At the heart of the plan is Starbucks' "Siren Craft System," a series of processes that aim to make baristas' jobs easier and speed up service times for customers. Starbucks said more than 10% of its 10,000 stores have already implemented the system, which includes changing the production order for hot and cold drinks. Starbucks reported rates of incomplete mobile app orders in the mid-teens and said occasional customers came in less. Losing customers because of slow orders and other store frustrations could cost Starbucks at a particularly vulnerable time. The company plans to train existing workers for the role or potentially add new baristas, if needed.

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Persons: Beata Zawrzel, Laxman Narasimhan, Katie Young, Peter Saleh, Young, Howard Schultz, Narasimhan, Schultz, Macoy McGlaughlin, Walker, we're, McGlaughlin, Baristas Organizations: Starbucks, Nurphoto, Getty, CNBC, Workers Locations: Krakow, Poland, North America