Before establishing Nosa Capital, Olusegun worked in several areas of technology, which includes the pharmaceutical, the medical laboratory, and cosmetics industries. For a decade, Olusegun worked for Coates Lorilleux International as a chemist managing the production and quality assurance facilities. He later moved into the IT industry in 1999 becoming the Wireless Business Manager for Gavoa Ltd, a web, WAP, and online advertising firm.

In 2001, he became an IT consultant running his own firm – Foremain Consulting – specializing in XML technologies. He immigrated to South Africa in 2004 where he joined Ixixa Investments as Regional Manager. The following year he gained admission into the University of Pretoria where he graduated with an MBA in General Management with a research focus on the mobile industry. Olusegun also holds a BSc in Computing and a HND (Higher National Diploma) in Chemistry.