I‘m a principal engineer on Sublime Text, having been working on the product since 2016. I also handle design work for Sublime HQ. I began my involvement in the Sublime community in 2011, and wrote Package Control.
My open source projects are primarily an artifact of various personal projects. Currently the only one under active development is Package Control, but the crypto packages are maintained.
I generally will add contributors to repos once they have shown a pattern of useful contributions, be it responding to issues or sending PRs.