Hi @Alan065
I assume you have not already had a residence permit for another reason (e.g. work or studies) up until now? If so, the authorities can issue you with a paper called a Fiktionsbescheinigung, with which you can work.
If you have not already had a permit, you can be issued with another type of Fiktionsbescheinigung but will not be allowed to work until a decision is made on your application.
Yes, you can either show your letter of application or the temporary Fiktionsbescheinigung at any job interview you have so they know the process has been started.
Best,
Éanna