In 2005 she left and moved to Chicago, Illinois, to work at InterCall Inc. A year later, she joined National Seminars Group, where she designed and maintained SQL Server databases.

Ushahidi was first put into practice during the Kenyan presidential election crisis of 2007–2008; it has since been used in Chile, Japan, New Zealand, Australia, Pakistan, Tanzania, and Haiti.

As a public speaker, she is known for her commentary on technology in Africa and voicing concerns about the loss of indigenous forest and water catchment areas in Kenya.

[4] To help solve the lack of internet access due to blackouts in Nairobi, Rotich co-founded BRCK Inc., which produces a battery-operated modem that can run for eight hours without electricity.

From 2014 until 2015, she served on United Nations Secretary-General Ban Ki-moon's Independent Expert Advisory Group on the Data Revolution for Sustainable Development, co-chaired by Enrico Giovannini and Robin Li.

[6] In 2017 Rotich participated in the W20 Summit in Berlin, Germany and took part in a panel discussion together with Chancellor Angela Merkel, IMF director Christine Lagarde, Queen Máxima of the Netherlands, Canadian Minister of Foreign Affairs Chrystia Freeland, Ivanka Trump and others, where she represented BRCK.