Network Security Engineer (DDoS mitigation)

Job description

Our mission is to defend human rights and democracy through building software that is essential for digital freedom and privacy protection for all Internet users.

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 such as Proton Calendar, Proton Drive, and much more.

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, San Francisco, and Taipei.

Role description

We are looking for a Security Engineer to help us protect the infrastructure that powers our services and safeguards our users' privacy. As a member of our security team (or Proton-CERT), you will work closely with your colleagues (currently five team members in total, located in Europe) and support other Proton employees throughout the company. In this role, building strong relations with members of the networking and core infrastructure teams are essential.

You will help us make our infrastructure more resilient, build up better monitoring and detection, and help us automate mitigation without impacting our services. As strong believers in free, open source software, our services rely on technologies like Linux and ELK, and we automate using scripting languages such as Python and Jupyter. Proton's focus on privacy comes with a unique challenge to our architecture, so much of your work will be necessarily innovative.


  • Analyzing and understanding DDoS attacks against Proton
  • Supporting infrastructure and development engineers in building resilient systems
  • Managing and defining DDoS-related aspects of the incident response processes
  • Developing, implementing and maintaining mitigation procedures
  • Improving the automated detection and classification of attacks
  • Monitoring the threat profile of the company
  • Developing state-of-the-art knowledge of DDoS attack and mitigation techniques
  • Working with other team members and strengthening our holistic security posture

Job requirements

  • Experience in DDoS mitigation and incident response
  • Several years of experience in a security role
  • Knowledge of current tactics, techniques and procedures commonly employed by malicious actors
  • Strong knowledge of network technologies
  • Good knowledge of Linux-based web infrastructures, in particular, L4 - L7
  • Strong communication skills in English
  • Enjoy working across teams in an interdisciplinary manner

We realize this is a long list of requirements. If you feel like a good fit, despite not ticking all boxes, talk to us and let us know why we should hire you!

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. ProtonMail protects 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 or other addresses on the domain.