Actually, it was writing filtering and export code. Not a big deal, 80% of the brain sweat is logical expressions (which I think are easy) and the rest is just plug and chug for their parsing stuff- not that hard, and it is kinda fun. And I like that area, even if it is a bit remote even by my standards.

Still, I think I know what they actually were saying- "we like your brain, we just don't like you". I'm starting to wonder if one of my former employers is screwing me, and if I could prove it, I'd throw a lawyer at him so fast and so hard he'd beg me to shoot him instead.