We use BitBucket here, rather than Github - similar risks, I know, but we have predetermined repositories which are all set as private. 3 dev machines which are kept on premises at all times.
Still not optimal as far as security goes, but it seems that he have roughly the same exposure if AWS leaks our keys and passwords to other third party trackers...
Be careful when modifying user access to a private BitBucket repository. Their autosuggest for the username input field will show all bitbucket users. Makes it incredibly easy to accidentally grant somebody outside of your organization access to a repository.
Still not optimal as far as security goes, but it seems that he have roughly the same exposure if AWS leaks our keys and passwords to other third party trackers...