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Vast Interview Questions

The questions to prepare for Vast interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

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1
System DesignStart here. 4 questions · ~32 min
Real-Time Monitoring API DesignHard

Tests your ability to design scalable real-time APIs with concurrency, latency, and reliability in mind.

api designconcurrencyVast
Integrating Software With CAD ProcessesMedium

Evaluates your experience bridging software systems with hardware workflows and data formats.

Vast
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2
Execution5 questions · ~40 min
Refactoring for ScalabilityMedium

Assesses your engineering judgment and impact when modernizing legacy systems.

refactoringscalabilitylegacy systemsVast
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3
More topics7 questions · ~56 min
Time-Series Database Trade-offsMedium

Assesses how you evaluate storage and query options for time-series workloads.

Trade-offstime-series datadatabase architectureVast
Low-Latency Memory ManagementMedium

Evaluates your understanding of performance-focused memory management techniques.

memory managementInfrastructurelow latencyVast
Scalable Telemetry Pipeline DesignMedium

Tests your ability to scale telemetry pipelines for throughput, latency, and reliability.

data pipelinescalabilitytelemetryVast
Pairwise Testing ExplanationMedium

Evaluates your ability to explain a testing strategy and apply it with a concrete example.

TestingVast
Database Architecture Trade-offsMedium

Tests your ability to choose and justify database architectures for high availability requirements.

Trade-offshigh availabilitydatabase architectureVast
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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
SQL Duplicate Record DetectionEasy
Practice
Practice drill

Find duplicate American Institutes for Research assessment submissions using a CTE, GROUP BY, HAVING, and joins.

deduplicationsqldata integrityAmerican Institutes for ResearchMacy's
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
The finish line: interview-readyComplete all 16 questions plus 3 hands-on drills to finish this plan.