I am in the same situation, but this is what I found out.... when you apply online you just upload the front page of the passport and the document about your work. Whoever sees your application won't see any of your past visas ( and I doubt that at this stage they will check you in their database). Once you have the DTV visa and you will cross the border, the immigration officer will see your past visas, but will never know the details of your application, so also the date of your past jobs contracts. So I guess it should be safe!