I make and maintain non-HubSpot-hosted websites, and I've been working on and off with HubSpot's platform(s) for a few years. I work mostly with HS's form embed javascript in external websites, but also have experience in using personalization tokens in email, passing data to other platforms, workflow management, and implementing and using web events. I try to provide helpful solutions to marketers, so you're welcome to pick my brain on practical or technical issues you're having with making the platform work for you and your website.