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Personalis Interview Questions

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

50questions
~7htotal time
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1
CodingStart here. 7 questions · ~56 min
C Function Pointer CallbacksMedium

Tests your C fundamentals and ability to implement extensible callback patterns.

functionsoopPersonalis
Fast Multi-Dimensional Data StructureHard

Tests advanced data structure design for efficient multi-dimensional operations.

Hash TablesData Structuresperformance analysisPersonalis
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2
Execution11 questions · ~88 min
Troubleshoot Distributed DB BottlenecksHard

Tests your systematic debugging skills for latency, throughput, and resource contention.

database optimizationTroubleshootingbottlenecksPersonalis
AWS Backend for Lab WorkflowsHard

Tests your ability to build and operate reliable cloud services supporting lab workflow execution.

monitoringdesign systemcloud platformsPersonalis
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3
SQL & Data Manipulation4 questions + 3 drills · ~62 min
Illumina Formats and MetricsHard

Evaluates your ability to reason across NGS file formats and variant-calling performance metrics.

Personalis
Tabular QC for TSV DataMedium

Tests practical data validation and quality control for bioinformatics-ready tables.

Data QualityPersonalis
Streamline Month-End Report RefreshMedium
Practice
Practice drill

Use joins, date filtering, and aggregation to produce a faster month-end report from cleaned transaction data.

Data WranglingETLAutomationASI (Advertising Specialty Institute)
SQL Data Quality ChecksHard
Practice
Practice drill

Detect missing fields, duplicate transaction keys, invalid amounts, and merchant reference issues with PostgreSQL CTEs and joins.

Data Qualitynull handlingdata integritySigmoid
Validate Migration Reconciliation MetricsMedium
Practice
Practice drill

Use CTEs, joins, aggregations, and CASE to reconcile legacy and warehouse totals for a migration batch.

data validationdata integritycloud platformsAccenture
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4
Behavioral & Leadership26 questions · ~208 min
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5
More topics2 questions · ~16 min
AWS Secrets and Deployment PipelinesMedium

Tests your cloud engineering practices for secure configuration and reliable deployments.

InfrastructuredeploymentawsPersonalis
Scalable Genomic Pipeline in LIMSHard

Tests your end-to-end pipeline design for data ingestion, validation, and traceability in LIMS.

Data QualityETLOrchestrationPersonalis

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