The sentence is written correctly because as a whole it expresses a complete idea, it begins with a capital letter and ends with a period and the adverb clause “When applying for a job” is punctuated correctly. Adverb clauses can be placed at the beginning, the middle or end of a sentence. When they are located at the beginning, like in the sentence, they take a comma; when they are in the middle, they must be surrounded by some type of punctuation, and when they are in the end, they take no comma.
