I’m creating a private online store for a client and we want to build a basic rewards tool where a supervisor can reward an employee with a dollar amount, code it to a department and send via email to the employee. The website will not be open to the public, it would need to have a login for every employee to have their own account, plus a login for supervisors to have separate Admin access to assign reward points (or dollar value) to the employee. I’ve researched a little and found 3rd party apps for loyalty / rewards programs… but those seem to be more for public facing online stores. What I need is very basic and not many bells and whistles to it. My question is, does something like this exist or do I need to build one from scratch? am I able to build one from scratch and have it integrate properly?
Is the dollar amount only for spending via this store? 
Yes it is… this is a private store and all the money (or gift cards) are awarded for purchases on the private store. Each employee would log in and have the monetary credit (preferably) or gift cards in their shopping cart to apply upon checkout.
Ah okay, you could do this then without building anything I think.
If each staff member has a customer account, grouped into teams or departments by tag.
The manager could then just log into Shopify Admin and award store credit or I guess gift card to the staff members customer account.
Then they’d be able to spend it automatically on the store 
awesome! you’ve been so helpful. A couple clarifications. So basically it would be utilizing the functionality that Shopify already has built in it? Am I able to customize it? As an admin, does it shoot an email to the customer (employee) that I awarded them credit (gift card) and can it be sent with a personalized message?
The admin to award these credits (gift cards) would be a few people within my clients organization… it would not be me as the “developer” of the site. I want to be totally off hands when it comes to awarding credits and put that responsibility on to my client’s department managers
Yeah I think you could do it all with Shopify functionality.
Had a look into the notifications for you, and gift cards here will work better than store credit.
So give managers access to Shopify Admin and permission to award gift cards, you should be able to give a role for them to have.
Make them write the personal message in the notes section when creating a new gift card.
And issue a gift card to a specific customer (staff member).
As the developer, edit the customer notification for new gift card to display the note in the email.
Then they’ll get the normal gift card notification with a personal message!
Then it should all work for you out the box.
This is all great news and thank you so much for your time and expertise Jordan!
No problem, let me know if it all works for you 