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Watching professional cuppers at work is like watching a silent ballet with tasters swirling around the table in choreographed moves.

Ms. Mugaruka, 24, is one of few cuppers, or coffee tasters, from the eastern part of the Democratic Republic of Congo and the only woman working as a cupper in the region.

Many of its warehouses are in remote rural areas, where it employs a local workforce, including “cuppers” it trains to run quality testing.

Before the beans reach your favorite store, a "cupper" evaluates the beans by sight, smell and taste.

The company’s cuppers–expert coffee tasters–spend three months perfecting the medley.