Need a freelancer to develop Knack database

We're looking for a Knack developer to help us create a custom app. The database will be based off of a Google Sheet with approximately 450 rows ("records") and 20 columns. This may need to be separated into 6-7 "many-to-many" relational tables. We also need to create various graphs/charts based on filtered segments of this data. There will be two user profiles: admin (full access) and subscriber (view-only).

We will also need a frontend built to accept payment from new users that want to sign up to access the database and pay on a monthly basis. We would like everything to be integrated into our WordPress-powered website.