Permission to enter Germany and start to work depends on your citizenship, how soon you plan to begin work after arrival, and how your qualifications are recognized. It is important that you consider all three elements together.
Applying for a German visa is a complex process. You have to figure out, which type of residence permit you need. Then you must get all the necessary papers and forms. You have to make an appointment at the German embassy and the foreigners office in Germany, depending on whether you apply from Germany or from abroad.
There are many types of German visa, or „resident permits“ to use the official language.