Encrypting more sensitive information like account password, credit card numbers (if you are going to store it somewhere) is primary. Encrypting the data stored at rest in hdd's are necessary too.

Other than this encrypting processed data or meta data information can considered to be secondary..

Yeah, I too do most of the times.. Stumbling the problem or the code flow in mind may be a difficult one but it becomes a lot easier when we narrate it orally!

Are these openings are for full time job or for intership?

I wish to develop an app like posting problems and it should contain the following part ( i] discussing about the problem ii] why this problem has occured - the root cause of the problem iii] and the finally solution for the problem and iv] suggestions for improving the solution ) like this..