**Situation:** I started as a software engineer building APIs and moved into ETL and data modeling. I’ve been focused on cloud data platforms for several years and have built systems for e-commerce, finance, and healthcare.
**Task:** Articulate my evolution and how each phase shaped my current approach to data engineering.
**Action / Journey:** (1) **On-prem Hadoop** — MapReduce, Hive, HBase. Learned scale limits of batch and the importance of partitioning and compression....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like Capgemini. The answer also includes follow-up discussion points that interviewers commonly explore.
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