Ask to have a coffee-chat / demo session with an engineer on the target team. You have decent odds you'll get someone senior who doesn't do all the interviews, so it will be much closer to the true day-to-day. You'll also get far more honest answers to things like on-call, support, performance reviews and other less-enjoyable aspects (even if it's by lack of omission, like they can only spare 15 minutes before their next meeting)