The senior director of core infrastructure at Google has departed.

Mike Curtis is leaving the search and cloud giant after 18 years and 10 months at the business.

Google Cloud
– Sebastian Moss

"While I’ve spent an astonishing 46 percent of my life on Earth in the company of Google, I have in turn witnessed 73 percent of the life of Google," he said in a LinkedIn post.

"As such, the Google I say goodbye to today is – for worse and for better – simply not the same company I greeted many years ago."

Curtis was one of the company's first site reliability engineering leads, helping maintain uptime at Gmail during its launch. He was also the funding and lead SRE for Google+, the company's failed social media platform.

From there, he became the head of the core infrastructure team, running a 250-person engineering organization. In the role, he created Google's Server Platform offerings, migrating Search, YouTube, Google Cloud, and other software repositories to this stack.

"I’m grateful for the years, but eager to venture forth," Curtis said. He leaves after the birth of his third daughter: "This parental leave was my most refreshing and rewarding simply because I decided to liberate myself mentally from any concern of returning."

Curtis has not announced what he plans to do next.