Here's some things off the top of my head: * Single business function. Microservices don't have to be small, but all their calls should facilitate s single bus

Here's some things off the top of my head: * Single business function. Microservices don't have to be small, but all their calls should facilitate s single business function. * Automated deployment. Services are deployed and undeployed live based on load. * Unknown targets. Services are allocated and deployed to machines at runtime. The machine itself may even be allocated on demand. So service discovery is absolutely required. * Stateless. Services instances can be spun down at any moment, so they can't be holding transaction state.