Sub-Saharan Africa has a youth unemployment problem. The latest figures from the International Labour Organisation show more than one in five young people there are "NEET": Not in Employment, Education or Training. Structural issues like the lack of political stability in many countries and lagging infrastructure remain major barriers to high quality job creation. But the gig economy has been growing rapidly thanks to the proliferation of digital platforms. The The BBC's Wairimu Gitani reports.