Once a Google engineer after the search giant acquired his company FeedBurner, Costolo suggested that Google may have lost its moral compass.

CNN: Mark Milian,

Now he's a software engineer for Yahoo's search service.

FORBES: Companies, People, Ideas

On his hippy quest in the mid 1970s, Jobs backpacked around India with a college friend -- and, later, the first Apple employee -- engineer Daniel Kottke, in search of philosophical enlightenment.

CNN: Why Apple's Steve Jobs is so fascinating

Matt Cutts, the engineer charged with reworking Google's search algorithm, articulates his mission differently.

FORBES: On The Cover/Top Stories

Potential employers can search the database by clicking on job titles such as engineer, electrician and general labor.

CNN: Out of a job and finding work for others

Mark Lucovsky, a legendary Microsoft engineer now at Google, recently released a Google search box optimized for mashups on a user's own Web site.

FORBES: Why Google Loves The Little Guys

Mayer, 36, joined Google in 1999 as its first female engineer and 20th employee and quickly ascended the executive ranks, first as VP of search and now as VP of local and maps.

FORBES: Will Google's Marissa Mayer Help Solve Wal-Mart's Woman Problem?

The UK operation is among those expanding rapidly, as I found out this week when I met the engineer in charge of one of the firm's most important ventures, Graph Search.

BBC: Facebook grows up

Invented by engineer and entrepreneur Jonathan Rothberg, such desktop gene machines could transform medicine, agriculture, nanotechnology and the search for alternative fuels.

FORBES: Magazine Article

Recruiters can search for people in those networks who work at a particular company or list a particular job title, such as engineer.

FORBES: BranchOut Launches Recruiter Tool For Searching Facebook