Question 1

What aspects of our business model excite you the most?

Accepted Answer

Research company. 'Excited by [business model]. [Company] uses data to [differentiate]—aligns with building infra that drives impact. [Product/initiative] interesting because [reason]. Would contribute to [aspect].' Genuine interest; specific; connect to skills.

Question 2

Describe a situation where you had to redesign a data model to meet changing business needs

Accepted Answer

**Section 1 — The Context (The 'Why')**
The primary challenge for this design in SQL is balancing scale, cost, and reliability. At scale, naive approaches fail: single points of failure cause cascades, schema evolution breaks consumers, and over-provisioning explodes cost. Failure modes include silent data loss from non-idempotent writes, cascading job failures from tight coupling, and operational burden from manual intervention....

Question 3

Write an SQL query to find the top 3 performing products in each category

Accepted Answer

SELECT category, product_id, product_name, sales FROM (SELECT category, product_id, product_name, sales, ROW_NUMBER() OVER (PARTITION BY category ORDER BY sales DESC) AS rn FROM products) ranked WHERE rn <= 3. **Why**: Define 'performing' (revenue, units, margin). Consider time window (e.g., last 90 days). **Scalability**: Pre-aggregate in mart for dashboards....

Question 4

Perform EDA on a dataset and summarize your findings in a business context

Accepted Answer

**Why it matters**: At scale, design choices directly impact reliability, latency, and cost. Wrong decisions compound across jobs and teams.

EDA in business context: (1) Load data, check shape, dtypes. (2) Describe stats, nulls, duplicates. (3) Visualize distributions, correlations. (4) Identify: outliers, missing patterns, key segments....

Question 5

Design a schema for a retail store's sales data, explaining your choice of dimensions and facts

Accepted Answer

**Section 1 — The Context (The 'Why')**
This system design addresses "Design a schema for a retail store's sales data, explaining your choice of dimen..." at production scale. The primary challenges are throughput under variable load, fault tolerance across distributed components, and maintaining consistency guarantees that match business requirements....

Kagina Data Engineer Interview Questions

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Kagina Data Engineer Interview Questions

Companies asking these questions

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