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Updated weekly · Last refresh Sep 22

Factual Software Engineer Interview Questions

The questions to prepare for a Factual Software Engineer interview. Questions from real interview reports rank first. Updated daily.

50questions
~8htotal time
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1
CodingStart here. 20 questions · ~190 min
Linked List ReversalEasy
Practice

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysFactual
Longest Substring Without RepeatsMedium
Practice

Find the longest substring with all unique characters using a sliding window.

Hash TablesStringsTwo PointersFactual
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2
Pipelines7 questions · ~67 min
Design an ETL Pipeline for Large DatasetsMedium

Design an ETL pipeline to process 10TB of data daily from multiple sources into a data warehouse with strict data quality checks.

InfrastructureETLData ModelingFactual
Fault Tolerance in Data PipelinesHard

Approach for building fault tolerance into a distributed data pipeline, including retries, idempotency, and recovery controls.

InfrastructureIdempotencyQualityFactual
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3
SQL & Data Manipulation6 questions + 3 drills · ~87 min
Manipulate Data and RenderMedium

Evaluates end-to-end thinking from data transformation to usable outputs.

Data ManipulationrenderingFactual
Join Tables With SQLEasy
Practice
Practice drill

Retrieve valid activity records with filtering, NULL-safe behavior, and deterministic ordering.

null handlingJoinsData ManipulationFactual
Running Total With Window FunctionsEasy
Practice
Practice drill

Calculate each user's running order total over time using a window function.

Window FunctionsDate FunctionsRunning TotalsBayerSparksoftWestern Digital
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
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4
Execution3 questions · ~29 min
Design Intuitive and Efficient APIsMedium

Tests practical experience designing developer-friendly, performant APIs.

Trade-offsSuccess CriteriaScope ManagementFactual
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5
Behavioral & Leadership11 questions · ~105 min
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6
More topics3 questions · ~29 min
Airport Gates MinimumHard

Assesses your ability to model constraints and compute a minimum resource requirement.

Factual
APIs You Have DesignedMedium

Tests ability to communicate technical API design and integration experience.

Stakeholder ManagementCommunicationOwnershipFactual
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The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.