Social icons share (Jetpack plugin)
To enable job and resume sharing social icons, you need to install Jetpack plugin, connect with using your WordPress.org account (register it if you don't have it yet).
Then go to Jetpack > Settings > Engagement and enable Sharing module. I also recommend to disable other module enabled by default, if you don't need them.
And to go Setting > Sharing to configure which social networks you wish to use, set "Button Style" setting to Icon only, enable Jobs and Resumes post types on "Show button on" setting.