There's no reason for a job posting to be jargon-free, but the jargon used should be understandable by anyone who might be qualified for the role. I find it hard to believe that detailed knowledge of MSFT culture would be required to work in a group whose goal is to help the company compete with open source stuff. If anything, this knowledge is a detriment. Had the poster used acronyms like FOSS, I would have no issue.
