In 2004, he was appointed Clerk of the East African Legislative Assembly where he served for five years. In 2009, after five years of duty, he resumed duties at the National Assembly and served as Chair of several Committees; Committee on Implementation of the Constitution, Tender Committee, Projects Management Committee and Vice-chair of the Steering Committee of the Centre for Parliamentary Studies and Training. He has attended several courses and attachments in Legislative Management and Administration.

In October, 2012 he was appointed Clerk, of the National Assembly.

Honourable Muturi has served Kenyans in the Judiciary for than 15 years, where he rose up the ranks to retire as a Principal Magistrate in 1997. During his tenure in the Judiciary, he was elected the Chairman, Kenya Judges and Magistrates Association.