Probier's hiermit, Andi. Ich habe's ein wenig umgestellt, damit es "englisher" klingt:

Before embarking upon my studies, I trained as an applications developer and subsequently worked in permanent employment. I was thus able to accumulate five years of work experience. My duties included the development and enhancement of application software, in addition to having the technical responsibility for an accounting system. The insurance company for which I worked was very satisfied with my job performance.

My reasons for choosing the *** University are many. I dedicated a lot of time to perusing the information on your webpage, and the courses I read about are my main reason for applying. In particular, I am interested in the courses “Senior Project: Information Systems Development” and “Integrated Enterprise Information Systems” because I would like to extend my knowledge of programming and gain an understanding of the architecture of ERP systems. I am also quite interested in “Principles of Marketing” and “Business Telecommunications for Information System Design”. The small teaching groups and the international profile of the University are further aspects that I appreciate. Furthermore, a fellow student of mine, who previously attended the university, confirmed my positive impressions.

Sollte irgendwas unklar sein, so melde dich nochmal.