Workers at a Starbucks with a menu overhead.
Starbucks' mobile ordering system has become a challenge for store employees to manage, one told BI.
  • Starbucks customers often face long lines to get their drinks at the chain's cafés.
  • One Starbucks employee in North Carolina said the problem goes back to understaffing.
  • A constant deluge of mobile orders also complicates employees' workflow, the employee said.

At a Starbucks cafe in North Carolina, the biggest problem isn't getting complicated customer orders right. It's that there aren't enough employees to serve them.