Under Georgia law, person is a "resident" and must get a Georgia license if he
has a permanent home or abode in Georgia to which, whenever such
person is absent, he or she has the intention of returning.
However it also says that
For the purposes of this chapter, there is a rebuttable presumption
that the following person is a resident.
(A) Any person who accepts employment or engages in any trade,
profession, or occupation in Georgia or enters his or her children to
be educated in the private or public schools of Georgia within ten
days after the commencement of such employment or education; or
(B) Any person who, except for infrequent, brief absences, has been
present in the state for 30 or more days provided, however, that no person shall be
considered a resident for purposes of this chapter unless such person
is either a United States citizen or an alien with legal authorization
from the U.S. Immigration and Naturalization Service
By being in the state for more than 30 days and accepting employment in Georgia, the law can now presume that you are a resident. You can rebut that presumption with counter-evidence, that is, doing various things that establish residence in NJ including maintaining / renewing your driver's licence in NJ, paying NJ state income tax, using your permanent NJ address for your federal income taxes,
voting in NJ (and definitely not voting in GA).