How do technical product managers work at Amazon? What's the difference between a PMT and a TPM?

First of all, we need to address Amazon's terminology for these roles. A technical product manager at Amazon is generally referred to as a Product-Manager-Technical (PM-T). Whereas a Technical Program Manager (TPM) is a distinct role that sits at the intersection of product, engineering and program management. An Amazon TPM is a unique role that combines business ownership over delivery with high-level technical architecture. They are usually the program glue - that brings together PMTs, engineering teams and business stakeholders on all aspects of an initiative. However, note that this AMA is focused on the technical product-manager role or PM-T. So please make that translation whenever you see "TPM" in these questions.