It is perfectly possible to use Umbraco as a CMS for your application.
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Create API end points to give you the data you want your web application to consume. – have a look at:
http://www.jondjones.com/learn-umbraco-cms/umbraco-developers-guide/umbraco-web-api/how-to-create-a-web-api-in-umbraco-in-less-than-5-minutes -
Then change your Angular application to point to these end points to drive your website.
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Change something in Umbraco, then see the changes reflected in your web application.
solved can we move project from Angular to Umbraco