Tanzania population is growing rapidly and young people make up the largest and fastest growing proportion of the population. Projections of the National Bureau of Statistics (NBS) indicate that the urban population is expected to reach 45 million in 2030, making Tanzania the 6th fastest urbanizing country in the world. Dar es Salaam is expected to become a megacity with a population of 10 million people by 2035, making Dar es Salaam the second fastest growing city in terms of population in the world. Similar growth is expected to happen in other cities in Tanzania. There’s a need to avoid repeating mistakes in managing urbanisation in primary cities to make secondary cities smart and sustainable. TangaYetu initiative addresses the urbanisation challenge by building city ecosystem that support health and wellbeing of young people in Tanga.