Marcin Moskała is the author of the Kotlin for Developers Series. In this interview, Leanpub co-founder Len Epp talks with Marcin about his background, Kotlin, his book series, and at the end, they talk a little bit about his experience as a self-published author.This interview was recorded on January 24, 2023.The full audio for the interview is here: https://s3.amazonaws.com/leanpub_podcasts/FM252-Marcin-Moska%C5%82a-2023-01-24.mp3. The Frontmatter podcast is available on our YouTube channel at https://www.youtube.com/leanpub, in Apple Podcasts here https://podcasts.apple.com/ca/podcast/frontmatter/id517117137 or with this direct link https://podcasts.apple.com/ca/podcast/frontmatter/id517117137, on Spotify here https://open.spotify.com/show/00DiOFL9aJPIx8c2ALxUdz, and almost everywhere people listen to podcasts.This interview has been edited for conciseness and clarity.