I'm a lone dev too. I've been using microservices with Google App Engine. By using some templates and some conventions I find it easy to create modular back-e

I'm a lone dev too. I've been using microservices with Google App Engine. By using some templates and some conventions I find it easy to create modular back-ends. Basically I design using fairly detailed use cases and data model. Then each scenario in the use cases is implemented as a microservice. This approach makes single responsibility design rather easy. As business requirements evolve, the updated use cases lead to changes and additions. All rather neat and easy.