Hi there! We manage the software engineering and data science curricula at The Flatiron School (README and TDD-oriented "labs") using a slightly more rigid version of this process (thousands of repos). In terms of backup and PRs to drive discussion, I simply can't imagine a better "porcelain" tool than Git.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.