After finishing elementary school, Stadinger started working as an aircraft mechanic student in the plant of the Sport Flying Association of the University of Technology in Pesterzsébet and Ferihegy.

After the end of World War II, Stadinger joined the re-formed Social Democratic Party (SZDP) in April 1945.

He actively supported the merger of SZDP and the Soviet-backed Hungarian Working People's Party (MDP) in 1948.

From 1 February 1962 to 31 October 1978, he was the CEO of Metropolitan Gas Works (Fővárosi Gázművek) in Budapest.

Amid the transition to democracy, he represented a hard-line Communist standpoint, who strongly opposed reform efforts.

He justified his decision on the grounds that Parliament's work had accelerated and that a younger Member was needed to organize it.