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TeamCity's "config as code" feels a bit like an afterthought to me. (It's very Windows-style, where PowerShell got bolted on, and you're still fighting a bit of an upstream current getting clickops users out of old habits. I've also only experienced it at .NET-stack jobs, though, so I might be a bit biased :-)

(I don't recall _loving_ it, though I don't have as many bad memories of it as I do for VSTS/TFS, GitLab, GH Actions, Jenkins Groovyfiles, ...)

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The quotes around "config as code" are necessary unfortunately, because TeamCity only allows minimal config changes. The UI will always show the configuration from the main branch and if you remove or add steps it might not work.

We needed two more or less completely different configurations for old a new versions of the same software (think hotfix for past releases), but TeamCity can't handle this scenario at all. So now we have duplicated the configuration and some hacky version checks that cancel incompatible builds.

Maybe their new Pipeline stuff fixes some of these short comings.

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