How do I coordinate across teams without getting overwhelmed?

You do your own work well, but coordinating across functions overwhelms you, because suddenly you are tracking not just your job but everyone else's, and the number of moving parts feels endless. That overwhelm is not a sign you are out of your depth. It is a sign you are trying to hold it all in your head. Coordination is not about knowing everything. It is about knowing who owns what and where the handoffs are. You do not need to carry every detail; you need to see the seams between people and make sure things do not fall through them. That is a smaller, calmer job than the one you are imagining. Write down each team, what they owe, and when. Keep it somewhere you can look instead of memorize. Then your job shrinks to watching the handoffs, not holding the whole machine. Let the list carry the weight your mind was straining to hold, and the overwhelm loosens its grip.