I can't find softwareengineering.stackexchange data in latest Stack Exchange Data Dump (March 14). I don't know how to report this 'bug', but found a related post about missing Stack Overflow in Russian and the 'bug' was fixed in the next release, so I think another post here will help.
It is there, only under the old name of the site - programmers.
programmers.stackexchange.com.7z is what you are looking for - we did not change the database name, which is why the data dump contains that.
We may be able and change it in the future, but it isn't trivial to do while keeping the site online...