Liza Landsman, Citigroup's US head of online and mobile banking is leaving the bank a year after being put in charge of its consumer Internet and mobile division reports Bloomberg.
Citing "people with knowledge of the matter", the wire says 41-year old Landsman tendered her resignation last week.
A former IBM exec, Landsman had worked at Citi since 2000 and was appointed to her current post in August 2009 by then-North American consumer banking chief Terri Dial.
Under Landsman's tenure, Citi has rolled out a wave of of innovative online and mobile banking apps in line with Dial's vision of tranforming the behemoth into a tech-led 'bank of the future'.
Recent innovations include the launch of the Citi Shopper bargain-hunting app and the introduction of contactless payment stickers.
The quick-to-market strategy backfired last month when a Citi mobile banking app for the iPhone was found to have a security flaw which backed up and saved user account information to a hidden file on consumer handsets.
Landsman's champion Dial was herself let go in January and replaced by Manual Medina-Mora, who has developed his own strategy, says Bloomberg, pointing to the recent hire of PayPal's Dickson Chu as innovation chief for Citi's US retail cards business.