Former country manager for Australia, Ian Dunbar, has been named as SuiteBox's chief executive, with Mannell moving into the newly created role of chief operating officer.
In a statement, SuiteBox said the change in leadership was affected to support business growth.
“The changes reflect the positioning of SuiteBox as a global provider of solutions to the financial services industry,” said Mr Dunbar.
“The majority of SuiteBox’s growth has come from Australia, and the business priority for 2016 is to rapidly expand in Australia and take the SuiteBox solution to new markets,” he said.
As chief operating officer, Mr Mannell will focus on governance and operations.
Mr Dunbar has help previous positions with JP Morgan and UBS. He was responsible for building and running the investment platform for UBS.