On 1 April 1963, Miah found employment with the Pakistan Atomic Energy Commission (PAEC), initially attached to the Atomic Energy Research Center (AERC) in Karachi. In 1969, Miah got an associateship at the International Centre for Theoretical Physics in Italy. In the same year, he returned home to Pakistan and continued with the AERC. In Karachi, Miah was the chief scientist at the Karachi Nuclear Power Plant but had his security clearance revoked, that led to termination of his contract and his migration to Bangladesh.