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Updated weekly · Last refresh Aug 30

NTT DATA AI Engineer Interview Questions

The questions to prepare for a NTT DATA AI Engineer interview. Questions from real interview reports rank first. Updated weekly.

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1
CodingStart here. 6 questions · ~62 min
Design an LRU CacheEasy
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Implement an LRU cache in O(1) average time using a hash table and doubly linked list.

Hash TablesQueueLinked ListsNTT DATA
Merge Overlapping Sorted IntervalsMedium
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Sort intervals by start time, then greedily merge overlaps into a non-overlapping result array.

intervalsSortingArray ManipulationNTT DATA
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2
Machine Learning3 questions · ~31 min
Bias Variance and RegularizationMedium

Explain the bias-variance tradeoff mathematically and how L1 and L2 regularization change model complexity and weights.

Bias-Variance TradeoffRegularizationSupervised LearningNTT DATA
Bagging vs Boosting ExplainedMedium

Explain how bagging and boosting differ, and identify a representative algorithm for each ensemble method.

Ensemble Methodsmodel trainingSupervised LearningNTT DATA
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3
System Design4 questions · ~41 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
Design a Low Latency RAG PlatformHard

Design a low latency RAG system over millions of documents, with scalable retrieval, ranking, generation, and production monitoring.

low latencyscalabilityRAG architectureNTT DATA
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4
Generative AI & LLMs9 questions · ~93 min
Evaluate a Grounded Support AssistantMedium

Design an eval-first framework for a grounded LLM assistant, covering quality, hallucination, safety, latency, and cost before scaling.

HallucinationStructured ExtractionLLM EvaluationNTT DATA
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5
Behavioral & Leadership7 questions · ~72 min
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6
More topics2 questions · ~21 min
Complex ETL Pipeline ArchitectureHard

Explain the architecture of a complex ETL pipeline built from scratch, including orchestration, data quality, idempotency, and backfill strategy.

InfrastructureETLData ModelingNTT DATA
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