Posts tagged "system design"

Published on: May 25, 2026

I Built a Horizontal Scaling Lab on My Laptop. Here's What It Taught Me

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Most engineers understand horizontal scaling in theory, but very few have felt it running on their own machine. Here is how I built a minimal horizontal scaling lab using Docker Compose and NGINX.

MCP Sampling: Tools Aren't Just Fancy API Wrappers

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Most people think MCP tools are just fancy API wrappers. But with Sampling, tools can think mid-task, changing how autonomous agents communicate and adapt.

How Amazon Prevents Double-Selling: Row-Level Locking

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Imagine Alice and Bob clicking buy on the last iPhone at the exact same millisecond. Without proper database transaction isolation, you get double-selling. Here is how row-level locking solves it.