Chris Chant, the director of the government's G-Cloud programme, is set to retire at the end of the month.
Chant, who has been assertive in his drive to change the way government buys IT, yesterday posted a blog blasting many of the government's chief information officers. He wrote that a number were not capable enough to make the changes needed in public sector IT.
The Cabinet Office said in a statement: "We are very thankful for the years of service and in particular, his recent success with the G-Cloud Programme. Chris leaves Government ICT in a strong position and we wish him all the best in the future."
It added that "the G-Cloud programme will continue following his departure", and that a decision on who to appoint next "will be made in the coming weeks".
Last week, the government appointed Liam Maxwell as deputy government CIO, reporting to CIO Andy Nelson.