Hello Buddy,
I'm an expert with Node.js, Express, MongoDB, Mongoose, PostgreSQL, FireBase and so on.
I have +2 years of working with Node.js during this period I have almost built +6 apps from scratch( and helped developing a great amount of projects that I have joined them on fire like your situation here)
So hopefully I will be a great asset to you buddy.
Best Regards
Kyrolos