Lambda

re:Invent 2025 Day 4: The Infrastructure Behind Agentic AI

When the curtain lifts on infrastructure, you understand why AI has a future at all.

There is a rhythm to a Peter DeSantis keynote.
You sit down expecting a product announcement, and you end up holding a degree-level lecture on why the future of AI rests on the parts nobody sees. This morning at reInvent was exactly that. A full room, a quiet intro, then straight across the boundary between computer science, silicon strategy, and the economics of AI.

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Scan vs Query in DynamoDB: Stop Wasting Read Capacity Units

Let’s talk about one of the most common (and costly) mistakes I see in serverless applications using Amazon DynamoDB: overusing `Scan` when a `Query` would do the job better — faster, cheaper, and more predictably.

Let’s talk about one of the most common (and costly) mistakes I see in serverless applications using Amazon DynamoDB: overusing Scan when a Query would do the job better — faster, cheaper, and more predictably.

“The ‘scan is easier and we don’t need indexes’ anti pattern

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