In 1916, he signed for MTK Budapest in the Hungarian League, where he played primarily as a right wing back.

In 1929, he moved to the United States, where he attempted a comeback with the Brooklyn Hakoah of the American Soccer League.

[8] After making his international debut at 17 years of age, Braun earned 27 caps, scoring 11 goals, with the Hungary national team.

During 1932, he was a member of a four-member commission in the role of coach of the Norwegian national team for four games.

[citation needed] Drafted as a Jew into forced labour in support of the Hungarian Army in the Eastern Front in World War II, Braun was killed in 1943 in a Nazi forced labor camp in Ukraine.