Hello
I am MERN stack developer and have rich experience in back-end(node.js) and mongoDB, Authentification/Authorization. I have ever implemented it using token and permission table. If you want, I can show you source code of my past projects.
I work full time and individual. I promise high performance and clean code. I don't expect higher fee for this job.
I hope to work with you.
Please send me your chat for more discussion.