How do you engage with the Product Hunt community before and after your launch?

Definitely engage on social media in the weeks leading up to launch to build buzz. Post teasers, behind-the-scenes content, countdowns, etc. After launch, be super responsive to feedback, questions, feature requests, etc. Show that you're listening and rapidly iterating based on user input. Frequent updates and changelogs go a long way in keeping the community engaged post-launch as you keep making the product better!