**Layers**: (1) Block public access (account + bucket). (2) Encryption at rest—SSE-S3 or SSE-KMS. (3) Bucket policies—least privilege. (4) Versioning for recovery. (5) MFA delete for critical buckets. (6) VPC endpoints—no public internet. (7) CloudTrail for audit. (8) Macie for discovery. (9) Lifecycle policies—retention....
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 Capco. The answer also includes follow-up discussion points that interviewers commonly explore.
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