Designing scalable systems [IMPORTANT]

Hello, in this post I ask if there is any way to make a scalable system in unreal engine. Can you confirm if it is possible?

https://forums.unrealengine.com/community/general-discussion/1568092-designing-scalable-systems-important

References:
https://stackoverflow.com/questions/54015999/what-database-is-focused-on-games?noredirect=1#comment94875797_54015999

Regards.

Any advanced programmer who knows the subject?