I agree with Doug the Head:
PTI is nothing more than a low-cost operation, cleverly disguised by a premium product...
I also have some good friends working there and they all looking around for a new job. all i hear that it is not the same privatair as it used to be since Latzis the Greek pulled out himself, the company is in continuous nose dive and trying to survive.
Every career step is connected with worst salary, working and tax conditions. The salary steps, benefits and the pilot grading system is far behind being transparent and fair. They lost all Swiss and Dutch leasing contracts. They still fly for Lufthansa on second class and undesired routes but the big question is for how long?
Some pilots flying in Brazavile for Ec Air reporting health wise risky environment (very high Malaria, Cholera and Hepatitis risk) and substandard accommodations.
IMO it's wiser to start and invest energy in another company.
Try sunexpress or some other B737 operators which are more stable, promising, transparent and fair towards the employees.
if you still like to try your luck with Privatair make sure to ask the salary steps and don't believe any verbal given promises. Find out the German tax amount in case they would force you to fly the German tailed aircraft which qualifies you to German tax.