Cover letter correction

Hello everybody,
Can someone help me correct my cover letter please ?
Thank you very much

XYZ Internship (Job ID 99999)

Dear Sir/Madam

I am currently student in last year at University of Technology of XXX (XXX, northeast of France) and I am looking for a 24-week internship which will start in summer 2014 (the begin date is flexible; the internship can begin from July 15 to September 15)

Backed by the skills I got during my formation and completed by my work experience, in development as well as in network & system administration, my expertise in computing is rather wide in various fields of computing from development at several levels (web development, system programming, C, C++, Java) to administration of databases, systems and networks. The training I'm currently following provide us with broad concept useful for an engineer and give us the base to learn quickly and independently. Combined with my experience, it has given to me an ability to adapt fast and easily. The enclosed resume will give you a more accurate overview of my professional path and my skills.

I am looking first of all for a challenging internship where I will be able to learn deeply one or several technologies. Cyber Security has always been a field in which I want to improve my knowledge. Working with a team will allow me to progress and to be updated in a field that is in constant evolution and become more and more essential. Thank you for believing in my commitment and my motivation in all the tasks you could assign to me.

Thank you for your consideration. I look forward to hearing from you.

Sincerely yours,