Get total number of applications made by a candidate

You might be able to do this with some custom code, but that’s not something we can really help you with. You may want to look into one of these services:

https://jobs.wordpress.net/

https://studio.envato.com/

https://codeable.io/

As for overriding the candidate profile page, I’m not sure what you mean by that. Which page specifically?

In any case, here’s our tutorial on overriding add-on template files, which will be helpful when you get to that step:

https://wpjobmanager.com/document/overriding-add-template-files/

Thanks!