Well, to put your mind at ease, you can apply for any type of visa you qualify for. As a civil engineer you are probably highly qualified (congrats!

) so you can try the HSMP, or get your employer to apply for a WP (might be slightly long process, I don't know). I think your skills are highly sought after.
However, I am not sure whether or not you can do it in-country. I think these cases you need to return home (or is it vice-versa?), but it wouldn't really be a long process, if you have all the documents. Someone else can tell you more, but I'm quite sure you would not have to leave the country for good if you qualify for a work-type visa, student visa or the like.