Other than that, you can verify if somebody is an employee via the API: How can I verify an account as belonging to a Stack Exchange employee? but there's no way to get a filtered list. You'd have to scroll through the entire user list (100 at a time, the maximum page size of the API) and have your code filter out the employees. This is possible, see the snippet at the bottom, but you need a lot of patience.
I wrote a script to generate a list of employees here on Meta Stack Exchange and used it here to generate a list of employee profiles. It makes almost 5000 calls to the Stack Exchange API, which requires a key (taken from the documentation pages) and additional special care.