We thought we did, but he was fairly well practiced at getting fired so I guess he knew the signs.
You can interview all you want but still end up hiring a bozo.
There’s so many places where an IT guy can leave backdoors into companies, it can be frightening. This is especially true with a web developer and an ‘outward facing’ web site/server. Periodic security audits by an outside party, and following ‘best practices’ are a MUST.... and that can STILL not be enough. Hiring honest/professional people and treating them well is actually the best thing a company can do. Easier said than done, of course.