Though sealed from public view, a law enforcement agency may still be able to see. It really is up to the individual law enforcement agency, and, of course the charge.
Although the record is sealed from public view if you are looking for employment with a state or federal agency the agency will be able to access your records. You should check with the specific agency you are interested in working for to see what their policy is. You should also speak to a criminal defense lawyer to find out if there is any way to get the juvenile matter expunged.