Building KMP Libraries: The RevenueCat Story

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1. 

   S1 · E142 · 17 Nov 2025 · 1 hr 23 min

   Building AI Agents With Koog

   Sebastian and Márton talk to Vadim Briliantov, the Technical Lead for Koog: an agentic framework built by JetBrains. We learn about what AI agents are, and why building them in Kotlin with Koog is a great choice. We also discuss all the different ways AI agents can connect to other systems and your existing code, and look at advanced features for agents like custom strategies, model switching, and history compression. Resources: JetBrains/koog on GitHub Koog Documentation Hosts: Sebastian Aigner – Website | Bluesky Márton Braun – Website | Bluesky Guest: Vadim Briliantov – LinkedIn | Medium…

2. 

   S1 · E141 · 23 Oct 2025 · 2 hr 3 min

   Discussing Kotlin Coroutines with Marcin Moskała

   Sebastian and Márton chat with Marcin Moskała about coroutines. Resources: Coroutines Mastery course Coroutines | Kotlin Documentation kotlinx.coroutines Taming Asynchronous Beasts | Marcin Moskała Coroutine Debugging in IntelliJ IDEA | Alexey Merkulov Lifecycles, Coroutines and Scopes | Alejandro Serrano Mena Collect Like a Pro | Manuel Vivo Untangling Coroutine Testing | Márton Braun JetBrains/lincheck – Concurrent testing framework #talking-kotlin on Kotlin Slack Hosts: Sebastian Aigner – Website | Bluesky Márton Braun – Website | Bluesky Guest: Marcin Moskała – kt.academy Timeline:…

3. 

   S1 · E140 · 11 Aug 2025 · 1 hr 31 min

   kotlinx.rpc

   Sebastian and Alex chat about the kotlinx.rpc project, in a special episode recorded in the Munich JetBrains office. They explore all the different components of the library, how you can use it to define RPC services and clients, integrate with Ktor and existing gRPC definitions, and more. While the library is still experimental, it’s already feature-packed, and it has ambitious plans for the future! kotlinx-rpc on GitHub #kotlinx-rpc on Slack kotlinx.serialization on GitHub gRPC Host: Sebastian Aigner Website Bluesky Guest: Alex Sysoev LinkedIn GitHub

4. 

   S1 · E139 · 15 May 2025 · 57 min

   Powering TV Broadcasts Worldwide

   Sebastian and Márton are joined by Denis Borisevich from RIEDEL Communications, and learn about how Kotlin is used behind-the-scenes to power media, sports, and entertainment broadcasts watched by millions around the globe. Tune in for an exciting story about how Kotlin, Ktor, and Arrow are being used in production for a use case where robust software is mission-critical. Resources: Riedel Communications TornadoFX Unsigned integer types Arrow Ktor Eurovision Hosts: Sebastian Aigner – Website | Bluesky Márton Braun – Website | Bluesky Guest: Denis Borisevich – LinkedIn Timeline: (0:00)…

5. 

   S1 · E136 · 27 Mar 2025 · 1 hr 5 min

   Creator of Spring: No desire to write Java at All

   Sebastian and Márton chat with Rod Johnson, the creator of the Spring Framework. Rod tells the story of how Spring was born more than two decades ago, and shares his recent journey of coming back to the JVM and discovering all the fun of being a newcomer to Kotlin. Resources: Expert One-on-One J2EE Design and Development: Rod Johnson Oh the Places You'll Go! Shoulders of Giants: Languages Kotlin Learned From | Andrey Breslav Revamping and Extending Kotlin's Type System | Ross Tate Scala in 2018 Keynote | Rod Johnson But Java has pattern matching! | Alejandro Serrano Mena Hosts: Sebastian…

6. 

   S1 · E136 · 23 Jan 2025 · 53 min

   Becoming a KMP Expert

   Sebastian and Pamela discuss what it means to be an expert in Kotlin Multiplatform, with the help of a panel of experts! Learn about why it's interesting to dive deep into a certain technology, recommendations on how to learn advanced topics, and general advice on how to get the most out of using KMP. SKIE KMP libraries: whyoleg/cryptography-kotlin Interesting code to explore: JetBrains/kotlin Kotlin/kotlinx-datetime Kotlin/kotlinx-io Kotlin/kotlinx.coroutines Cartesian product by Jake Get an invite! Ecosystem wishlist: wasmJs support in SQLDelight Compose Multiplatform support in MapLibre…

7. 

   9 Dec 2024 · 1 hr 5 min

   Going from Swift to Kotlin with Skip

   In a slightly unconventional episode, Sebastian and Márton talk to the founders of Skip, an iOS-to-Android, Swift-to-Kotlin transpiler solution. Marc and Abe have a background working on both Apple platforms and the JVM, and their latest project is a bridge across these two ecosystems. Skip Skip.tools on GitHub Contributing to SkipUI webinar kdoctor Hosts: Sebastian Aigner Website Bluesky Márton Braun Website Bluesky Guests: Abe White Twitter Mastodon Marc Prud'hommeaux GitHub (0:00) Weather (2:02) Introductions (3:10) ⁠Elevator pitch⁠ (3:45) The initial idea (6:14) Pivot around the…

8. 

   E134 · 21 Nov 2024 · 46 min

   Platform Integrations in Kotlin Multiplatform with Russell Wolf

   Sebastian introduces the new co-host of the podcast, in a special episode recorded on location at droidcon New York! Joined by Russell Wolf, author of the multiplatform-settings library, we discuss the conference, different code sharing approaches for Kotlin Multiplatform, and how to build great multiplatform libraries. droidcon New York When sharing isn’t caring: Using platform-specific code in Kotlin Multiplatform (Russell’s talk) Compose Multiplatform on iOS: On the Road to Stable (Seb’s talk) Composing an API the *right* way (Márton’s talk) The deprecated Accompanist WebView…

9. 

   29 Aug 2024 · 1 hr 7 min

   Kotlin After 2.0

   In this episode, we talk about the future of Kotlin and its development after the 2.0 version.

10. 

    3 Jul 2024 · 49 min

    Reinventing Ticket Sales with Pretix

    In this episode of Talking Kotlin, Hadi Hariri and Sebastian Aigner chat with Raphael Michel, the founder of pretix, an open-source ticketing system. Raphael shares his fascinating journey, from building pretix to solve a conference ticketing problem to becoming a full-fledged company with a global reach. The conversation dives into the complexities of event ticketing, the challenges of the pandemic, and the surprising new markets pretix entered, like managing access for public swimming pools in Berlin. Throughout the episode, Raphael discusses how Kotlin plays a crucial role in pretix's…