[lj3]

> Developers who fail to check their own work, or do it so hastily they don't notice glaring mistakes, or who are rushing so much they don't / can't follow a simple spec.

You would actually fire somebody for being unable to keep up with a deadline they didn't set? In my experience, this is mostly the result of management placing too strict a deadline on too junior a dev. It's a mentoring moment, not a firing one.

[wanderr]

None of these are things that directly lead to firing (aside: deadlines shouldn't just be handed down to developers, and deadlines shouldn't be so rigid there's no room for mistakes), of course you try to mentor and provide guidance to correct. But these traits are regrettable in a hire because in my experience these are the most difficult to deal with or correct even over a long period of trying.