In 1919, he resigned from the University to join his brother in the hardware business. The Noojin brothers operated a hardware store until 1923, when they founded the Noojin Supply Company. Three years later, Noojin bought his brother's interest and managed the company on his own. Noojin became active in a number of civic activities. He was on the Board of Directors of the American National Bank of Gadsden, Alabama Power Company and the Gadsden Chamber of Commerce. Noojin was the president of the National Alumni Association and member of the Board of Trustees of The University of Alabama.
Inducted into the Alabama Business Hall of Fame (1979)
From 1912 through 1914, Noojin was head football coach at Howard College (now Samford University). During his tenure as head coach, Noojin compiled an overall record of 10 wins, 13 two losses and 2 ties (10–13–2). He later served as an assistant coach at Alabama, and was to serve as head coach for the 1918 season prior to its cancellation due to the effects of World War I.