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What are the different data sources you have used?

General/Otherhard0.2 min readPremium

Databases (Postgres, Oracle—CDC, bulk). APIs (REST, GraphQL). Files (CSV, JSON, Parquet on S3/GCS). Streaming (Kafka, Kinesis). SaaS (Salesforce, Stripe via Fivetran). Data lakes (Delta, Iceberg). Legacy (mainframe, FTP). Tailor to experience....

🤖 Analyze Your Answer
Frequency
Low
Asked at 1 company
Category
243
questions in General/Other
Difficulty Split
151E|43M|49H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Cognizant

Why This Question Matters

This hard-level General/Other question appears frequently in data engineering interviews at companies like Cognizant. While less common, it tests deeper understanding that distinguishes strong candidates.

How to Approach This

This is a senior-level question that tests architectural thinking. Lead with the high-level design, then drill into specifics. Discuss trade-offs explicitly - there is rarely one correct answer. Show awareness of scale, fault tolerance, and operational complexity.

Expert Answer
38 words

Databases (Postgres, Oracle—CDC, bulk). APIs (REST, GraphQL). Files (CSV, JSON, Parquet on S3/GCS). Streaming (Kafka, Kinesis). SaaS (Salesforce, Stripe via Fivetran). Data lakes (Delta, Iceberg). Legacy (mainframe, FTP). Tailor to experience. Show variety and patterns (CDC, pagination, idempotency).

The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations covering performance optimization and real-world examples.

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According to DataEngPrep.tech, this is one of the most frequently asked General/Other interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.

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