nference Data Engineer Interview Questions
The questions to prepare for a nference Data Engineer interview. Questions from real interview reports rank first. Updated daily.
Use a hash map to find two array elements that sum to a target in O(n) time.
nferenceFind the first non-repeating character in a string using frequency counting and a second pass in O(n) time.
nferenceExplain how the two pointers technique works on arrays and strings, when to use it, and its common patterns.
nferenceExplain OLTP vs OLAP designs, including schema shape, workload patterns, and when each is appropriate in a data platform.
nferenceExplain how clustered and non-clustered indexes differ in storage, lookup behavior, and query performance.
nferenceCalculate seven-day rolling active-user averages for each nference clinical cohort.
nferenceAggregate monthly sales by product category and use LAG to calculate month-over-month changes.
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Approach for detecting and mitigating skew in PySpark pipelines using partitioning, join strategies, and runtime monitoring.
nferenceDesign the core pipeline infrastructure for a new project, with attention to orchestration, data quality, idempotency, and future scale.
nferenceApproach for maintaining data quality and integrity across ETL pipelines.
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