Amazon job posting a sign of development to come?

commentary

Amazon is not your typical enterprise, but that may simply be because it's a little ahead of its time. As such, I found this job posting for a developer position intriguing. A sign of jobs to come?

You must have:

• Excellent communication and analytical skills.
• Advanced UNIX (preferably Linux) systems engineering skills.
• Extensive practical experience with Perl programming and shell scripting.
• A deep understanding of core internet technologies (e.g. TCP/IP, DNS).
• The ability to operate in a fast paced environment.

It's the "preferably Linux" over UNIX that got my attention, as well as the obvious need for Internet savvy, given that it's Amazon. Is this a glimpse into the future, or is Linux already the default preference over generic UNIX experience?