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  • Tom Glaser thinks this is interesting:

When it comes to how small is small enough, I like to think in these terms: the smaller the service, the more you maximize the benefits and downsides of microservice architecture. As you get smaller, the benefits around interdependence increase. But so too does some of the complexity that emerges from having more and more moving parts, something that we will explore throughout this book. As you get better at handling this complexity, you can strive for smaller and smaller services.

From

Cover of Building Microservices

Note

Regarding size of microservices