Thanks Tim. That makes life a bit easier.
FYI: I am now bringing it like this: I have made program for their German market. Since it involved communication with the customer, and since in this small company nobody else was fluent in German, I was very qualified to do this task. However new projects are very technically low level involving embedded software and hardware design, and this is not my expertise.
To me it sounds very plausible. Well actually it is the truth even.