[1] He began his career in 1966 at the Chervonyi Zhovten brick factory in his native Kryvyi Rih.
From 1967 he worked at the Kryvorizhstal metallurgical plant[2] as a turbocharger driver, electrician and consequently as a head of department.
In August 1991, he was appointed Deputy General Director for Economic Affairs (actually held this position since September 1989).
Since 1995 - Head of the newly formed marketing department of the plant "Kryvorizhstal".
[1] In 2001, when Petro Dyminskyi become a President of FC Karpaty Lviv, Yefremov was invited to head this team as its General Director.