Vietnam Nano Technology Service (also known as Công ty TNHH Dịch vụ công nghệ Nano) is a company providing Flexible Payroll (EWA) solutions. Its product called VUIAPP is to enable workers to choose the day they get paid or opt to divide the monthly salary to get paid each day a certain amount of it. The app also provides a smart wallet feature designed to help clients spend money in a smart and frugal way. The company caters to employers.