A lot of people are focused on microservices as a way to address scaling (of load, team size, etc.) but there's other reasons to choose a microservice. A pretty

A lot of people are focused on microservices as a way to address scaling (of load, team size, etc.) but there's other reasons to choose a microservice. A pretty basic one is when an existing microservice already does what you need and no suitable module or library exists. In that case, there's no "until". Start with a microservice. There's a number of open source projects that are pluggable microservices, for example.