Overview

The Data Engineering Interview Has Its Own Rules. Most Candidates Don't Know Them. SQL interviews at data science companies test statistics and product sense. Data engineering interviews test something different - whether you can design distributed pipelines that don't break, model data at a scale that makes analysts fast, reason about streaming versus batch trade-offs under pressure, and communicate architectural decisions to people who depend on the infrastructure you build. Most interview preparation resources treat data engineering as a chapter in a data science book. This playbook treats it as the discipline it actually is - with its own interview format, its own technical depth requirements, and its own career trajectory. What's Inside 200+ real questions from FAANG, top startups, and Wall Street - with full answer frameworks for every one SQL at scale - window functions, query optimization, partitioning strategies, and petabyte-scale patterns that warehouse interviews actually test Python and PySpark - data transformation logic, Spark optimization, skew handling, and the production patterns interviewers probe at senior levels ETL and ELT pipeline design - idempotency, atomicity, CDC, late data handling, backfill strategies, and failure recovery Apache Kafka and stream processing - topics, partitions, delivery semantics, Flink versus Spark Structured Streaming, and real-time pipeline design Workflow orchestration - Airflow DAG design, production failure modes, Prefect and Dagster compared Cloud platforms - BigQuery, Snowflake, Redshift, and Databricks at the optimization depth interviews require Data modeling - dimensional modeling, slowly changing dimensions, Data Vault, and schema design for analytical workloads Data quality and observability - data contracts, lineage, Great Expectations, dbt tests, and monitoring strategies System design - the five-stage framework with three complete walkthroughs: real-time analytics platform, ML data infrastructure, and lakehouse migration AI and ML integration - feature stores, embedding pipelines, RAG architecture, and vector databases Senior and staff strategy - technical leadership, organizational influence, and salary negotiation Who This Is For This playbook is written for the analyst or data scientist transitioning into data engineering, the working data engineer targeting a step up at a better company, and the international candidate preparing for a FAANG data engineering loop - everyone who needs to translate genuine technical skill into interview-winning performance. ""The only data engineering interview book I found that actually covers what 2026 interviews test. The system design walkthroughs alone are worth the price."" ""I used this to prep for my Databricks loop. The pipeline design and Kafka chapters are the most thorough treatment I've seen outside of internal documentation."" Book 2 of The Complete Tech Interview Series. If you have a data engineering interview in the next 90 days - this is the book you need.

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