Top 50 real-time data Interview Questions
The most frequently asked real-time data questions across all roles and companies, ranked by real interview frequency. Updated daily.
Maintain moving mean and tie-broken mode for AKUNA Capital price data using a deque, frequency map, and lazy max heap.
AKUNA CAPITALUse a sliding window and deque to find the densest burst of Splunk error events in a realtime stream.
SplunkCompute rolling averages from ordered stream measurements using an O(n) sliding window.
Amazon Web ServicesDeduplicate chronological metric updates within fixed time windows using hash maps to reduce dashboard render work.
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Design a fault-tolerant real-time ingestion and ML processing system with low latency, scalable state, and reliable downstream outputs.
Snowflake
Viasat
TatariDesign a fault-tolerant, low-latency ingestion pipeline with real-time validation, ML quality checks, and replayable processing.
CACI
AscendionDDigital RealtyDesign a real-time Uber interaction schema and summarize each user's interaction activity, including users with no recorded events.
UberDesign a safe, low-latency RAG pipeline that grounds surgical-system responses in current, authorized data.
Intuitive SurgicalMM3 USAUse ranking to return the nth distinct salary from an employee table.
CiscoBuild a SQL aggregation pipeline that produces customer order metrics while handling joins, filtering, nulls, and implementation trade-offs.