I believe that quality in your application is a result of many factors.
Just a quick brainstorm:
Code conventions help, you can use them in peer reviews. AQM is also a possible tool, but i believe that common sense and a common understanding are always more important than metrics and written conventions.
In my opinion every team needs at least one good senior team member to guide the effort and to make sure not get lost in details and to avoid common mistakes.
Just a few thoughts on this, i hope this helps,
You are right this is much broader topic than just the “low-coding” standards or review ex-post...