Hi,
I worked as NPI also last time but with other manufacturing company, hmm very challenging job, many paperwork, and have to work on the product startup...
what I can says, u will work in team involve many depts to make sure the product move to the production line without any problem, hmm u know product mainly come from usa or where is the company come from.. so it involve hardwork and many left this job since its really take ur time..
anyway if u stay with this job 10 years i guarantee manager position will be yours