Systems engineers work closely with systems analysts to maintain a company's IT system by developing the operating systems that run computers. Expect to be quizzed on a variety of technical questions that will test your knowledge of how computer systems work. Employers prefer candidates with a bachelor's degree in an engineering field and previous experience with technology.
can you host multiple https sites with different domain names but same IP on the same server? how
NO, server cant tell which site is which because traffic is encrypted.
The way question posed, the answer is YES, since you could cover all those https sites with a single certificate. But now this should even work for individual certificates http://en.wikipedia.org/wiki/Server_Name_Indication
Yes you can that's what virtual hosting is for. https://en.wikipedia.org/wiki/Virtual_hosting