Justin HendrixNov 19, 2022
Elon Musk tweeted an image on a whiteboard from a "Twitter HQ code review" that wrapped up early Saturday. The image has attracted nearly 12k upvotes and over 1,000 comments over at the subreddit r/ProgrammerHumor, under the title "Twitter for Dummies". The image itself is an architecture schematic, not code. I put it on a Miro Board and Luke Dubois and Mark Hansen helped annotate it. If you're curious how Twitter's bits work, check it out here: https://miro.com/app/board/uXjVPBnTJmM=/?share_link_id=748653261357
Twitter Architecture

miro.com
Show threadChristie DudleyNov 20, 2022
@justinhendrix This is great and all, but don't you think this is something that should have been done first before anyone was fired?
Show threadKeith Soltys
@longobord @justinhendrix There should already have been documentation of all of this. But of course all the technical writers/architects are probably gone.
Nov 20, 2022 at 12:34amWeb
Show threadChristie DudleyNov 20, 2022
@ksoltys @justinhendrix I don't doubt that there was never a "big picture" view like this back when they had people to do documentation. It is rare that anyone not intimately familiar with one or more systems would need to know it.
Show threadKeith SoltysNov 20, 2022
@longobord @justinhendrix I worked on architectural docs in my last job at the Toronto Stock Exchange. They were mainly for knowledge transfer and to satisfy regulatory oversight requirments. They were also helpful for QA and troubleshooting.