This month marks Michael Harte's eighth year as Commonwealth Bank's chief information officer - making him Australia's longest serving big bank technocrat.During the past six months all of the other majors have announced a switch at the top of the technology tree - most recently ANZ, which last week announced that CIO Anne Weatherston was stepping down after four years in the role. Both ANZ and Westpac are currently engaged in global searches to find new CIOs, as is Westpac New Zealand, which last month announced plans to merge its chief operating officer and CIO roles.National Australia Bank has had three different CIOs in the past 18 months. In November 2012 then CIO Adam Bennett took on a new overarching technology role in the bank, to be replaced in April 2013 by Denis McGee. McGee himself has since been replaced by EY partner (and former Commonwealth Bank technologist) David Boyle, who took on the NAB CIO role earlier this year.Harte was not available for interview yesterday about his own career plans, but having successfully completed a major core systems revamp which positioned CBA for rapid product and service development, he would be an attractive candidate for similar transformational roles around the world.That is something he has expressed interest in previously, although with school-aged children he may well feel tethered to Australia.Harte also benefits from the ongoing support of CBA's technophile chief executive Ian Narev, although he lost his tech savvy marketing ally Andy Lark last year, when the former Dell executive left the bank.At Westpac, although the CIO role has yet to be permanently filled (Paul Spiteri continues as the acting CIO) the bank has created a slew of divisional CIO positions to populate the technology structure established by Les Vance, who was appointed chief operating officer for technology last December.Yesterday a Westpac spokesman confirmed a report in iTnews that BT Financial CIO Richard Holmes has been named Westpac's CIO of retail, business banking and wealth; St George CIO Dhiren Kulkarni will take on a new role as CIO for the core systems revamp (which will see Westpac move to the CSC Celeriti platform) later this year; Lloyd's CIO Mike Wood will become CIO of banking systems; and Tina Conlon is to be CIO of enterprise systems and services. Westpac's payments CIO role has yet to be filled.The bank issued a statement saying that the new group technology structure would provide a "stronger focus on technology innovation and strategy, as well as delivery and operations" and "accelerate our momentum to deliver on the 2017+ strategy." It said no jobs would be lost as a result of the changes.Meanwhile, at ANZ, group chief operating officer Alistair Currie last week took control of the bank's technology reins until a replacement CIO is found. ANZ is only one of the four majors without a core system revamp remit. Weatherston maintained a relatively low profile, leaving ANZ Australia's CEO Phil Chronican to be the public face of ANZ innovation.