It started at 2am with one runaway client. A hands-on walk through rate limiting — from a naive counter to a distributed token bucket that holds up across a fleet — with a live simulator you can go break yourself.
A simple, real-world explanation of why backend systems exist, focusing on browser sandboxing, security, compute limits, and trust boundaries.
A simple, real-world explanation of Singleton and Factory design patterns using practical JavaScript examples.
A simple Comparison of WebSockets, Server-Sent Events (SSE), and Polling, explained with relatable examples.