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You might have trademark issues with Gitlab's Gitaly https://gitlab.com/gitlab-org/gitaly

Saw your hiring post - may I ask, what funding did you get?

Have you considered integrating with git’s pull request model (eg: sending an email) rather than just cloning GitHub web-based fork-based model?

Good luck on your projects! You should probably add Gitea to your comparaisons, at it seems to be the closest to your project (written in Go, lightweight).