Top 37
Prep plan
Updated weekly · Last refresh Aug 30

Inc. In Data Engineer Interview Questions

The questions to prepare for a Inc. In Data Engineer interview. Questions from real interview reports rank first. Updated weekly.

37questions
~6htotal time
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1
CodingStart here. 4 questions · ~39 min
Palindrome Checker FunctionEasy
Practice

Check whether a string is a palindrome after ignoring case and non-alphanumeric characters using two pointers.

Hash TablesStringsTwo PointersInc. In
Merge Two Sorted ArraysEasy
Practice

Merge two sorted arrays into one sorted array using a two-pointer linear scan.

ArraysSortingTwo PointersInc. In
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2
SQL & Data Manipulation8 questions + 1 drill · ~87 min
7-Day Rolling Active UsersMedium
Practice

Compute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.

Window FunctionsDate FunctionsRunning TotalsInc. In
SQL Duplicate DetectionEasy
Practice

Find duplicate customer profiles by grouping on identifying fields and returning only repeated records.

Group ByHavingAggregationsInc. In
Window Ranking in Ticket QueuesMedium

Explain SQL window functions and when to use ROW_NUMBER() versus DENSE_RANK() for ranked ticket analysis.

Window FunctionsRankingrow_numberInc. In
Window Functions and Top SalariesEasy
Practice
Practice drill

Use ROW_NUMBER and a CTE to return the three highest-paid employees in each Inc. In department.

Window FunctionsInc. In
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3
Pipelines15 questions · ~145 min
Handling Missing Data in PipelinesMedium

Approach for handling missing data in an ML data pipeline, including validation, imputation, and safe downstream consumption.

InfrastructureETLBatch ProcessingInc. In
Diagnose an Integration Pipeline IssueMedium

Structured approach to diagnose failures in an ETL integration, from source extraction through orchestration, data quality, and idempotent recovery.

ToolsDependenciesQualityInc. In
Design Real-Time Operations Dashboard PipelineHard

Design a pipeline for a real-time operational dashboard, covering streaming ingestion, modeling, data quality, and dashboard serving.

InfrastructureStream ProcessingQualityInc. In
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4
Behavioral & Leadership10 questions · ~97 min
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The finish line: interview-readyComplete all 37 questions plus 1 hands-on drill to finish this plan.