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Updated weekly · Last refresh Oct 17

Persistent Systems Forward-Deployed Engineer Interview Questions

The questions to prepare for a Persistent Systems Forward-Deployed Engineer interview. Questions from real interview reports rank first. Updated daily.

23questions
~3htotal time
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1
CodingStart here. 4 questions · ~36 min
Linked List ReversalEasy
Practice

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

RecursionLinked ListsArraysPersistent Systems
Optimizing Sorting for Large DatasetsMedium

Explain how to choose and optimize sorting approaches for large datasets based on memory, data distribution, and stability requirements.

ArraysSortingGreedyPersistent Systems
Shortest Path in a GraphHard

Tests algorithm selection and implementation for shortest path problems.

QueueSearchingGraphsPersistent Systems
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2
Execution7 questions · ~62 min
Escalate and Contain Critical BugEasy

Describe how you handled a critical bug by assessing risk, aligning stakeholders, defining severity, and driving containment to resolution.

Success CriteriaRisk AssessmentQualityPersistent Systems
Reliability and Fault ToleranceHard

Tests resilience engineering practices including failure handling and recovery strategies.

Trade-offsSuccess CriteriaRisk AssessmentPersistent Systems
Architectural Pattern Trade-OffsMedium

Tests architecture reasoning and ability to choose patterns based on constraints.

Trade-offsRisk AssessmentScope ManagementPersistent Systems
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3
Behavioral & Leadership11 questions · ~98 min
Responding to Tough FeedbackEasy

Tests how you handle constructive criticism with self-awareness, ownership, and visible improvement over time.

CommunicationOwnershipDealing With AmbiguityPersistent Systems
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4
More topics1 question · ~9 min
Database Schema DesignMedium

Tests data modeling, constraints, and scalability considerations.

JoinsData WranglingGroup ByPersistent Systems
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Compare Two Tables in SQLMedium
Practice
Practice drill

Compare Persistent QA pipeline records across tables and report missing or mismatched test data using a full outer join.

JoinsData WranglingAggregationsPersistent Systems
Handling Missing DataMedium
Practice
Practice drill

Standardize missing observation fields with fallback values, missingness flags, and ordered output.

Window Functionsmissing valuesdata cleaningEversource EnergyCincinnati Children's HospitalAdtalem Global Education
Optimize Slow SQL QueriesMedium
Practice
Recently asked
Practice drill

Demonstrate a PostgreSQL approach for optimizing a filtered aggregation query over related tables.

Subqueriesdatabase optimizationJoinsBoeing Intelligence & AnalyticsRRM Design & EngineeringWaymo
The finish line: interview-readyComplete all 23 questions plus 3 hands-on drills to finish this plan.