Hadejia attended Sacred Heart Primary School Kaduna and Barewa College Zaria, after which he enrolled in the School of Basic Studies at Ahmadu Bello University for a year, passing the IJMB, which gave him the opportunity for direct admission in a degree course in law at the same institution in 1983. He graduated with a law degree in 1986 and went to the Law School Lagos for his B.L. qualification and subsequent call to Nigerian Bar. He also enrolled in diploma course at Oxford University, where he obtained a diploma in computing.[4]
Two years later, he joined Liberty Merchant Bank Lagos, where he worked in credit administration, banking operations and international treasury for eight years.
He was appointed the Deputy Governor before the elections in 2003 and ran again as a Deputy Governor on the ANPP tickets a few months later and continued in that position till 2007.
From 2007 to 2014, he was engaged in private business in the insurance, construction and security consultancy sector and was also a partner in the law form of Hassan,Iman & co.[4][5]
Politics
In 2014, he was involved in the formation of the All Progressive Congress APC as a state leader of the ANPP, one of the three political parties that formed alliance and was elected Deputy Governor of Jigawa State on joint serving in that role from 2015 to 2018. He ran for and won a senate seat in 2018 and is currently the senator representing the Jigawa North East senatorial zone.[6][7]