Birsan is a retail B2B platform used by cashiers and inventory managers across multiple retail locations. The mobile app is the primary tool for cashiers processing sales on the floor — scanning items, building a cart, and completing payment transactions under constant time pressure.

Through field observation sessions at 3 retail locations and interviews with 8 cashiers, I mapped the core frictions in the sales cart flow. The original interface was a numbered text list with no visual product identification — fast to build, but unreliable under pressure.

Mapping the end-to-end flow revealed that critical problems clustered across three steps: Cart Review, Edit Item, and Payment. All three were redesigned over a 3-month cycle alongside active development.

Drag the handle to compare the original cart and the redesigned version side by side.

Before

After

The old edit flow reused the "Add item" modal — same UI, different intent. The new design is a dedicated full-screen editor with clear sections, visible price breakdown, and a single save action.

Before

After

The original payment flow split amount entry and confirmation across two screens, creating context switching under pressure. The redesign merges both into a single unified screen — payment method, amount, quick-entry banknote buttons, and the total are all visible at once.

Before

After

The redesigned cart shipped after a 3-month design and development cycle. Usage data from retail locations showed a measurable drop in cart correction events and an overall improvement in cashier confidence during checkout.