Back-end Engineer (Anti-Abuse)

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

Our anti-abuse group is responsible for protecting Proton users and infrastructure from attack by bad actors. We have built custom systems that detect suspicious behaviour or traffic and then automatically mitigate them in real-time. Some examples of what we deal with include blocking bulk signups, preventing attackers from compromising user accounts, disabling spammers that abuse ProtonMail, and mitigating DDoS attacks. In order to build and operate these sophisticated solutions, the group consists of a mix of software engineers, site reliability engineers, machine learning engineers, and analysts. For high availability and reliability, the group is split across multiple time zones to support 24/7 coverage.



What you will do

  • Build new features for our abuse detection and prevention systems to improve on bulk signups, spammer detection, account security, DDoS, etc.
  • Work with front-end engineers to build custom dashboards that allow us to monitor and interact with the systems 
  • Work with ML engineers and analysts to provide them with the right data efficiently
  • Work with other teams in Proton to integrate our systems (get data / give predictions) 
  • Automate, deploy, monitor, and troubleshoot systems that must work reliably 24/7

Job requirements

  • Experience engineering complex production systems (we use Python and PHP)
  • Experience with data processing and storage (MySQL, Redis, Kafka, Elastic, ClickHouse)
  • Experience with DevOps on Linux servers

Bonus points for

  • Experience with machine learning real-time prediction system


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. 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 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.