Role
Data Engineer
Real interview questions with expert answers, plain-English explanations, and practical examples. (26 questions)
Tech Mahindra
Data Engineer
Data Structures & Algorithms
How would you choose the optimal data structure for real-time analytics on a high-velocity data stream?
Mphasis
Data Engineer
Security
How do you ensure the security and compliance of sensitive data within a modern data pipeline?
Uber
Data Engineer
Data Structures & Algorithms
When would you use a Merkle Tree in a data pipeline, and what benefits does it provide for data integrity?
Deloitte
Data Engineer
Data Structures & Algorithms
Explain the HyperLogLog algorithm, and how would a data engineer use it to estimate unique counts for massive datasets?
Cognizant
Data Engineer
Data Structures & Algorithms
Explain the differences between Bloom filters and Count-Min sketches, and when would a data engineer use each for approximate analytics?
ServiceNow
Data Engineer
Performance Optimization
A critical batch data pipeline is experiencing significant delays. How would you diagnose and optimize its performance?
LTIMindtree
Data Engineer
Message Queues
How do message queues handle consumer scaling and failure scenarios in a high-throughput data pipeline?
Flipkart
Data Engineer
Performance Optimization
How would you optimize a large-scale ETL pipeline for both cost and speed in a cloud environment?
ServiceNow
Data Engineer
Data Structures & Algorithms
How does a segment tree efficiently handle range queries and updates, and what are its practical applications in data engineering?
Zomato
Data Engineer
Security