Amazon has had a long-time culture of having smaller teams that are self-contained, fully responsible for an end-to-end execution from planning to operations. These teams are nimble, have different roles (product management, developer, QA engineer, infra/tooling engineers, and so on) to manage all aspects of the software delivery cycle, but the team is big enough to be fed by two pizzas!
The whole concept around the two-pizza team is to keep them independent, fast moving, and better collaborating to avoid any overheads in terms of communication and processes. This is also an ideal setup from a DevOps perspective, where the team is responsible for a complete release life cycle, which also includes deploying to production environments and infrastructure management.
The other benefit that this setup provides is that each team is responsible for a specific piece of business functionality that often integrates with other components in the system using simple APIs...