This depends on the team. Some common teams that interns work on at Amazon are Alexa, Amazon Appstore, Finance Tech, Internal software tools, etc. I worked to improve on Amazon's book review blogging platform with Java.
Former Software Developer Engineer Intern at Amazon
about 2 years ago
A SDE Intern at Amazon typically works with an engineering team. An intern is given a project which is scoped in such a way that the project can be completed in 3 months(the duration of the internship). The project that the SDE Intern works on is related to the work that the engineering team does. Most interns can expect to see their project in production(which means their work is used by millions of Amazon Customers).