[citation needed] While there, he was an active member of the Dramatics Society, leading the school's English play to the National Festivals competition.

In this capacity, he was responsible for developing and supporting the execution of programs that extend HIV/AIDS care and treatment services to low-level health facilities, in participating countries.

He also played catalytic roles across the firm, including pioneering the Agriculture & Food Security practice; chairing the Strategy, Impact & Quality Committee, one of two governing bodies in the firm; and incubating Dalberg Implement, which allows Dalberg to take strategy recommendations and work alongside its clients to bring them to life.

[1][4][5] At the end of 2019, Macharia was elected as Global Managing Partner at Dalberg Advisors, leading the firm across world He also continues to support clients on a range of issues including strategy, operational efficiency, and program implementation.

[1][2] [4][5] Macharia was named on Forbes’ 10 Most Powerful Men in Africa in 2015 and was recognized as a World Economic Forum Young Global Leader in the same year.

[6] As of December 2020, he serves as a global board member of The Nature Conservancy,[7] Nabo Capital and the Governing Council at Amref University.