He then joined the medical humanitarian organization Médecins Sans Frontières (Doctors without Borders) in 1994 serving as a translator and administrator.

From 1995 to 1998, he was the Head of the Department in the Caucasus representative office of the USA headquartered Philip Morris Company.

[1] From 2004 to 2009, he was a PhD student at the Philosophy, Sociology and Law Institute of Azerbaijan National Academy of Sciences.

In October 2009, he defended his dissertation on "Moral aspects of ethno-political conflicts" and received a PhD degree.

He is the author of more than 100 historical, social and political articles published in periodicals in Azerbaijan, Turkey, Ukraine, Russia, Serbia, France, United States and Pakistan.

In November 2021 the United Kingdom's National Crime Agency (NCA) filed proceedings to seize 15 million pounds in bank accounts belonging to the wife, son, and nephew of Javanshir Feyziyev on the grounds that the money had been laundered through the Azerbaijani laundromat scheme.

[3][4] Since 2017 the NCA has not succeeded in proving any involvement of Javanshir Feyziyev or his family members in any unlawful activity.

In 2013 and 2018 he was elected as a member of the Board of the Press Council of the Republic of Azerbaijan at the Congress of Azerbaijani Journalists.