What work at every level actually involves
At entry level, a week is structured by a shift. You clock in, pick up a task list or a queue from a shift lead, and work through it — moving stock, serving customers, preparing orders, entering data, cleaning down, closing out. Tools are usually a handheld scanner, a point-of-sale terminal, a ticketing or order system, a radio or headset, and whatever app the employer uses to post shifts and swaps. Training is on the job: you shadow someone for a few shifts, then work alongside them until you can run the task alone.
Mid-level roles spend less time on the task and more on the sequence. You open or close, assign people to stations, and handle the exceptions the system cannot — a late delivery, a short-staffed shift, an upset customer, a failed scan. You keep records that someone above you reads.
Senior roles move onto a different clock: reviewing last period's results, forecasting the next one, interviewing and training, approving time, handling escalations, answering to a regional contact you may rarely see in person. Hours become less fixed, and the measure of the job stops being tasks finished and starts being results held.
How many layers exist varies by employer and by industry. A small independent operation may collapse all three into two people; a large organisation may have four grades between you and a salaried manager.