Mostly they do nothing

they are just there to get the blame if things go wrong ( which is very unlikely because there are PMs, tech leads etc

)..also softwares can be made to work by any mean...ex: client says, i want X to happen when Y happens, so somehow it can be done. so they just hang around showing off their job title

their asses get fired when client says I want X to happen one million times when Y happens
Saralawa kiwwe hode

have seen that happening lol
But the correct answer is, architect is like the guy who plans the house. Where to put the kitchen, the living room, the toilets etc.