Are you serious? The "right" infrastructure? Are you limiting your view to a single service, running on a big cluster? Because even then there are permanent conflicts in the persistence layer and resource conflicts express themselves in huge infrastructure bills.

But things get really messy when your software is distributed in heterogeneous environments. Say you ship a database yourselves. Or a multi-platform app, or a game, or the control software for medical devices, or...

Software development is not just running the next SaaS product.