One way you can let a Fast Track applicant know that you are interested in pursuing them is by immediately sending them an assessment. With CareerPlug, you can enable an option to automatically send assessments to new Fast Track applicants.
To do so, navigate to Account > Company Profile.
Scroll to the bottom of the page and check the box next to 'Enable Automatic Fast Track Assessments'
Click the Save button.
Any applicant who applies from now on and is considered Fast Track will automatically be emailed with a link to take any assessments selected on the job to which they applied.
As an added check, you can ensure that the correct assessments are enabled on your active jobs by editing each job (or editing the job template and applying these changes to all jobs). You can also review your default assessment invitation email. More info: How do I customize the email templates that are sent to applicants?