The jobs were those masters of handwriting called "katip"s. Neverthless, he industrialization of Ottomans was demolished by so many other reasons as well. The discovery of New World which led to loss of importance of trade routes that go through Ottoman reign, the militaristic defeats, the decay in the management levels all added up to Ottomans' fall back in industrial terms. And you know that you can not maintain your political power if you lose your economic strength.

Thus it is not rational to accuse Ottomans for Serbians getting overlapped in Industrial Revolution. Because Ottomans themselves were set back.