Millennials judge the performance of a business on what it does and how it treats people.
From the 2016 Deloitte Millennial Survey
Some of the most appealing benefits for younger employees, as we have also noticed, are the mentoring programs, especially those that help them with school work. Millennials who stay longer at a company are likely to have had at least one mentor in the company.
Hubgets addresses the need for remote collaboration and communication by allowing people to (video and voice) call and chat in the browser.
All your team would need is a good internet connection and either Mozilla Firefox or Google Chrome installed on the computers. The content of the mentorship program can include file transfer of any size, you will be able to share your screen while conference calling in a Topic.
This means that your engineers can mentor more than one person, should this be the case.
Hope this helps!