In case, you’re not aware, you can also email the dev. You can code up your commits as normal and then use e.g. git format-patch -3 to put the last 3 commits patch files. You can then attach those files to an e-mail and the dev can apply those patches with git am.

It takes a bit of playing around, but it’s actually really easy.
The Linux kernel, one of the most complex projects on the planet, develops like this.