Role
Data Engineer
Real interview questions with expert answers, plain-English explanations, and practical examples. (43 questions)
Salesforce
Data Engineer
Databases
How would a Salesforce Data Engineer design and implement a robust data partitioning strategy for a large-scale analytical database, ensuring optimal query performance and data retention policies?
PayPal
Data Engineer
Databases
As a PayPal data engineer, how would you design a scalable and robust data warehouse schema to support analytical queries for financial transaction data?
LinkedIn
Data Engineer
Performance Optimization
How would a LinkedIn Data Engineer optimize a large-scale data ingestion pipeline for performance and cost?
Adobe
Data Engineer
Message Queues
An existing Adobe real-time data ingestion pipeline, built on message queues, is experiencing intermittent message loss and order violations. As a data engineer, how would you diagnose these issues and implement solutions to ensure data integrity and correct ordering?
Meta
Data Engineer
Data Structures & Algorithms
A Meta data pipeline processes real-time clickstream data, needing to identify unique visitors within a 15-minute rolling window. How would you design a data structure and algorithm to efficiently track unique visitor IDs, supporting both additions and automatic expiration?
Salesforce
Data Engineer
Message Queues
A Salesforce data engineer needs to build a scalable and fault-tolerant real-time data processing system. How would you design this using message queues to handle high throughput and ensure data durability?
Tech Mahindra
Data Engineer
Message Queues
A Tech Mahindra data engineer needs to build a scalable and fault-tolerant data ingestion pipeline. How would you design this using message queues, ensuring reliable delivery and processing?
Microsoft
Data Engineer
Data Structures & Algorithms
A Microsoft data engineer needs to count unique users from a high-volume, real-time event stream. How would you choose and implement appropriate data structures for efficient, approximate cardinality estimation?
Deloitte
Data Engineer
Performance Optimization
A critical Deloitte data pipeline is failing to meet its SLAs due to performance bottlenecks. As a Data Engineer, how would you approach diagnosing and optimizing its end-to-end performance, from ingestion to consumption?
Microsoft
Data Engineer
Machine Learning