Notes
Quick tips, code snippets, and random thoughts. Bite-sized knowledge drops.
Tags:
backend
cdn
computer-science
dash
encoding
event-loop
fundamentals
hashing
hls
javascript
nodejs
system-design
video-streaming
TIL
Dec 25, 2025
Base62, MD5, and SHA-256 — What They Actually Do (Under the Hood)
These three terms — **Base62**, **MD5**, and **SHA-256** — often get mentioned together in system design discussions, even though they solve *very di...
computer-science
encoding
hashing
system-design
fundamentals
TIL
Dec 23, 2025
How HLS / DASH Actually Work (Under the Hood)
Most people describe HLS/DASH as *“adaptive bitrate streaming”* and stop there. That explanation is technically correct, but it hides the real eleg...
system-design
video-streaming
hls
dash
cdn
TIL
Nov 28, 2025
Node.js Event Loop: How It Really Works
Ever wondered how Node.js handles thousands of concurrent connections with a single thread? The secret is the **Event Loop**. ## The Phases The Nod...
nodejs
event-loop
javascript
backend