[tylerdiaz]

It's possible service development is happening very often, just not in the dev circles I spend time in. (web based startups)

Regarding writing interfaces for the service, that's fine too. It's just an easier way to integrate with a service. But there's a big difference between writing a service interface and a library that implements the service's functionality.

We do have plenty of open source services (e.g: Zookeeper, Redis, Kubernetes), but few product level like Stripe/Auth0. Yet there's a lot of duplicated effort in things like writing ecommerce/forum/blog/geolocation/social software. I wonder why we don't have more of these.