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LinkedIn's loop pivoted heavily in 2025 — Staff candidates now sit a packed two-round phone screen (coding + project retro) before a five-round onsite that includes an AI-Coding session in CoderPad's assistant pane. Behavioural depth is the dominant downlevel axis; the same coding bar that passes at Senior frequently caps a Staff loop with a downlevel offer.

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Alert Monitor — Rolling Window + Severity Distribution + Spike Detection

Build an `AlertMonitor` class with three queries against an append-only stream: count alerts in the trailing 15 minutes, return the severity histogram for the current hour-block, and emit a next-greater-volume index per minute. The third sub-task is monotonic-stack territory; the round tests whether the candidate picks the right data structure for each query rather than retrofitting one structure for everything.

SWE
Infra Eng
data-structure
queue
stack
sliding-window
+3
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