Google

Interns are potentially given very high-impact projects and a lot of decision-making power in how to approach them, for example design, leading meetings, looking over user feedback, and performance optimization.

Google really cares about pushing high-quality engineering code and has very good infrastructure and documentation to help you with that.

Management (at least within my division) was extremely accessible and would always listen to my thoughts. We even had a week within our group dedicated to discussions on diversity. People on other teams/roles are also friendly and open to talking.

A culture that really promotes good character (being "Googley") and personal well-being.

• Above pros may depend on the team.
• Recruiting/hiring process changes a little bit every year, so it's a bit confusing even for returning interns or interns looking to convert.