Following the announcement of his resignation last week, government CIO John Suffolk said he is stepping down to allow more "fresh thinking and impetus to drive forward the [government's IT] strategy."
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"Having achieved what I set out to achieve it is time for me to get out of the way," he said in a blog post.
"I am a great believer in renewal and as new teams enter a business, or as in our case, government, it is important that they themselves can bring in new ideas, new policies and processes and, crucially, new people," he added.
"I know I leave our work in strong capable hands supported by a strong capable ICT supplier community."
Cabinet secretary Sir Gus O'Donnell said Suffolk had made his intentions clear in March that he wished to consider his position once he had fully supported the government in its first six months of office.
Suffolk has worked in the civil service for seven years and has been chief information officer and senior information risk owner since 2006. He was previously in charge of the IT aspects of the Labour government's joined-up justice plan to link police, courts and probation systems.
Cabinet Office minister Francis Maude said, "I'd like to thank John for his enormous contribution to the technology transformation agenda, and the civil service as a whole over many years."
In his blog post, Suffolk described the government's public sector spending review as the most demanding in a generation.