Kilian is from the North West region of Cameroon, born in 1981 into the family of Mr Ngwainmbi Joseph. He is now married with two children.
After obtaining his advanced Technician Diploma in tendering estimating, quantity surveying and construction management in 2003, Kilian gained employment as a Senior Technician/Quantity Estimator at the Cameroon Baptist Convention. In 2010, Kilian obtained an industrial safety Diploma from Natalien Cameroon and continued his services with the Cameroon Baptist Convention health services as a Senior Technician and Procurement Officer.
In 2012, Kilian was promoted as the Principal of a National apprenticeship and vocational training Centre in Cameroon (under the Cameroon Baptist Convention Health Services) where he worked for one year and later decided to go for a more challenging job before joining Vallis Commodities Ivory Coast Limited as a reporter and administrative assistant in November 2013. Kilian was later appointed as Operations Supervisor in January 2015,