Called to the Nigerian Bar, he started his career with the law firm then known as Ajumogobia, Okeke Oyebode & Aluko honing his skills in commercial law and litigation. He also had served in the Banking and Asset Management sector, culminating in the role of pioneer Vice President, Legal & Compliance of Nigeria’s leading Asset & Investment Management firm, Asset & Resource Management Company Ltd, ARM.

He joined Shell Petroleum’s Nigerian operations in 1996 as Legal Adviser, Contracting & Projects, and was pioneer Legal Adviser & Company Secretary of Shell Exploration & Production Africa Limited, following creation of its African regional office in 2004.  He transferred to The Netherlands in 2005 as Senior Legal Counsel supporting Engineering Procurement & Construction (EPC) Contracts for Shell’s global Gas & Power Business where he maintained responsibility for supporting Group Engineering Procurement and Construction projects in Africa, China, Western Europe, and South America.

He returned to Nigeria in 2009 to assume the role of Country Head of Legal & Group Company Secretary for all the Shell Companies in Nigeria.

In 2012, he joined Addax Petroleum Nigeria, as Deputy Managing Director, overseeing its External, Government & Regulatory Affairs, Human Resources & Admin, Legal, Community Relations, Security & Supply Chain Management Business Groups. He voluntarily retired from Addax in January 2022.

Tunji also sits on the Governing Council of a Nigerian private university, Davidson, and a UK based NGO & Charitable Organisation, Chestrad, from where he has championed the establishment of several programs in Nigeria to support health systems, social development, women and the girl child.