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Castle (YC W16) | Sr. Data Scientist | San Francisco, CA | ONSITE I'm one of the co-founders at Castle (https://castle.io), a seed funded cybersecurity startup. Castle uses machine learning to protect millions of consumers from account hacks. We are hiring our second data scientist. We’re looking for someone who would be owning the core piece of our business -- our risk engine -- and who thrives in a fast-paced environment. The ideal candidate would have experience in fraud detection and/or security, and building real-time machine learning algorithms at scale. Our office is located in San Francisco (SOMA), close to Civic Center BART Station. If you're looking for a small, close-knit startup with an opportunity to have a huge positive impact, please email me at johan@castle.io.