[2] His father was Teuku Cik Haji Mohamad Thajeb, and his mother was Siti Djuaenah.

[2] After returning to Indonesia in 1945, Thajeb worked at the Djawatan Kereta Api workshop in Manggarai, Jakarta.

[1] In 1948, Thajeb was appointed Head of the Civil Aviation Division at the Ministry of Transportation and held that position until 1950.

In March 1956, Iskandar Tedjasukmana appointed Thajeb as a member of the Central Labor Placement Advisory Council.

[6] While working at the Ministry of Transportation, Thajeb also served as an Indonesian delegate at international conferences.

[1][5] Thajeb began his organizational career by joining the Medan branch of Pemuda Indonesia (Indonesian Youth), serving as deputy chairman from 1928 to 1930.

[12] While serving as a member of Parliament, he proposed extending the duration of higher education to five years and drafted a bill requiring companies with more than 1,000 employees to build housing for their workers.