Back-End Engineer (MSA)

Updated about 1 month ago

Job Description

A better internet, where privacy is the default, is possible. Building this better internet might seem daunting or even unthinkable, but at Proton, this is what we do every day.

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

Today, Proton makes privacy universally accessible. Journalists from outlets like The Guardian and The New York Times, some of the world’s largest organizations, and people in more than 180 countries have signed up for over 70 million accounts. Our diverse and dynamic team is made up of more than 400 members representing over 40 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.

Join 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

The MSA department is a highly multi-disciplinary group started in 2019 to tackle difficult mail delivery, spam and abuse problems. We built sophisticated systems from scratch that combine human intelligence and machine learning to make tens of millions of realtime or asynchronous decisions each day. As of 2022, our three areas of focus are 1) mail delivery and spam, 2) abuse and account security, and 3) site reliability of Proton. Over the past 3 years, our custom systems have reduced spam filter misclassifications by over 50%, blocked millions of abusive bulk signups, protected hundreds of thousands of users from account compromise by attackers, and mitigated hundreds of DDoS attacks. In order to move fast with limited resources, we are organized into autonomous teams responsible for the whole system, with expertise across infrastructure, data storage, backend, frontend, machine learning, security and operational excellence. In 3 years, we grew from 2 engineers to over 30 engineers and analysts, spread across 3 continents for 24/7 coverage. We are looking for humble, mission-driven, systems-thinking people who want to make a big impact in a startup environment.

What you will do

MSA builds and maintains many backend services responsible for different domains. You will work with other engineers and analysts to design and build new features for these systems. As an engineering-driven organization, MSA currently doesn't have product or project managers, so you will have the opportunity to play those roles and lead the whole planning and development process. You will be responsible for the operational excellence of the systems and their interaction with other systems. The work is heavily focused on data engineering and using data to make sophisticated and automated decisions. You may work on MSA's custom systems written in Python or on the main Proton API written in PHP.

    Please apply for the position via, Thank you!


    • Deep experience with Python, PHP, or Go
    • Experience building complex production systems, especially involving big data
    • Experience with data processing and storage (MySQL, MongoDB, Redis, Kafka, Elastic, Ceph, ClickHouse)
    • Experience with managing Linux servers, including infrastructure as code (Puppet, Ansible) and containerization
    • Able to work autonomously and lead the whole development process, from design to QA
    • Excellent English communications, both written and spoken
    • Experience with machine learning and real-time prediction systems would be a plus
    • Experience with JavaScript, React, Typescript, and jQuery would be a plus

    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.
    • Benefits – these vary by location and type of contract but expect support on your vacation, parental leave, refreshment if working from the office, learning and development opportunities, equity for shared success, flexible working hours and remote work, company events and team building activities.

      Interview process

      Please apply for the position via, Thank you!

      3 years of experience required
      1.2M+ TWD / year
      Partial Remote Work
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      About us

      我們正在建構一個能保護隱私的網際網路,從電子郵件開始。我們是一群想爭取線上公民自由權的科學家、工程師與開發人員。這是我們建立 Proton Mail 的原因,Proton Mail 是一個簡單易用的加密電子郵件服務,並提供內建端對端加密以及許多最新的安全功能。我們的目標是要建立一個尊重隱私的網際網路,並能安全地防範網路攻擊。

      我們在瑞士(Geneva, Zurich)、北馬其頓(Skopje)、台灣(Taipei)、立陶宛(Vilnius)、英國(London)、捷克(Prague)及歐洲等地共有400多位員工,全球超過 7,000 萬名用戶。我們致力於開發並提供能保護您線上資料的工具如Proton Mail, Proton VPN, Proton Calendar, Proton Drive,且仍持續開發更多產品。我們的團隊不僅有來自世界上頂尖研究機構的數學與科技知識,還結合了建構簡單易用使用者界面的技術。

      在建立一個尊重隱私的網際網路的運動中,我們正在往前邁出最大的一步。我們所有的服務 (Proton Mail、Proton Calendar、Proton Drive 和 Proton VPN) 現在會整合成一個帳戶以及一個將隱私作為預設的生態系統 — Proton。
      Proton 會一直是開放原始碼的,並會持續為開放標準而奮鬥。我們將會永遠保持完全獨立、中立、且以社群為優先。這次新版本的 Proton 只是一個開端,在未來,我們期待能為你帶來更多注重隱私的服務和功能。


      We're building an internet that protects privacy, starting with email. We are scientists, engineers, and developers drawn together by a shared vision of protecting civil liberties online. This is why we created Proton Mail, an easy-to-use secure email service with built-in end-to-end encryption and state-of-the-art security features. Our goal is to build an internet that respects privacy and is secure against cyberattacks. We are committed to developing and widely distributing the tools necessary to protect your data online. Our team combines deep mathematical and technical knowledge from the world's top research institutions with expertise in building easy-to-use user interfaces. Together, we are building the encrypted communication technologies of the future.

      Our team is diverse and dynamic, Proton has offices in Geneva (HQ), Zurich, Skopje, Taipei, Vilnius, London and Prague, with employees working remotely in 17 countries, collectively serving tens of millions of users globally.
      Proton Taiwan was established in November 2019 to be a major new engineering office. We are looking for passionate people to join our growing team and help us build a better Internet that defends democracy.


      Mid-Senior level
      1.1M+ TWD / year