You could do a lot worse than _Trading and Exchanges_ by Larry Harris. The first couple chapters in particular do a fantastic job at giving a laypersons tour of the operations side of trading and finance.
The problem with things like _A Random Walk..._ is that they're geared towards helping independent investors; that's great, but it's not super relevant to a tech career in finance. On the other hand, knowing how shopping a block works: pretty handy.
The problem with things like _A Random Walk..._ is that they're geared towards helping independent investors; that's great, but it's not super relevant to a tech career in finance. On the other hand, knowing how shopping a block works: pretty handy.