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Updated weekly · Last refresh Aug 30

Diligent Tec Software Engineer Interview Questions

The questions to prepare for a Diligent Tec Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

25questions
~4htotal time
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1
CodingStart here. 7 questions · ~62 min
Merge Two Sorted Linked ListsEasy
Practice

Merge two sorted singly linked lists into one sorted list by relinking existing nodes.

RecursionLinked ListsSortingDiligent Tec
LRU Cache Data StructureMedium

Tests your knowledge of caching design and the right data structures for O(1) operations.

Hash TablesLinked ListsHeapDiligent Tec
Dynamic Programming Problem SolvingHard

Tests your ability to apply dynamic programming and communicate correct reasoning.

RecursionDynamic ProgrammingArraysDiligent Tec
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2
Execution8 questions · ~71 min
Authentication in Distributed SystemsHard

Tests your approach to secure identity, session management, and distributed auth flows.

Trade-offsRisk AssessmentScope ManagementDiligent Tec
Load Balancing in CloudMedium

Tests your knowledge of scaling strategies and traffic distribution for reliability.

Launch PlanningTrade-offsRisk AssessmentDiligent Tec
Diagnosing Web App PerformanceMedium

Tests your troubleshooting process using metrics, profiling, and systematic isolation.

Trade-offsOwnershipRisk AssessmentDiligent Tec
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3
Behavioral & Leadership9 questions · ~80 min
Leading Through an Ambiguous Project CrisisMedium

Tests ownership under ambiguity: how you prioritize, align stakeholders, and recover a project when the path forward is unclear.

CommunicationOwnershipDealing With AmbiguityDiligent Tec
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4
More topics1 question · ~9 min
Database Schema Design FactorsMedium

Tests data modeling skills including normalization, indexing, and query patterns.

JoinsGroup ByData ModelingDiligent Tec
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Second Highest Trader SalaryEasy
Practice
Practice drill

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingeClinicalWorksInformaticaSpectraforce Technologies
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
Conversion Rate by Channel SegmentMedium
Practice
Practice drill

Use joins, a CTE, and aggregation to compute 30-day conversion rate by acquisition channel and customer segment.

JoinsGroup ByCase WhenMotiveHelloFreshBartech Staffing
The finish line: interview-readyComplete all 25 questions plus 3 hands-on drills to finish this plan.