Some companies have trade secrets. Do you think Google is really going to let you come in and poke at the Search stack for a week just to see if you're hireable

Some companies have trade secrets. Do you think Google is really going to let you come in and poke at the Search stack for a week just to see if you're hireable? This isn't about the number of departments. This is about companies needing to make very real tradeoffs between maintaining their current speed/security/stability and investigating future talent.