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Updated weekly · Last refresh Sep 20

ADP Full Stack Engineer Interview Questions

The questions to prepare for a ADP Full Stack Engineer interview. Questions from real interview reports rank first. Updated daily.

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1
Technical FundamentalsStart here. 10 questions · ~89 min
Runnable vs CallableMedium

Evaluates concurrency fundamentals and API choice.

oopADP
Cyclic DependenciesMedium

Assesses dependency management and modular design.

oopADP
Exception vs ErrorMedium

Tests knowledge of exception handling and fault tolerance.

error handlingADP
Static Class vs Static MethodEasy

Tests understanding of core object-oriented concepts.

oopADP
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2
More topics4 questions · ~35 min
SQL Highest Salary Per DepartmentMedium
Practice

Find each department's maximum salary and all employees tied at that salary using LEFT JOINs and a correlated subquery.

sqlAggregationsADP
Microservices CommunicationHard

Tests system design for distributed components and messaging.

system designCommunicationmicroservicesADP
Filters and InterceptorsMedium

Tests middleware-like extension points and request processing.

ADP
OAuth BasicsMedium

Assesses understanding of delegated authorization.

authenticationSecurityADP

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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Validate Bank Reconciliation CompletenessHard
Practice
Practice drill

Compare ledger and bank transactions to flag unmatched items and reconciliation gaps.

Data WranglingReconciliationAggregationsADP
LEFT JOIN for Missing RecordsEasy
Practice
Recently asked
Practice drill

Use a LEFT JOIN to return students who have no corresponding marks records.

missing valuesnull handlingJoinsADP
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