Designing Data Intensive Applications is 600 pages, but very readable.
100 page Machine Learning book is also pretty good.
A Philosophy of Software Design is short, and opinionated as such books go. I liked it - it articulates a few concepts that we encounter in our daily work and don’t really learn about in school. You don’t have to agree with what the author says, but by engaging with the ideas presented at least you will know what you have internalized about this business of writing code.