Ndagi was the National President of the Academic Society for Arabic Language and Literature in Nigeria[3] (ASALLIN) for two terms of two years each (2013–2017).
He has published five single-author books including a collection of poems titled Musings in the dark (2005);[4][5] and The Phonetics of Nupe Language and its Transcription with Arabic Symbols (2000).
Ndagi's research interests include stylistics and contrastive linguistic analysis between Arabic and Nupe languages with specific reference to the phonetics, rhetoric and morphology of the two.
Ndagi's membership of professional bodies includes being the Chairman of the Federal Capital Territory FCT branch of the Nigeria Association of Teachers of Arabic and Islamic Studies (NATAIS) 2001–2009.
Muhammad Umaru Ndagi taught for three years as a Grade II teacher at the Waziri Primary School, Agaie, Niger State (1979–1982).
He was at the Nigerian Educational Research and Development Council (NERDC), Abuja, Nigeria for a 12 months sabbatical leave; from May 2016 to April 2017.
Ndagi is the secretary to the Board of Trustees for the Babba Center for Historical Documentation and Research (BACHIDAR) located in Agaie, Niger State, Nigeria.
Ndagi was presented with a Meritorious Service Award in 2013 by the Abuja branch of the Nigeria Association of Teachers of Arabic and Islamic Studies (NATAIS).
He also received a Merit Award in 2004 for the Longest Serving Academic Staff at the 20th Anniversary of Federal Government College, Kwali, Abuja.