You can add up to three custom build steps that run at pre-defined stages during build time.
To configure build scripts, place the scripts with the respective format next to the project-level (.xcodeproj, build.gradle, .csproj, .sln or package.json) file that you've selected in the build configuration and we will run them as custom build steps. For iOS and Android apps, we support Bash scripts, for UWP apps we support PowerShell scripts.
Once you do this, the pre and post build jobs are located on the App Center portal, and here are the steps to find it:
Navigate to https://appcenter.ms
Navigate to your app
On the left hand panel, click on
BuildHover your mouse over your branch you’d like to configure, on the extreme right hand corner of the row, click on the
geariconUnder the header
Build app, click onMore optionsUnder
Build scripts, you will see the scripts
Here is the documentation for more details, and an example of how QuickType does it – pre and post build.