Hajjaj's grandfather Shamsher Ali was a government official in Faridpur during British rule, and his forefathers were Islamic preachers by vocation.

[7] During his undergraduate years, he wrote for the university's student newspaper, he also worked in multiple state senate and gubernatorial election campaigns.

[11] On 21 March 2015, Hajjaj declared his mayoral candidacy for the April North Dhaka City Corporation polls as an independent candidate.

[18] The Nationalist Democratic Movement – NDM was established on 24 April 2017 with the sole purpose of returning the power of government to the hands of the citizenry.

It is a broad based party that practices inclusive politics and champions democracy and citizen's rights, and our inherent national values.

[21] He has urged his political opponents from both Awami League and BNP to rise above their ideological differences and work collectively to build a better Bangladesh.