I too having been asking around. Did not have much luck. Most of the requirements are in chip design. Software contribution is done by the open source community. Corporations are contributing to open source but the team size is very small.
Most open-source software is written by people being paid to do it, and at SiFive we are expanding the software team as well as the hardware side. Ex-ARM people are certainly welcome and may recognize a few people when they get to the office(s) :-)
