Top 50 scalability Interview Questions
The most frequently asked scalability questions across all roles and companies, ranked by real interview frequency. Updated daily.
Aggregate active endpoint traffic and error rates efficiently for high-traffic application monitoring.
Warner Bros. DiscoveryOOmnifoldAAstrelyaBuild a scalable transaction-reporting query with event deduplication, monthly aggregation, and month-over-month metrics.
MastercardCompare Tableau, Power BI, and other BI tools using SQL usage and scalability metrics.
T Mobile UsReplace quadratic duplicate detection with a scalable linear-time algorithm using a hash set.
DatadogProcess a numeric stream in one pass and compute each complete sliding-window average with bounded memory.
SnowflakeImplement O(n) order-preserving deduplication using a hash set instead of repeated linear membership checks.
AppleReturn the k most frequent integers using frequency counting and a bounded heap for scalable performance.
PerficientRefactor a metric aggregation function for clearer structure and linear-time processing with a map.
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