From the early 1990s, she worked with various rural and urban councils, and NGOs such as the Danish International Development Agency (Danida), to evaluate public service projects.
[2][5] In 2009, she was one of the featured speakers at a conference held in Forlì, Italy, by the International Women's Network and the Hannah Arendt School of Politics, where she spoke about water and soil conservation projects in Tanzania.
[7] She cited that the difficulties in providing fully accessible water to all sectors of society were that the present system was not equally available to rural and urban settings, had previously not been well managed, and that commitments from local communities and donors had not been met.
[10] Lemoyan served on the EALA commission for the 4th assembly, along with other women including Oda Gasinzigwa (Rwanda), Mo-Mamo Karerwa (Burundi), and Wanjiku Muhia (Kenya).
[12] In 2018, she served on the central corridor delegation of the committee tasked with assessing the projects and facilities that support the East African Community's common market and custom's union integration.
[13] She served on the Natural Resources and Tourism Committee in 2019, which implemented a plan to plant cashew trees at the University of Dodoma in central Tanzania in a re-greening effort to combat drought in the region.