Matongo worked for the City of Johannesburg's housing department before he became deputy director of youth development in the municipality.

In 2011, he was appointed a strategic support advisor in the office of the Member of the Mayoral Committee (MMC) for Finance.

[5] In April 2021, he announced a new debt rehabilitation programme for people affected by the COVID-19 pandemic and struggling to pay their mortgages.

[6][7] In May, Matongo promised increased spending on the townships and informal settlements of Ivory Park, Kliptown and Orange Farm,[8] and gave 19.9 billion rand to the City Power company for infrastructure improvement.

Earlier that day, he had campaigned in Soweto with President Cyril Ramaphosa and Gauteng Premier David Makhura ahead of the municipal elections scheduled for 1 November 2021.