I have been rigorously working on MongoDB, NodeJS, ExpressJS, AngularJS and related frameworks eg Loopback, Sails for 5-6 years now. I have been CTO and founder for a Healthcare startup, Medd (Acquired by 1mg/Healthkart+), where the whole backend I developed on Node itself and where content uploading was highly required. Also, I have worked with IoT based startup, Leaf Tech in Node, Socket and XMPP.
I am good at building RestFul APIs and utilizing them.
I am currently working as Senior Technology Architect at one of the prestigious and fastest growing startup of India. I am also working as freelance consultant for couple of good startups.
So I think I might be helpful in best possible contribution for this requirement. Give me a chance and I am sure you will come for more :)