From 1991 to 1999 Vasyl Hrytsak served in operational and managerial positions in the department of protection of national statehood of the SBU in the Rivne region.

[11] From December 28, 2006[12] по 11 квітня 2008[13] to April 11, 2008 [14] he is the Head of Kyiv City Department of the Security Service of Ukraine.

[18] From June 4, 2009[19] to December 11, 2009 - the deputy chairman of the Security Service of Ukraine, the Head of the Main Department for Combating Corruption and Organized Crime of the SBU.

From December 11, 2009[20] to March 12, 2010[21] - the First Deputy Chairman of the Security Service of Ukraine, the Head of the Main Directorate for Combating Corruption and Organized Crime of the SBU.

[28] On 22 May 2019 newly elected President Volodymyr Zelensky appointed Ivan Bakanov Hrytsak's first deputy chairman of the SBU.

[29] In December 1999, Vasyl Hrytsak with a support of the SBU and the FSB personally detained Serhiy Ivanchenko, who was the organizer of a terrorist attack against Ukrainian presidential candidate Nataliya Vitrenko.

[30] On July 22, 2009, Oleksiy Pukach, former head of the External Monitoring Department of the Ministry of Internal Affairs of Ukraine, was detained and taken to Kyiv under the direction and with the personal participation of Vasyl Hrytsak in Zhytomyr Region.

The member of the French Senate Natalie Gule personally thanked Vasyl Hrytsak for his contribution to preventing terrorist attacks during the European Football Championship.

[38] In 2018, Hrytsak announced that the SBU had opened a case of a terrorist attack near the building of the Espresso Canal, which took place in October 2017.