I didn't get hired for the job, after the first interview I bowed out. I ended up in another mostly Java position (although we've also started doing some Obj-C).

I had 4+ years of working on a reasonably sized and complicated Java application. In addition, a few years before I used Python for personal projects so I could show some experience.

But it turned out the position was largely for front end development, and not some of the more back-end stuff I'm interested in. I think they liked me (don't know how I compared to other candidates) but I thanked them for their time and told them the position wouldn't be a fit for me.

If your code in that language is good enough then you can usually get a job for it. Of course, I'm talking about places where programmer/HR department have a big overlap. I don't much like working for the other places.