Staff EngineerThe senior individual-contributor track: technical leadership without managing people.
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AI Enablement EngineerBuilds AI agents, retrieval pipelines and automations for an internal team's work, such as HR or IT, and writes the guides to use them.
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Site Reliability EngineerKeeps production up with software: on-call, SLOs and automation; Google's term.
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Platform EngineerBuilds the internal platform other engineers deploy on: clusters, CI, paved roads.