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RAG and Vector Databases Interview Questions | Buncho

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Python for AI/ML75 Machine Learning Fundamentals10 ML Algorithms0 ML System Design1 Deep Learning5 Statistics and Mathematics1 Generative AI and LLMs122 Embeddings13 RAG and Vector Databases47 AI Agents and Tool Calling50 MCP0 Multimodal AI29 LLM Evaluation and Testing27 AI Safety, Ethics, and Responsible AI36 AI System Design41 Fine-Tuning25 AI Infrastructure and Scalability29 LLM Gateways0 Production AI Engineering39 AI Engineering Case Studies15

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RAG and Vector Databases interview questions

Retrieval pipelines, embeddings, and grounding.

All topics565 Python for AI/ML75 Machine Learning Fundamentals10 ML Algorithms0 ML System Design1 Deep Learning5 Statistics and Mathematics1 Generative AI and LLMs122 Embeddings13 RAG and Vector Databases47 AI Agents and Tool Calling50 MCP0 Multimodal AI29 LLM Evaluation and Testing27 AI Safety, Ethics, and Responsible AI36 AI System Design41 Fine-Tuning25 AI Infrastructure and Scalability29 LLM Gateways0 Production AI Engineering39 AI Engineering Case Studies15

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47 problems

See how often each question is asked, and which companies asked it.Part of Buncho Pro.Unlock

TitleTopicTypeTimeAsked Companies Level

Not started1.How do you evaluate a RAG system? Explain faithfulness, relevance, and context precision/recallRAG and Vector Databases · Conceptual · 12 min

Asked %

Companies

RAG and Vector Databases

Conceptual

12 min

Pro feature

Pro feature

Medium

Not started2.Your vector database for RAG is consuming too much memory. How do you reduce it?RAG and Vector Databases · Debugging · 10 minAsked %CompaniesRAG and Vector DatabasesDebugging10 minPro featurePro featureMedium

Not started3.Your RAG system struggles with PDFs containing tables and complex layouts. How do you fix PDF parsing?RAG and Vector Databases · Debugging · 11 minAsked %CompaniesRAG and Vector DatabasesDebugging11 minPro featurePro featureMedium

Not started4.What are the common failure modes of RAG systems, and how do you debug them?RAG and Vector Databases · Debugging · 12 minAsked %CompaniesRAG and Vector DatabasesDebugging12 minPro featurePro featureMedium

Not started5.How does Approximate Nearest Neighbor (ANN) search work, and how do you handle billions of vectors?RAG and Vector Databases · Conceptual · 12 minAsked %CompaniesRAG and Vector DatabasesConceptual12 minPro featurePro featureHard

Not started6.What is query transformation in RAG (HyDE, query decomposition, step-back prompting)?RAG and Vector Databases · Conceptual · 10 minAsked %CompaniesRAG and Vector DatabasesConceptual10 minPro featurePro featureMedium

Not started7.What is parent-child chunking, and how does it improve retrieval?RAG and Vector Databases · Conceptual · 9 minAsked %CompaniesRAG and Vector DatabasesConceptual9 minPro featurePro featureMedium

Not started8.Compare cosine similarity, dot product and Euclidean distance for vector search. Which should you use?RAG and Vector Databases · Conceptual · 9 minAsked %CompaniesRAG and Vector DatabasesConceptual9 minPro featurePro featureMedium

Not started9.What is ColBERT, and how does late interaction retrieval work?RAG and Vector Databases · Conceptual · 10 minAsked %CompaniesRAG and Vector DatabasesConceptual10 minPro featurePro featureHard

Not started10.What is Vectorless RAG?RAG and Vector Databases · Conceptual · 9 minAsked %CompaniesRAG and Vector DatabasesConceptual9 minPro featurePro featureMedium

Not started11.Compare fixed-size, semantic and recursive chunkingRAG and Vector Databases · Conceptual · 9 minAsked %CompaniesRAG and Vector DatabasesConceptual9 minPro featurePro featureMedium

Not started12.Compare reranker architectures: cross-encoder, ColBERT and LLM-based rerankersRAG and Vector Databases · Conceptual · 10 minAsked %CompaniesRAG and Vector DatabasesConceptual10 minPro featurePro featureHard

Not started13.Explain Self-RAG. How does the model decide when to retrieve?RAG and Vector Databases · Conceptual · 10 minAsked %CompaniesRAG and Vector DatabasesConceptual10 minPro featurePro featureHard

Not started14.How would you reduce hallucinations in a RAG application?RAG and Vector Databases · Practical exercise · 15 minAsked %CompaniesRAG and Vector DatabasesPractical exercise15 minPro featurePro featureMedium

Not started15.How do you handle document updates and keep a RAG system fresh and current?RAG and Vector Databases · Practical exercise · 11 minAsked %CompaniesRAG and Vector DatabasesPractical exercise11 minPro featurePro featureMedium

Not started16.What is re-ranking, and how does it improve RAG retrieval quality?RAG and Vector Databases · Conceptual · 9 minAsked %CompaniesRAG and Vector DatabasesConceptual9 minPro featurePro featureMedium

Not started17.Your RAG knowledge base is updated frequently and needs versioning. How do you manage it?RAG and Vector Databases · Practical exercise · 11 minAsked %CompaniesRAG and Vector DatabasesPractical exercise11 minPro featurePro featureHard

Not started18.Your RAG chunk overlap causes redundant results. How do you reduce redundancy?RAG and Vector Databases · Debugging · 9 minAsked %CompaniesRAG and Vector DatabasesDebugging9 minPro featurePro featureMedium

Not started19.Build a basic document parser that extracts text from PDFs and splits it into chunksRAG and Vector Databases · Practical exercise · 18 minAsked %CompaniesRAG and Vector DatabasesPractical exercise18 minPro featurePro featureMedium

Not started20.What is GraphRAG, and when would you use it over traditional RAG?RAG and Vector Databases · Conceptual · 11 minAsked %CompaniesRAG and Vector DatabasesConceptual11 minPro featurePro featureHard

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