Question 1

Can you share an example of a project you worked on that had a significant impact on your organization?

Accepted Answer

**STAR**: **Situation**: 60% of reports had data quality issues. **Task**: Build data quality framework. **Action**: Implemented Great Expectations + dbt tests. Integrated in Airflow; automated alerts. **Result**: Errors dropped 80%; faster detection....

Question 2

Deadlock Prevention - how deadlocks occur and how to prevent them

Accepted Answer

**Prevention**: Acquire locks in consistent order. Use timeouts. Keep transactions short. Avoid holding locks during I/O. **Detection**: Lock wait graphs. **Resolution**: Kill one transaction. **Best practice**: Design for no circular wait; document lock order.

Question 3

How did you develop the Datahub using Open Source Projects such as Spline & Datahub?

Accepted Answer

**Components**: Datahub (metadata catalog, lineage, search); Spline (Spark lineage). Spline agents in Spark jobs emit lineage to Spline server; Datahub ingests via API/connectors. Enrich with glossary, ownership, tags. Deploy via Docker/K8s....

Question 4

Serialization vs Deserialization

Accepted Answer

Serialization: Object → bytes (JSON, Avro, Protobuf). Deserialization: Bytes → object. WHY: Storage, transmission. TRADE-OFFS: Avro/Protobuf for schema evolution in Kafka; Parquet for columnar. Spark uses Kryo for shuffles....

Question 5

What do you think about Data uncertainty?

Accepted Answer

Data uncertainty: Missing, measurement error, inconsistency, staleness. Implications: ML—GIGO; analytics—bias; compliance—wrong decisions. Mitigation: DQ frameworks; uncertainty quantification (confidence intervals); provenance; human-in-the-loop....

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Walmart General Interview Questions

Companies asking these questions

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