Scott Marcar, CIO for corporate and institutional banking (CIB) at Royal Bank of Scotland, is leaving the bank to take up another opportunity.
His role will be filled on an interim basis by Adam Wheelwright, who is currently head of prime, collateral and operations technology at the bank.
A spokesperson for RBS said that the bank does not comment on individual members of staff, but did not deny the role changes.
Marcar's departure, first reported by Computer Weekly, follows that of Mike Errington, head of IT at RBS, who announced his retirement in April.
Marcar joined RBS from investment bank JP Morgan in 2007 and was appointed CIO of markets within the markets and international banking division in November 2012, reporting to operations head David Shalders. He had been at JP Morgan since 1993.
RBS recently announced plans to invest £1 billion in its digital transformation. For example, it has fit out more than 400 branches with iPads to help customers sign up to online banking. It also provides free in-store wifi for personal devices, and upgraded its ATM network.
In addition, mobile banking applications for retail customers and small businesses will be integrated to allow transactions for both accounts via one app.The bank said the £1 billion will also be targeted at further work to improve resiliency of legacy systems, having already earmarked £750 million over three years.
The investment follows the announcement of a major project to rationalise its legacy IT estate earlier this year, as the bank seeks to prevent recurrences of outages that have beset customers in the past.
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