Is there one thing you wish you'd known before you applied?

There hasn't been any such kind of single experience that would have made me think so, but many positive surprises for sure! However, I think the start of the work would have been even a bit smoother if I had known more about software development practices. For example, I was aware of the concept of dailies (short team status meetings every day) and most tools were at least somewhat familiar to me, but I hadn't been exposed to agile methodologies much before applying. Looking back, I think I didn't have a very precise view of what everyday work is like. However, I think that many needed skills can be learned along the way after starting in a new role.