For a free, self-hosted CI I strongly recommend TeamCity -- if you can get away with 3 build agents and 100 configurations that come with the free version. I w

For a free, self-hosted CI I strongly recommend TeamCity -- if you can get away with 3 build agents and 100 configurations that come with the free version. I was in your boots some time ago, managing CI before I convinced the company that paying for a hosted CI is cheaper than me maintaining our self-hosted whatever CI we were trying at that point :) Jenkins was atrocious and I spent ungodly amount of time dealing with all kinds of issues, while TeamCity was mostly configure-and-forget. Initial setup is pretty straightforward, so is later migration to a real database for example. Updates are seamless and we had some projects on it even after we started using paid CI (Bitrise), because there was no motivation to migrate as everything was running smoothly.