Majeed returned to Pakistan in 1974 after India had conducted a surprise nuclear test, codenamed "Pokhran-I". At the Pakistan Institute of Nuclear Science and Technology he was assigned to the Nuclear Chemistry Division led by Iqbal Hussain Qureshi. In 1974, Majeed was a part of Munir Ahmad Khan's team that had supervised the criticality of the second nuclear pile —PARR-II reactor. After the construction of the third nuclear pile—PARR-III, also known as The New-Labs; Majeed was the first technical director, and was part of a team that supervised the reactor's criticality. An expert in plutonium technology, Majeed, as junior scientist, is known for his contribution in the plutonium reprocessing plant and plutonium nuclear fuel cycle technology. Majeed was also a part of a team at the New Labs that had succeeded in attaining fresh supplies of weapons-grade plutonium isotopes, produced by the reactor. In 1990, Majeed was promoted and was made Director-general of Nuclear Chemistry Division by Munir Ahmad Khan. Throughout the 1990s, Majeed was responsible for underground work of the nuclear reactorKhushab-I, and the CHASNUPP-I commercial nuclear power plant. There, he was the director of Radiation and Nuclear Safety Division and was omitted from the weapons development teams. He published extensively in the 1980s and 1990s on nuclear detectors and the use of x-ray diffraction, fluorescence, and crystallography to study a wide variety of materials and elements, including stainless steel, uranium, plutonium, and thorium. Due to his work for the State, he was conferred with the Tamgha-e-Imtiaz awarded by the Prime Minister of Pakistan, Nawaz Sharif, in 1998.
Events of 2001
American CIA intelligence officials said that the first interrogation of the two Pakistani scientists concluded that Mahmood and Majeed did not know enough to help build a nuclear weapon. "These two guys were nuclear scientists who didn't know how to build one themselves," the American official said. "If you had to have guys go bad, these are the guys you'd want. They didn't know much."
Aftermath and legacy
The NGO scandal heavily disturbed his image and also his private life. Even though he cooperated with intelligence agencies in hope of being released, and went back to PAEC; he was declined any partial freedom. He was harshly interrogated for a long time, which also resulted in his death. Bashir Syed, former President of the Association of Pakistani Scientists and Engineers of North America, said: "I know both of these persons and can tell you there is not an iota of truth that both these respected scientists and friends will do anything to harm the interest of their own country."