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Top 50 data persistence Interview Questions

The most frequently asked data persistence questions across all roles and companies, ranked by real interview frequency. Updated daily.

50questions
~8htotal time
72companies covered
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1
CodingStart here. 14 questions · ~133 min
Ingest Nested JSON to DeltaHard
Practice
Recently asked

Recursively flatten nested JSON logs and group normalized records by a partition field for Delta ingestion.

Codingclean codedata persistenceDatabricks
Pickling in PythonEasy
Practice

Serialize and reconstruct JSON-compatible Python objects using pickle serialization and deserialization.

Codingdata persistenceData StructuresInfosys
Automate Server Directory BackupsMedium
Practice

Create a ZIP backup from directory entries and return the requested archive path using Python's standard library.

Hash Tablesbashdata persistenceVTG
Create a movie database backend debug taskHard
Practice

Implement stateful watch-list handlers with authorization, validation, persistence, and correct HTTP-style responses.

clean codedata persistenceapiAmazon
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2
Behavioral & Leadership3 questions · ~29 min
Owning Offline Sync Under AmbiguityMedium

Tests ownership, prioritization, and influence in an ambiguous mobile offline-sync problem with competing technical and product trade-offs.

backend integrationdata persistenceoffline syncSAPAirwallex PtyHopper
Owning Offline Sync ReliabilityMedium

Tests ownership of mobile offline sync problems, including prioritization, backend coordination, and user-impact tradeoffs under unreliable network conditions.

data persistencetechnical experiencebackend syncDatadogLumenaltaSiemens Energy
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3
System Design8 questions · ~76 min
Build a Page With Network and PersistenceHard
Recently asked

Evaluates your ability to design client-side flows with data fetching and persistence.

api designdata persistenceDoorDash
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4
Execution4 questions · ~38 min
Data Persistence and RestorationMedium
Recently asked

Assesses your approach to resilience, backup, and fast recovery.

data persistenceEEPAM India
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5
Technical Fundamentals7 questions · ~67 min
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6
Software Architecture10 questions · ~95 min
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7
More topics4 questions · ~38 min
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Nth Salary SQLMedium
Practice
Recently asked
Practice drill

Use ranking to return the nth distinct salary from an employee table.

system designnull handlingsqlBBirdeyeAkamai
SQL Bookstore Schema PracticeEasy
Practice
Recently asked
Practice drill

Use a CTE, joins, and distinct aggregates to calculate Meta Logistics bookstore payment metrics.

sql queriessqlpythonMeta Logistics
SQL for Employee QueriesMedium
Practice
Practice drill

Use recursive CTEs and anti-join logic to find active VLink employees without a current department.

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