This feels like a very bizarre propaganda / pro-military opinion piece. Google isn't a defense contractor, its employees aren't any more or less patriotic if they don't want to build software that goes in killbots.
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Google and all the other mega-tech corps do a similar tech phone screen where they're reading off an answer sheet. (powers of 2, sort these functions, linux kernel calls, etc).
Sounds like you dodged a bullet, this sort of thing speaks volumes to how the company is run internally and how you'd be treated there.
Came here to say +1 to this, definitely employ a bastion host and make sure that's the only way to SSH to your servers. This can be a little tricky to do correctly if you don't have someone on your team, but it's a valuable way to reduce your surface area to monitor.
Installing fail2ban is also a very basic / smart way to discourage brute force SSH attacks on your boxes. Also you could try piping your SSH logs into something like papertrail / slack, so you have clear visibility into who's logging into your servers, etc.