Not sure what your code does, but if it's (just) a http server you could deploy it as a lambda. There are adapter packages you can simply drop in. More on reddit.com

You won't learn enough AWS in a week to pass an interview because you likely don't know which products/services they're using. I have interviewed hundreds of programmers to write apps on AWS and the tools and techniques they use are pretty broad and varied. Cost optimization in a nutshell -- you only pay for what you use. Use the AWS billing reports to figure out where the costs are. Be intentional with multi-region or multi-AZ or whatever else, don't just make things highly available for no reason. Consider hosted databases carefully for they are quite expensive. Turn things off when you're not using them. Use "elastic" services whenever possible to contain costs. Developers on AWS can use any number of products/services, you can have two expert-level developers with AWS experience and they may not know many of the same services lol! On the upside, learning AWS isn't that hard and there are plenty of resources out there. Feel free to DM if you have any questions, I've interviewed hundreds of programmers with AWS experience, I was the guy who confirmed you knew AWS lol :D More on reddit.com

This isn't really AWS specific. Easiest would properly be AWS beanstalk. Try googling it if you want it on AWS. Or maybe serverless lambda? More on reddit.com

serverless is the killer when it comes to low traffic websites. however, it requires a complete redesign. nodejs can be run in a lambda, with the route cloudfront -> lambda url -> lambda. if you use a web framework, you need to figure out how to translate lambda events to web requests. or simply drop the framework, and parse the request yourself. however, there is no serverless rdbms on aws. aurora serverless is not it, don't even try. you need to move to s3 or dynamodb as storage. More on reddit.com