About
About these notes
Fanout is a place to read through system design decisions slowly, with an example you can reason about and a lesson to watch next.
How the notes are made
These articles bring together ideas from public lessons by Arpit Bhayani and Hello Interview. The numerical examples and scenarios are written for this site. They are exercises, not measurements of those creators’ production systems.
Captions were collected using Apify and read for research. Automatic captions can contain mistakes; ambiguous claims were omitted or qualified. 7 tracks were too garbled for reliable technical extraction and were excluded from article sources. The articles are AI-assisted syntheses, not transcripts or articles written by the source creators.
Follow the source links beside the explanation or at the end of each note to watch the original teaching. The creators are not affiliated with this site and have not reviewed these notes.
Coverage
The source catalog records 315 regular uploads as of 2026-09-22 GST, with 315 available captions and 0 unavailable. Shorts and separate livestream archives were not collected. Raw transcripts and the private course archive are not published here.