On the GDS blog, he has reminisced about his time at Whitehall, thanking the people he worked with and highlighting projects he particularly enjoyed.
Those named include digital champion Martha Lane Fox and former Cabinet Office Minister Francis Maude - according to Bracken, these people were responsible for bringing modern technology and the Internet generation to the heart of government.
He has also thanked former G-Cloud lead Chris Chant for showing him the ropes and "all the digital government pioneers who were here long before the advent of GDS."
During his time in government, Bracken was responsible for a number of high profile projects and just six months ago, he was announced as the first ever government Chief Digital Officer.
At this time, Maude described him as "spearheading the digital revolution."
Despite the pivotal role that Bracken has played in the digital transformation of government and the services it offers to the public, he believes he is leaving GDS in capable hands.
"I'm leaving government's digital delivery in capable hands - especially with the support we are getting from the new Minister for the Cabinet Office Matt Hancock," he claimed.
"The GDS leadership is strong, our plans are clear and focused, our people - and digital teams across government - are rolling up their sleeves to continue the work of transformation," he added.
The government CEO, John Manzoni, has wished Bracken the best for the future and praised him for his work.
"Mike has played a central part in developing a functional model at the heart of government and digital has paved the way for joining up the centre and departments into a single vision. I wish him the best for the next phase of his career," Manzoni claimed.