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Join Proton and build a better internet where privacy is the default At Proton, we believe that privacy is a fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security, and freedom online.
Proton is a profitable company that does not rely upon VC funding, supporting over 100 million user accounts with a growing team of over 500 people from over 50 different countries. We value intelligence, learning potential, and ambition in our hiring process. Adaptability is key as we navigate uncharted territories and redefine how business is conducted online.
Hiring at Proton is highly selective, with less than 1% of candidates hired. We believe smaller teams of exceptional talent will always prevail over larger teams with lower talent density. You will have the opportunity to work with many of the world's top minds in their fields.
We have a global mindset and big ambitions but remain a start-up at heart. We value empowerment and flexibility and keep our structure flat to move fast. Check our open-source projects here.
Purpose of the role MSA is a multi-disciplinary group started in 2019 to tackle difficult mail delivery, spam, abuse, and account security problems within the Proton ecosystem. We built systems that make tens of millions of decisions daily, combining human intelligence and machine learning. Our systems have reduced spam misclassifications, blocked abusive signups, protected users from account compromise, and mitigated DDoS attacks. We are also building new products, including Wallet, Lumo AI, and Meet. We are the main group at Proton working on AI. We operate with autonomous teams covering infrastructure, data storage, backend, web and mobile apps, machine learning, security and operational excellence.
What You Will Do Proton Software Engineers in MSA build and operate services across domains. You will:
* design, build, and operate systems with other engineers and analysts
* work on special user-facing features involving frontend and backend development
* have the opportunity to play Product or Project Manager roles and lead planning and development
* be responsible for the operational excellence of the systems/features and their interaction with other systems
* potentially work on Python-based custom systems, the main Proton API (PHP), Proton Web apps (React), or native iOS/Android apps
Job Requirements
* Deep experience with backend development (Python, PHP, or Go)
* Experience with frontend design and development (JavaScript, React, TypeScript, or jQuery)
* Experience building complex production systems
* Experience with data processing and storage (MySQL, MongoDB, Redis, Kafka, Elastic, Ceph, ClickHouse)
* Able to work autonomously and lead the full development process from design to QA
* Experience with AI tools and AI agents
* Excellent English communications, both written and spoken
Bonus points for:
* Experience with machine learning and real-time prediction systems
* Experience with iOS or Android app development
* Experience with managing Linux servers, including infrastructure as code (Puppet, Ansible) and containerization
What We Offer
* Office First: offices in Geneva, Zurich, Prague, Barcelona, Paris, London, Vilnius, Skopje, and Taipei; up to 30% remote work with three core in-office days
* Technology: devices and software provided to excel in your role
* Food: lunch and snacks provided at offices
* Transport: subsidies for public transport, bike allowances, or parking
* Stock Options: ownership through stock options
* Flexible Working: define your own hours around team meetings
* Learning and Development: training programs, conferences, and continual learning
* Employee Benefits: health insurance, retirement options, generous vacation, wellness programs
* Work that Matters: Proton is community-first and revenue comes from user subscriptions
Our Commitment to Diversity and Inclusion
We believe diversity drives innovation and are committed to fostering an inclusive environment. We support equal opportunities and open dialogue, ensuring every voice is heard and respected. If you need extra support or reasonable adjustments during hiring, please contact your talent partner.
Candidate Privacy Notice
When you apply for a position, refer a candidate, or are considered for a role, your information is stored in Greenhouse in accordance with their Service Privacy Policy. We retain information for future roles as appropriate. If you wish to access, correct, or delete your data, contact our privacy team at careers@proton.ch.
Proton does not accept unsolicited resumes from sources other than directly from candidates and will not pay a fee for unsolicited offers.
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