The spelling "doest a job" is outdated and not commonly used in modern English. It is actually an incorrect form of the present tense verb "does". The correct spelling should be: "does a job". In IPA phonetic transcription, it is pronounced /dʌz ə dʒɒb/. The use of the third person singular verb "does" with the object "a job" means that the subject is performing or carrying out a specific task or work.