If you have an employment contract, a work permit in Turkey will replace the residence permit.
The procedure for obtaining a work permit in Turkey is slightly different in that the application must come from your Turkish employer. Nevertheless, you will also have to come to an appointment with a file consisting of the same documents as for an application for a residence permit plus your employment contract, a certified translation of your diplomas, and, either a work visa, i.e. a residence permit with a validity period of more than 6 months.
A work visa will have been issued to you by a Turkish embassy or consulate in your home country if you found your job from abroad. If you find a job after entering Turkey on a tourist or study visa, you will need to obtain a residence permit before you can convert it to a work permit.
The termination of your employment contract leads to the termination of your work permit and thus puts an end to your authorization to stay in the country. However, it is possible to immediately apply for another permit, either to reside or to work if you find another job.
Renewal of residence permits in Turkey
The renewal application must be submitted no later than 1 month before the expiry date of your permit.
The documents required for renewal are the same as for an initial application. If your personal situation has not changed since your previous application, you will not have to attend a physical appointment and can simply send the required documents by post.
Permit renewals can be issued for a period of 2 years. 8 consecutive years of residence or work in Turkey will make you eligible for a permanent residence permit.
Good to know :
The Turkish immigration services have created a toll-free number (157 from a Turkish line) where operators speaking half a dozen foreign languages are on hand to answer all your questions about residence and work permits.