Answer: As in any other civilized country, you apply for it. Bigger companies have HR departments, smaller have at least one HR professional, to whom you refer your application. Documents usually required in such application are a CV (the official EU format is preferred, although not always required), and sometimes a motivational letter (slightly different than a cover letter).
Jobs in Bulgaria are mainly advertised on the Internet on websites such as jobs.bg or jobtiger.bg, and in newspapers, including a few daily papers that feature ads only.
Answer: At the place near Danube, where it is situated now, it has been founded in 681 A.C. by Khan Asparuh from the Dulo Kin. Before that the Bulgarians had country, called Great Bulgaria, where is now Krim Peninsula, on the north side of Black sea.