Machine Learning Engineer

Proton · Geneva; Taipei

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Company
Proton
Location
Geneva; Taipei
Posted
March 26, 2026

About this job

About the role: The MSA team (Mail Delivery, Spam, and Anti-Abuse) is a multidisciplinary group founded in 2019 to solve complex security challenges across the Proton ecosystem. We build sophisticated systems from scratch that combine human intelligence and machine learning to make tens of millions of real-time or asynchronous decisions daily. Our focus areas include: Mail delivery and spam prevention Abuse detection Account security Site reliability and resilience Over the past few years, our custom systems have: Reduced spam filter misclassifications by over 70% Blocked millions of abusive bulk signups Protected hundreds of thousands of users from account compromises Mitigated hundreds of DDoS attacks Recently, we’ve expanded our impact with Proton Sentinel (an AI-human hybrid security…

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