Her career spans over 20 years in various high-profile roles across leading companies in different sectors, including telecommunications, financial services, and digital marketing.

She has held several senior management positions, including Managing Director of MultiChoice Kenya, Vice President for Market Development in Sub-Saharan Africa at Mastercard, and Chief Digital and Marketing Officer at HF Group.

Her leadership at MultiChoice Kenya, starting in December 2019, marked her as the first female Managing Director of the company, a significant milestone in a male-dominated industry.

In 2018, recognizing the need for more focused and inclusive solutions in financial and educational technology, Matimu founded Serrari Group.

This transition from corporate roles to entrepreneurship was driven by her desire to leverage her extensive experience to create impactful solutions that address the unique challenges faced by individuals and businesses in Africa​.

At Serrari Group, Matimu aims to foster growth and financial freedom in Africa through innovative fintech and edtech solutions.

The company’s mission is to create the easiest, simplest, and most versatile online education platform, financial literacy platform, and a comprehensive digital financial services marketplace.

Matimu holds an MBA from Strathmore Business School and IESE Business School, a Bachelor’s degree in Environmental Studies from Kenyatta University, and a diploma in Marketing from the Chartered Institute of Marketing, UK.

She is also involved in various educational and business boards, serving as the Vice-Chairperson of the University Council Board at KCA University and as a Global Board Trustee at Education Sub-Saharan Africa (ESSA).

She has been recognized as one of the top 100 most influential women in Africa in 2020 for her contributions to the digital economy.

This recognition underscores her impact and influence in the business world, particularly in Africa​.