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Architecture is driven by the business model. This includes the type of operational data storage chosen. If the business or contexts are modeled well, the tech stack announces itself. Even then you can run POCs to validate the model and its performance requirements.

You don’t choose the stack first. The solution identifies the stack.

Before picking data structures and databases, you have to look at the data.

How is it shaped? What will you do with it?

Answering these two questions will get you through the decisions.