I recommend the combination of two. Just consider what type of data you should store at what DB. MySql: well-structured (product, order, category...etc), aggregated data. Mongo: mass amount with flexible schema (social part of your product), product review, 3rd integrate log...etc.

Definitely, it's very worthy for t a try. As our platform now heavily bases on AWS, we will give a try with AWS Lambda as well. Appreciate your response!

It was the channel led me to the community ;). Apparently awesome! In term of microservices architecture, there should be more things to consider, IMHO. We are heading to develop an eco-system with multiple products, each of them has it owns characteristic that might requires more than just MERN has. Anyway - pretty newbie with MERN, I'll explore deeper for this possibility. Thanks for your recommend.