Software Architecture is an interesting rabbit hole that can easily eat many years of your life, but I think you're asking the wrong questions. If you're a boo

Software Architecture is an interesting rabbit hole that can easily eat many years of your life, but I think you're asking the wrong questions. If you're a bootstrapped unfunded startup most-likely it's built using simple and straight-forward software architecture, so learning advanced patterns will not help before you raised more funds and hired more developers. Also, it seems that your real problem was passing a technical due diligence with investors, not learning advanced software architecture. I would suggest pairing with a consultant for one or more sessions and create a very short HLD (High-level Design) document describing your current architecture and design. If you still want to learn SW architecture you can start from Martin Fowler's site: https://martinfowler.com/architecture/ https://martinfowler.com/architecture/