He was the deputy of the Lviv regional council from 1994 to 1998, where he headed the Agrarian Party. From March 1997 to April 1998, Senchuk was the vice president of the Lviv-region state administration for agriculture and foodstuffs. On April 14, 1998, he was selected to be the chairman of the Lviv-region council.
On January 15, 1999, Senchuk was appointed as governor of the Lviv region; for some time he combined two posts. On March 19, 2001 he was dismissed from the post of chairman of the state administration. On July 5, 2001 he also retired from the post of regional council chairman.
Since 2005, Senchuk was a member of the National Union Our Ukraine party and a delegate of the constituent congress. Most recently he held a post at a chapter of the supervisory council of Lviv corporation, "Ecolan" (a food manufacturer).