If you're trying to build something quickly, it's not a bad idea to use an existing style and layout to just get it done. Thinking about design too early can be an unneeded burden. I wouldn't propose they go live with it, but it's fine for early development.
I respect that it works well, but there's a difference between using a style as inspiration, and outright ripping it off. This strikes me more as the later.
(I think Google won't mind.) It doesn't really show in the screenshots but it does feel a little different from the Gmail/Google style when you actually use it. But your comment is fair enough, it is quite close.
This is a great idea, though probably not for everyone. I'm evaluating a whole slew of ones right now and could use the feedback and advice, especially being a "soloist". At some point I may put my short list together for advice, votes, and any other type of feedback. Good luck!
From the first link: "App to make hiring easier. Enter your jobs, submit, and we auto-submit to all the relevant jobboards that you check. When candidates apply, easily define your screening process and move them through it with your team. Pay X$/month."
