What are the Main Design patterns should I know in Amazon AWS?

I don't think design patterns are that important unless you're doing architecture work on a relatively new project.

For a junior, mid-level, and even a senior engineer, I'd focus more on making quick impact on your team in the first few months. That quick impact will not come from knowing design patterns -- it'll come more from diving into the codebase, making improvements, fixing bugs, and improving documentation. And while you do that, making sure you communicate and build trust :)

The other reason why you won't find design patterns be too important is because at a large company like Amazon, most projects will have some unique mix of architecture + tech debt: it may have started out as a vanilla design pattern, but it has morphed into something with tons of quirks and domain knowledge.

So even if you knew the design patterns, it may not be very applicable.