It's perfectly possible for a team of 10 devs to run on self-hosted source-code control, run an in-house CI system, and run application hosting, with just one tech (and one backup) working part-time on maintaining the system. You need a VM host for the CI; now you have a VM host, you can build git servers and so on (bring the email inhouse, perhaps?).

As far as maintaining the system is concerned: setups that are hosted by 3rd-parties also need maintenance. Someone has to understand how it all fits together, and how to fix it when it goes wrong. So you still need a team-member working part-time on SCC, CI and deployment.