Get used to the idea that someone isn’t necessarily there when you message. Try to predict when you’ll need to talk to someone and send the message with the info you need.
Document. Everything. Confluence needs to become your best friend. You and your colleagues rely on this information to keep up on things they might miss.
When you’re planning work, especially with lots of uncertainty, optimise to be inefficient. It’s better to start with 20-person calls at the start of a big project and cut them down later than to have 3-person calls and realise you missed critical people 2 weeks before your target date.
On the flip side, once you know what you’re doing, keep your status checks lean. Invite only the leads you need and write down the outcomes to share with the wider team.
Be willing to change your communication habits as you grow. A weekly all-hands is fine for a 10-person startup. It’s a monumental waste of time when you have 200 people across 5 departments.