Here are a few different ways that AWS and Retail interact:

1. The obvious that everyone knows: Retail uses AWS's products, providing feedback and ideas for new services and features.

2. Employee transfers: it's quite common for people to move between Retail and AWS and vice versa, and they bring what they learned in one org to their new org, helping to spread information about best practices.

3. Other employee knowledge transfers: I've personally benefited from engineers in AWS sharing their knowledge about general engineering topics on internal interest mailing lists or through tech talks.

4. Best practices: there are some differences, but AWS and Retail operate similarly in many ways: use of 6-pagers for sharing ideas (https://www.linkedin.com/pulse/beauty-amazons-6-pager-brad-p...), weekly review of metrics, hiring tools and practices being just a few examples.