Early in my career, I worked with a web designer to build a heavily customized LemonStand e-commerce website for The Curling Store, a local curling equipment retailer, to reflect how the business actually worked.
I communicated directly with the business owner to understand what they needed and took primary responsibility for the mobile layout, helping the site reflect their business and their users.
I still remember this project because it reinforced something important: understanding the people using a website matters as much as understanding the business behind it.