#time series

9 time series interview questions, asked at Amazon, Airbnb, Apple and 7 more companies. Last asked Oct 2026.

Ingest MCAP driving logs and query them by timestampCodingBuild a small data service over recorded vehicle drives, with an AI coding assistant allowed. Each drive (a run) is stored as an MCAP file: timestamped messages on several topics…
Last asked Oct 2026
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Design a metrics monitoring systemSystem designCollect metrics from every host and service, store them as time series, power dashboards over months of data, and alert when thresholds are crossed.
Last asked Oct 2026
Aggregate and query vehicle telemetrySystem designA fleet of vehicles reports data such as detected obstacles and vehicle metrics. Design how this data is ingested, aggregated and queried, for example counts over time and place…
Last asked Aug 2026
Forecast storage demand across data centersML designForecast how much storage each of about 100 data centers will need, so capacity can be bought ahead of time. Cover the target and horizon (daily demand, weeks or months ahead)…
Last asked Aug 2026
Design a fitness tracking appSystem designDesign a fitness tracking app: users record workouts such as runs and rides from their phone, see their history, and view the route of each workout on a map. Cover uploading…
Last asked Mar 2026
Design a real-time temperature monitoring systemSystem designCollect readings from millions of sensors every few seconds, show live and historical temperatures, and alert when a sensor goes out of range or silent.
Last asked Jan 2026
Design a user activity query systemSystem designDesign a system that stores user activity events at scale and lets services query a user's activity, for example everything a user did in a time range, filtered by type. Cover the…
Last asked Dec 2025
Time-series manipulation with pandas groupbyCodingGiven a pandas DataFrame of timestamped records, answer questions with groupby: aggregate per group and time period, resample, and compute rolling or cumulative values. Explain…
Last asked Aug 2025
Design a traffic forecasting systemML designForecast speed on every road segment for the next hour from live GPS traces, for routing and arrival-time estimates.