Here is a new "correction" since I misunderstood some of your post.

Computer skills

The realization (I assume you have not yet completed the Final Theses.  In this case, you might say 'implementation' or 'the process of completing my Final Thesis') of my Final Thesis gives me the opportunity to learn by on my own how to work with CAD software, without any previous knowledge, and how to manage to combine this project with my work as an intern (o, with the work during my intership) (coipaginar la realización del proyecto con el trabajo como becario).  For example, you could say:

The process of completing my Final Thesis gives me the opportunity to learn on my own how to work with CAD software, without any previous knowldege of it, and to combine this project (my interest in learning CAD) with the work in my internship.

In this job I bring solutions to the team to optimize the quality control times as well as technical files management.

Nowadays the market it is always changing and one of the most common software programs in the design industry it is Catia. I have been studying this program for some time ago and I am capable to working with it.

I hope I understood correctly this time.

Computer skills

The realization completion of my Final Thesis gives me the opportunity to learn by on my own (por mi cuenta) how to work with CAD software, without any previous knowledge, and how to manage the project with the work as internship (? I'm not sure what you mean here, maybe "to manage the project I have to do during my internship" ??).  In this job I bring solutions to the team to optimize the quality control times as well as technical files management.

Nowadays the market it is always changing and one of the most common software programs in the design industry it is Catia. I have been studying this program for some time ago and I am capable to of working with it.

Nicely done.  I'm not sure I understood one sentence (see above).