Hello,
I'm not sure about the category you should apply for. But I think that you should put as much details as possible in your letters.
For example:
· Exposure to Software development in C, C++, Java etc.
· Very good knowledge of C, C++ with Data structure, core Java and oracle 9i.
To me it seems kind of vague. From what I understood from the ACS website you have to be extremely detailed in your job description. What do you mean by "exposure" and "very good knowledge". I think maybe you have to explain a bit more what you did.
Good luck!