Self-hosted runners are now available on CircleCI! You can choose which jobs run in the cloud and which run on your own infrastructure.
Read the blog for more info: https://circleci.com/blog/our-cloud-platform-your-compute-introducing-the-circleci-runner/
Landing page: https://circleci.com/build-environments/runner/
Docs: https://circleci.com/docs/2.0/runner-overview/
Ask your questions and leave your feedback here!