Barclays Capital, the investment banking division of the UK bank, is looking for a head of global technology operations and strategic planning after the departure of Kevin O'Reilly.
O'Reilly, who ran Barclays Capital's IT operations for nearly four years, left in March and has not joined another group. He declined to comment last week.
Sources close to the former head of technology said he was weighing up several options and was likely to announce his decision in the next few months.
A spokeswoman for Barclays Capital confirmed O'Reilly's departure. She said: "While we search for a replacement for Kevin, Betsy Konvalinka has assumed interim responsibility for global IT."
Konvalinka is head of UK and European operation at the bank.
O'Reilly was appointed global head of finance, planning and information technology in 2001. He joined from Booz Allen Hamilton, a strategic management and technology consultant, where he had worked for seven years as a partner and head of capital markets.
Before that, O'Reilly worked at Lehman Brothers and Credit Suisse First Boston, where he developed a global trading system.