AWS for Newbies — Episode 2

Short summary

Production-ready AWS S3 patterns: organize uploads by type using key prefixes (no real folders exist), detect and eliminate duplicate files via SHA-256 content hashing, and issue presigned URLs with real expiry policies for security. The Uncle-Nephew dialogue implements a memory-efficient streaming hash function in Node.js, explains why hashing filenames prevents overwrites and deduplication, and covers multi-user key isolation strategies. Complete code examples and fundamentals for building scalable applications.

• •S3 uses flat key structure with prefix-based organization, not real folders
• •SHA-256 content hashing enables deduplication across identical file uploads
• •Streaming hash implementation in Node.js prevents memory spikes on large files

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