[greenyoda]

"Perhaps a better method might be to have the developer work with the team on a probationary period before being extended a full offer."

Why should someone risk quitting their current job (and possibly relocating) to go work for a company that only gives them a job offer contingent on a probationary period?

[johnfuller]

True, but if it's a bad cultural fit then you will probably quit anyways.

If the new offer was good enough to quit your current job, then you were probably ready to leave anyways.