From 2010 to 2019, he worked in the bodies of the military prosecutor's office of the Mykolaiv, Kirovohrad, Kryvorizk, Kyiv, and Kharkiv garrisons.

On 29 January 2020, the Cabinet of Ministers supported Hryshchenko's appointment as Chairman of the Sumy Regional State Administration.

[4] He is now an army officer of the military management of the tactical level, as he is part of the hostilities in the ATO area.

On 4 March 2022, he was assigned to the city of Kharkiv and headed the new 127th separate brigade of the Territorial Defense Forces.

[5][6] On 24 May 2022, he was awarded the Order of Bohdan Khmelnytskyi (III degree) for personal courage and selfless actions shown in the defense of the state sovereignty and territorial integrity of Ukraine, and loyalty to the military oath.