**Situation**: Context of the challenge. **Task**: Your responsibility. **Action**: Specific steps, tools, collaboration. **Result**: Quantified outcome. Walmart's scale in retail and supply chain creates unique data engineering challenges: billions of transactions, real-time inventory, and omnichannel analytics. The opportunity to build systems that directly improve customer experience and operational efficiency is compelling....
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 Walmart. The answer also includes follow-up discussion points that interviewers commonly explore.
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