creating technical implementations that are shared across all Proton products: ProtonMail, ProtonCalendar, ProtonDrive, and ProtonVPN. The reliability of our core codebase is crucial for the consistent and smooth functioning of all our products. Enjoy the benefits of a flexible work environment that values independent contributors as well as teams utilizing Agile workflows.

We aim to deliver the best experience for people who care about their security and privacy.


What you will do

  • Design, build, and maintain large-scale products
  • Ensure that all parts of the technical design are correctly incorporated
  • Write clear, tested, and documented code
  • Follow high engineering standards and best practices

Job requirements

  • At least 3 years of experience in designing and building highly scalable systems
  • Fluent English language and strong communication skills
  • Excellent knowledge of object-oriented programming paradigm (SOLID principles, design patterns) 
  • Good knowledge of SQL
  • Experience in code testing
  • Good understanding of web technologies (Rest API, HTTP, HTML, etc.)
  • Experience with modern PHP

Bonus points for:

  • Experience with CI and test automation
  • Experience with Linux and containers (like Docker or Kubernetes)
  • Experience with DevOps practices and implementations
  • Professional experience with statically typed language
  • Being active in the open-source community


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. 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.


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