You put a load balancer here, a cache there, 3 instances there and there. Should I use elastic search or MySQL? Etc
In our group, We literally have a system that's called Lego design
The real question start when the ask why this, why not that
read the NALSD chapter of the google SRE book and see that the design they end up with for google analytics dashboard is imo more thoughtful than a lego approach. lego is probably good for new grads though
New grad ?