Could you please correct it? My professional experience

I worked for was working during 8 years in a large one big bank. 
At first I worked as a specialist in the Loan Department of a branch. I was responsible for granting credits and openning accounts. Later, as a leading specialist, I replied to (dealt with) customers complaints, trained new credit staff and prepared documents to file an action pursuing debt collection. I was also responsible for a team of 14 employees receiving loan applications and inputting these into the bank's system. 

After that I moved to the Bank's headquarters department as a chief specialist. There I dealt with our branches all over the country, supervising and consulting. I also analysed made an analysis of some loan applications, which should need to be approved by Head office. I took part in creating new credit programmes by market monitoring the market, suggesting credit conditions, concordance and revision of new normative documents. And then I promoted these new programmes by compilation compiling of promotional material such as flyers, booklets, leaflets, website, sms. I also prepared periodical reports for the line management. 

As a student I worked as a promoter. I promoted products did products promotion in a shops, restaurants or bars, such as for example giving free samples to customers, prizes for purchases or possibility to taste a product product tasting.