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NTT DATA Interview Questions

The questions to prepare for NTT DATA interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

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1
CodingStart here. 5 questions · ~52 min
Design an LRU CacheEasy
Practice
Recently asked

Implement an LRU cache in O(1) average time using a hash table and doubly linked list.

Hash TablesQueueLinked ListsNTT DATA
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2
SQL & Data Manipulation5 questions + 1 drill · ~62 min
Second Highest Without AggregatesHard
Practice

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

SubqueriesRankingSelf-JoinsNTT DATA
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
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3
Execution5 questions · ~52 min
Recover a Slipping ProjectMedium
Recently asked

Explain how you would diagnose and recover a project that is falling behind schedule without losing stakeholder trust.

Success CriteriaRoadmappingRisk AssessmentNTT DATA
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4
Machine Learning5 questions · ~52 min
Bias-Variance Tradeoff in PracticeMedium

Explain the bias-variance tradeoff and how it guides model choice, regularization, and generalization performance.

Cross-ValidationBias-Variance TradeoffRegularizationNTT DATA
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5
Metrics4 questions · ~42 min
Diagnose KPI Drop After ReleaseMedium

Diagnose a post-release KPI drop by separating instrumentation issues from real behavior changes and tracing the problem through the metric hierarchy.

KPILeading IndicatorsDiagnosisNTT DATA
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6
System Design5 questions · ~52 min
Design an LLM Serving PlatformHard

Design an LLM serving system that balances latency, cost, scalability, and safety for production traffic.

Cold StartFeature StoreModel ServingNTT DATA
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7
More topics21 questions · ~219 min
Pitfalls in Streaming Experiment AnalysisHard

Identify major online experiment pitfalls and explain how they can bias results in a streaming product A/B test.

Network InterferenceNovelty EffectSample Ratio MismatchNTT DATA
IaC for Pipeline InfrastructureMedium
Recently asked

Explain how you use IaC to provision and manage pipeline infrastructure consistently across environments.

InfrastructureOrchestrationDependenciesNTT DATA
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The finish line: interview-readyComplete all 50 questions plus 1 hands-on drill to finish this plan.