Soon after the independence of India, he was posted in December 1947 as Superintendent of Police to Raigarh district in the eastern part of the State of MP.
In August 1952, Rustamji was selected to be the Chief Security Officer to India'a first Prime Minister Jawaharlal Nehru.
As Inspector General of Police of Madhya Pradesh, Rustamji dealt successfully with the problem created by the armed dacoits of the Chambal region.
After retirement from the BSF, he was made Special Secretary in the Ministry of Home Affairs and while in that position, he headed a committee which submitted the report for the formation of the Indian Coast Guard, an organization to patrol the maritime border.
His two articles in the national daily, The Indian Express formed the basis for the first Public Interest Litigation (Hussainara Khatoon vs State of Bihar) As a consequence of the judgement in this case, 40,000 undertrials were released all over India.
In his retired life he spent his time writing articles on subjects of topical interest, many of which were published in the newspapers and magazines.