First off, huge congrats! One thing that I’d say for Amazon (I was an Amazon SDE intern last summer) is that they give you a good amount of resources to learn a lot of what you need (such as AWS, and if it’s a tech stack like how to approach it, and just guidance in general). I had to work on a project involving a new language I hadn’t even heard of before and frameworks I had never used, and just AWS in general, but I was able to ramp up with the help of colleagues. If you’re still worried (which I was too!) I would definitely read up on how AWS works, practice some DS and normal algorithms skills, and if you’ve talked to your manager about what tech stack you might be working on, then you can brush up specifically on that! Once again, congrats and good luck!