Before he was posted to Mtwara, he served as Auxiliary Bishop of the Archdiocese of Dar es Salaam, from 16 February 2013 until 15 October 2015.
He then transferred to St. Peter's Minor Seminary, in the Catholic Diocese of Morogoro for his secondary school studies.
[1][2] While a priest, he served in various roles including as:[2] On 16 February 2013 Pope Benedict XVI appointed Monsignor Titus Joseph Mdoe as auxiliary bishop of the diocese of Dar es Salaam.
[1] Pope Francis, accepted the age-related resignation of Bishop Gabriel Mmole of the diocese of Mtwara, Tanzania, on 15 October 2015.
[3] As bishop in his diocese he urges his clergy especially newly ordained priests to have courage, exercise patience, make friends and prioritize God in everything that they do.