I think most people who flock to Micro Services are looking for a better design / architecture choice for software. The thing that Micro Service can teach you i

I think most people who flock to Micro Services are looking for a better design / architecture choice for software. The thing that Micro Service can teach you is Single Responsibility Principle and learning to segregate responsibility. You need to define a clear scope of the 'modules' in your system. At the end of the day if you don't architect your system correctly Monolith / Micro Services won't help you. For me and my team now I have 1 ideaology regarding this topic. I don't care whether it's monolith or micro service. As long as I can have clear segregation of responsibility between the different modules. Our company now has a monolith (core banking app) that has modules that handle their own responsibility and communicate whether its over http or internal communication bus we developed it doesn't matter. We can easily move modules out into a separate service if we need. What determines the factor of whether we move things into it's own service? A few things. If we need to deploy / scale something independently we will decide to take on the overhead and move things out into their own external service. Or if something has a specific security requirement that will increase the complexity of the overall system we will isolate that and deploy it separately. Otherwise we keep things as a monolith. For example in Banking there are many things like the ledger / transaction data that are highly sensitve that require certain security requirements like being hosted on a cloud that has certain standards. We will deploy this part on GCP. But People seem to love to stereotype and find a one solution fits all. There is no such thing. Everything in engineering requires a deep level of understanding of the problem and making choices and the problems present itself. I believe most apps can start their life out as a monolith, and can grow and divide as needed. There just isn't a one size fits all for anything in tech. That's what I've learned.