[1][2] Mawejje holds a Master of Science degree in Human Resources Development, obtained in 1993 from the University of Manchester in the United Kingdom.
[1][3] From 1996 until 1998, she worked as a human resource manager for Care International in Uganda, based in Kampala, the capital and largest city in the country.
In May 2009, Unilever hired her as the Human Resources Regional Director for Eastern and Southern Africa, responsible for the company's staff in 7 African countries.
In January 2012, Centenary Bank hired her as the Director of their Human Resource Division, a position she had served in for almost six years as of November 2017.
She has been a member of that board since 2015[4] and (d) Umeme Limited, the largest electricity distributor in Uganda, whose shares trade on the USE and on the Nairobi Stock Exchange (NSE).