Ask HN: How to study for system design that doesn't include front end/back end?

I got a system design interview where I was asked to build a pricer for a financial product, then expand it to multiple pricers that might share inputs. This was not the typical system design interview where you have to deal with APIs / load balancers / latency / etc I have studied that a lot, but what about these type of general interviews? ... Read full article.