1. It looks like you don't actually need peoples' HN password. Which people shouldn't be giving out. Update your website's copy!
2. This looks very similar to the Stackoverflow Careers' admin panel. Which is dandy. I'm interested to see how this goes.
3. Searching by geography would be useful, I think.
4. Could you elaborate on who you are, what your motivation is for building this, etc? (Do you plan on charging at some point?)
5. This is important because there is always an element of trust when using an employment service. By using a job posting service, you get insight into our openings, the types of people applying, our communications, and whether we are choosing to hire them.
Especially because your service has such robust communication/messaging facilities, I would be really interested to know what has brought this about before using it to recruit for my company. (We're hiring by the way!)
Good stuff! Looks slick, seems easy to use, and if you're able to keep it high-quality (how would one do that?) then I'm all ears.