In August 2020, Citibank's lending operation made a huge digital banking error.
Instead of the intended interest payment of $7.8 million, the complete sum of $900 million was sent due to a user interface blunder.
This incident is one of Citibank's most significant digital banking mishaps, highlighting the importance of flawless user experience design and robust internal processes as the blunder resulted from a lapse in user interface design of the banking software, leading to an unintended transfer and later, legal issues.