"Are you doing job applications?"
Translation:İş başvurusu yapıyor musun?
I found this: http://ielanguages.com/turkish-noun-compounds.html Maybe it can help.
Maria, it's cool that you answered your own question! It looks like the ielanguages page makes some confusion between true noun compounds, where both words are nouns (e.g., polis memuru, "police officer") and simple cases of nouns preceded by adjectives (e.g., beyaz at, "white horse"), which do not qualify as noun compounds. Have you also checked out https://elon.io/learn-turkish/lesson/compound-nouns ?
So mI is the question marker, and you use it to ask yes or no questions, or when there are only two alternatives from which to answer. ("I" just indicates four way vowel harmony)
It takes the personal suffix, depending on whom/what you are asking about
1st person singular: mIyIm (e.g. gidiyor muyum = am I going, hasta mıyım = am I sick)
2nd Person singular: mIsIn (e.g. gidiyor musun = are you going, hasta mısın = are you sick)
3rd person singular/plural: mI (e.g. gidiyor mu = is he going, hasta mıyım = is he sick sick. Just put onlar at the start if you want to say the instead of he/her)
1st person plural: mIyIz (e.g. gidiyor muyuz = are we going, hasta mıyız = are we sick)
2nd person plural: mIsInIz (e.g. gidiyor musunuz = are you going, hasta mıyım = are you sick)
This is covered in the "tips" section of questions - 2. Just a note, when you are inquiring using past tense (DI), the personal suffix stays in the verb and you just put mI on the end (e.g. ben düştüm mü, sen benden ayrıldın mı?). If you have any more confusion please ask!
Remember that "Elma yiyorlar" can (and probably does!) mean "They are eating apples." Turkish general (i.e., non-definite) direct objects cannot have the plural suffix. (https://www.duolingo.com/skill/tr/Food/tips-and-notes)