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Updated weekly · Last refresh Aug 30

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 weekly.

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
Designing MicroservicesHard

Tests microservices design thinking including boundaries, communication, and operational concerns.

Trade-offsRoadmappingRisk AssessmentPersistent Systems
Reliability and Fault ToleranceHard

Tests resilience engineering practices including failure handling and recovery strategies.

Trade-offsSuccess CriteriaRisk AssessmentPersistent Systems
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3
Behavioral & Leadership11 questions · ~98 min
Prioritizing Across Competing Client ProjectsEasy
Recently asked

Tests prioritization under pressure across multiple projects, including trade-off judgment, stakeholder communication, and ownership of outcomes.

OwnershipPrioritizationPersistent 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
Finding Duplicate RecordsEasy
Practice
Practice drill

Find duplicate customer emails using GROUP BY and HAVING in PostgreSQL.

Group ByHavingAggregationsWestern DigitalBismartUniversity of Kansas Medical Center
Second Highest Without AggregatesHard
Practice
Recently asked
Practice drill

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCredit GenieDevoteamCisco Restaurant + Bar
The finish line: interview-readyComplete all 23 questions plus 3 hands-on drills to finish this plan.