World Scale Bingo
Ever wanted to play word based Bingo with a few billion of your friends?
SomeCodingGuy did - and the journey from botbingo, a 5 RPS in a simple python3 Flask development server to a highly tuned 10,000 RPS screaming fast Apache2 loadable C bingo-board-generating-monstrosity shows you how to take a web app from supporting a few people to handling the whole world on a shoestring budget.