Data ScientistUses statistics and models to answer questions with data; the "sexiest job" of 2012.
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AI EngineerA software engineer who builds products on top of models rather than training them.
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Site Reliability EngineerKeeps production up with software: on-call, SLOs and automation; Google's term.
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AI ScientistBuilds and trains new AI models for one field, such as biology or enterprise data, from research methods to the models a product relies on.