First, you should note that eCommerce web development is not a short-term game. It involves a long process of maintenance and constant updates. So, make sure to hire an eCommerce web development agency that can take care of your every requirement including development, deployment, support, and maintenance.

Also, choose a company that has prior experience in building eCommerce websites. Make sure to talk directly with the development experts so that you know they have understood what they have to do for your business.