After applying online I was contacted for a 30 minute phone interview, then sent a proofreading test and a copywriting test. After I submitted those they scheduled me for a pair of panel interviews in the office during one day -- 4 current employees per panel. One consisted of the agency's management (president/founder, creative director, art director, senior copywriter) and the other consisted of the worker bees (graphic designer, social media manager, etc.). The following day they asked for references and instructed me to take an online personality test.
The interview structure felt deliberately confrontational; a bit like a Congressional hearing in front of a panel of people spread wide across your field of view. The president/owner in particular seemed bored and spoke bluntly. Maybe he's just too busy to spend much time sitting in interviews, or maybe he just didn't like me. He directly asked where else I was interviewing. This question struck me as a blatant power play. It definitely caught me by surprise. Be prepared for it.
Everyone else I interviewed with was friendly and normal. The total opposite of the boss.
After submitting everything they requested I heard nothing. No offer, no rejection. Nada. That result, plus the president's demeanor, told me a lot about the agency. It's clearly his shop; he explicitly described a previous ad campaign as something *he* did, not he and his team. This surprised me given the extensive lip service they pay to their belief in a supportive team culture.
I'm sure they had perfectly good reasons for not making me an offer. That's fine. Sadly the interview process left a bad taste with me.