Actually, since the recession, unemployment increased by the same proportion in all sectors of the economy. That is, software engineering unemployment is about twice what it was before; construction unemployment is about twice what it was before; etc. etc. etc. This indicates that the problem is not structural (i.e. not due to people having the wrong skills), but due to a shortfall in demand: everybody tightened their spending at the same time.

Sources can be dug up if desired.