Before his current position, Engr. Makoju was Chief Operating Officer, Dangote Cement. He has worked in several world-class organisations including Shell-BP; Blue Circle (UK) and WAPCO which he headed as Managing Director/CE for about a decade before taking up an appointment as Managing Director/CE of National Electric Power Authority (Power Holding Company of Nigeria).

Engr. Makoju served as Special Adviser (Electric Power) to the President, Federal Republic of Nigeria under two separate Administrations and is presently Honourary Adviser on Electric Power to the current President/Commander-in-Chief, Federal Republic of Nigeria. He is Chairman, West African Power Pool Executive Board as well as Chairman, Cement Manufacturers Association of Nigeria.

He belongs to several professional bodies including the Nigerian Society of Engineers, Nigerian Institute of Management and British Institute of Mechanical Engineers.