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Home/Questions/Cloud/Tools/Could you describe a specific cost optimization strategy you implemented in the cloud and its results?

Could you describe a specific cost optimization strategy you implemented in the cloud and its results?

Cloud/Toolshard0.6 min readPremium
Frequency
Low
Asked at 1 company
Category
179
questions in Cloud/Tools
Difficulty Split
104E|27M|48H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Walmart
Key Concepts Tested
bigqueryoptimizationpartition
Expert AnswerPremium
116 wordsInterview-ready
Situation: BigQuery costs spiked 40% in a quarter; ad-hoc queries and unoptimized scans dominated spend. Task: Reduce spend without constraining analysts or degrading UX. Action: I led a cost optimization initiative: (1) Partitioned and clustered high-cardinality columns—event_date, user_id—to cut bytes scanned by ~50%; (2) Implemented slot reservations for predictable workloads; (3) Added query cost attribution via labels and alerts for queries exceeding $50; (4) Created materialized views for...
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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