In 1918 Whitlam transferred to the Sydney office of the Crown Solicitor's office, and in 1920 he was admitted as a barrister and solicitor of the High Court of Australia. He became deputy Crown Solicitor in 1921, assistant Crown Solicitor (based in Canberra) in 1927, and Crown Solicitor in December 1936.
Whitlam's career path involved transferring to the Sydney office of the Crown Solicitor's office in 1918, followed by his admission as a barrister and solicitor of the High Court of Australia in 1920. He progressed through roles such as deputy Crown Solicitor (1921), assistant Crown Solicitor (based in Canberra) (1927), and finally becoming Crown Solicitor in December 1936.