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Top 50 data ingestion Interview Questions

The most frequently asked data ingestion questions across all roles and companies, ranked by real interview frequency. Updated daily.

50questions
~9htotal time
221companies covered
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1
SQL & Data ManipulationStart here. 3 questions · ~31 min
Data into SnowflakeMedium
Practice
Recently asked

Summarize Snowflake ingestion activity by source system and load method.

data migrationdata ingestiondata validationSnowflakeSnowflake Computing
Handling Missing Data During IngestionMedium
Practice
Recently asked

Classify raw ingestion records as accepted or rejected while reporting missing and malformed fields safely.

missing valuesData Qualitydata cleaningMedpace
Deduplicate Fact Table IngestionMedium
Practice

Return only the newest unseen fact row for each natural key during ingestion.

Data Qualityfact tablesdata cleaningFactored
2
Coding5 questions · ~52 min
Profile and Optimize Python IngestionHard
Practice

Process ingestion records in bounded chunks to reduce memory use while preserving linear execution time.

CodingData Structuresdata ingestionAdobeTTikTok USDS JV
Flatten Nested JSON for WarehousingHard
Practice

Recursively flatten nested Uber JSON objects into dot-delimited keys while preserving arrays and scalar values.

ArraysData Structuresdata ingestionUber
Ingest JSONMedium
Practice

Parse JSON orders, validate nested items, and flatten them into normalized records for downstream processing.

CodingArraysdata ingestionWalmart Global Tech
Ingest and Transform to WarehouseMedium
Practice
Recently asked

Normalize raw records, retain the latest duplicate, and produce sorted target records.

deduplicationETLData StructuresThe Boston Consulting Group
Ingesting Unstructured API PayloadsHard
Practice

Normalize inconsistent financial API records, skip malformed entries, and deduplicate transactions efficiently.

deduplicationapi integrationapiBrex

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3
System Design42 questions · ~438 min
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