Knowledge of Node.js and frameworks such as Express, Koa, Socket.io and any ORM
Knowledge of building a REST APIs from the ground up
Knowledge of Cloud environment (AWS) should get more priority
Understanding the nature of asynchronous programming and its quirks, and workarounds.
Understanding fundamental design principles behind a scalable application.
Creating database schemas that represent and support business processes
Proficient understanding of code versioning tools, such as Git.