I’ve noticed that my most productive coding sessions happen late at night or early morning when the corporate chat is quiet. However, this isn't sustainable for long-term health.

How do senior engineers at high-growth companies manage to get 4+ hours of "Deep Work" daily without being seen as unresponsive? Do you have specific calendar strategies or cultural hacks that actually work?

Put all notifications to silent, except for the calls. Explain to everyone that, to get your immediate attention they have to call you. Look at your (now silent) messages when you have spare cycles (in between the focused sessions).