Data engineering interview questions · hard
Glue ETL optimization: Performance improvement strategies?
Handling Large-Scale Data Ingestion in AWS Pipelines
How did you contribute to cost optimization initiatives while working with cloud technologies?
How do you handle cost optimization in AWS EMR clusters?
How do you optimize resource allocation in a Dataflow job to reduce costs?
How would you design a data pipeline using AWS Glue, S3, and Redshift?
How would you handle security and privacy concerns when working with sensitive data in a cloud environment?
How would you implement VPC peering between two AWS accounts?
How would you monitor a data pipeline in AWS to ensure SLA compliance?
How would you secure sensitive credentials in Cloud Composer workflows?
How would you use Amazon Glue to merge small files?
In AWS Data Pipeline, how would you design a process to copy only recently modified files from one S3 bucket to another?
Moving pipelines from development to production: ARM templates for deployment.
On-Premises to Cloud Integration Runtime
Parallel Copies in ADF?
Provide Data Pipeline for GCP Data Engineering
Synapse Analytics Features and Use Cases?
Unity Catalog - role in managing and securing data
Using Service Accounts in GCP
What GCP tools do you use?
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Learn the platform used by your target companies. AWS is most common overall (Glue, Redshift, S3, Kinesis). GCP is preferred by Google and startups (BigQuery, Dataflow, Pub/Sub). Azure is dominant in enterprise (Synapse, Data Factory). Learn one deeply and understand the equivalents on others.
Core tools: SQL, Python, Spark, Airflow (or equivalent orchestrator), one cloud platform. Increasingly important: dbt, Kafka, Terraform, Docker/Kubernetes, Delta Lake or Apache Iceberg, a data observability tool. The specific stack varies by company.
Yes. Apache Airflow is the most widely used orchestration tool and questions about DAG design, task dependencies, XComs, operators, and failure handling are common. If the company uses a different orchestrator, expect similar questions adapted to their tool.