A few months ago, brothers Hai Nam Bui and Hai Long Bui were developing a bookkeeping app for small retailers in Vietnam. Called SoBanHang (or “sales book”), it would help businesses that usually rely on paper ledgers digitize their operations, similar to Khatabook in India and BukuKas and BukuWarung in Indonesia. Then a new COVID-19 outbreak hit Vietnam. The businesses SoBanHang had been working with, which are often family owned and have less than five employees, struggled to cope. The team held a hackathon and came up with a new product for retailers to create online stores and manage orders. Since launching three months ago, SoBanHang’s “hyper local e-commerce