Principal ML Engineer

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Principal Machine Learning Engineer About Mimecast The work people build is worth protecting, and it's harder to protect than it used to be. AI agents now move at machine speed with human-level access, and a small slip-up can become a very public one. We disrupt cybercriminal activity before that happens. We think fast, go big, and always demand more of ourselves. We work hard, deliver, and repeat. We grow with real determination and put success well within reach. We push each other to be better and expect to be pushed back, in a community built on respect, where everyone is counted. Work Protected. Overview As a Principal Machine Learning Engineer, you will set technical direction for Mimecast's ML capabilities, including our GCI products or advanced email threat-detection products. This is a senior individual-contributor role: you will own the hardest modeling and systems problems end to end, define the architecture other engineers build on, and be a technical authority for product and engineering leadership when the direction is not obvious. Our threat ML runs on Mimecast's shared AI enrichment platform, the detection and extraction infrastructure serving models across the product suite. You will work at the intersection of applied ML, production model serving, and cross-team integration, making architectural decisions that hold up under production load and customer commitments. Mimecast is an AI-first engineering organization. You will use AI development tools, including

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