Take-home assignment asking questions about the product, some of the questions don't have a correct answer -their just picking your brain to see how you think. Chat via google hangouts, testing your ability to follow directions and your basic understanding of the product. An on-site interview where you bring to the onsite interview an ios or android app that you built. The app is simple, a button that changes the background color. They hook the app up to their product and ask you basic questions about how it works and what it's doing. Not too hard.
The hiring manager is a micro-manager who says he takes a hands-off approach but as soon as I had a conversation with him I got the feeling that this guy likes to be up in your personal business. He frequently will interrupt you mid-sentence.
The recruiter was also unprofessional. He walked me out of the office and said we will let you know at the end of the week. After a phone-screen, take home challenge, google hangout conference call, onsite interview, never heard from LeanPlum again.
The atmosphere of the office is gear towards an older crowd too. Not a place someone in their twenties would have fun working at.