Every time you tap through a subway gate in New York City, you’re using Kotlin Multiplatform! In this episode, we sit down with Paweł Kwieciński from Masabi to explore how they brought a decade-old Java codebase to KMP, powering ticket validation across mobile apps, embedded devices, and backend systems for public transit agencies worldwide. Resources: Masabi J2ObjC (Java to Objective-C translator) Google Workspace Migration to Kotlin Large Scale Changes with AI – Uber | Ty Smith KotlinX DateTim...
Mar 05, 2026•1 hr 39 min•Season 1Ep. 145
Sebastian and Márton host a special, audio-only episode where they discuss everything that’s new and noteworthy in the Kotlin 2.3 release. They touch on new language features like the unused return value checker and explicit backing fields, previously added features that became stable in this release, new APIs for time and UUID handling in the standard library, and improvements across all Kotlin platforms — from Native to Wasm and JS. Resources: What’s new in Kotlin 2.3 KotlinConf Golden Kodee C...
Feb 03, 2026•50 min•Season 1Ep. 143
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...
Nov 17, 2025•1 hr 23 min•Season 1Ep. 142
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 – Web...
Oct 23, 2025•2 hr 3 min•Season 1Ep. 141
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...
Aug 11, 2025•1 hr 31 min•Season 1Ep. 140
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 | B...
May 15, 2025•57 min•Season 1Ep. 139
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 ...
Mar 27, 2025•1 hr 5 min•Season 1Ep. 136
Sebastian and Márton discuss building KMP libraries with Jay Shortway, the author of RevenueCat’s Kotlin Multiplatform SDK for in-app purchases. Resources: RevenueCat KMP SDK How we built the RevenueCat SDK for Kotlin Multiplatform Hybrid SDK Architecture at RevenueCat ttypic/swift-klib-plugin on GitHub RevenueCat/purchases-kmp on GitHub Consider moving `Instant` and `Clock` to the standard library · Kotlin/kotlinx-datetime RevenueCat openings Hosts: Sebastian Aigner – Website | Bluesky Márton B...
Feb 20, 2025•52 min•Season 1Ep. 137
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 in...
Jan 23, 2025•53 min•Season 1Ep. 136
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:...
Dec 09, 2024•1 hr 5 min
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...
Nov 21, 2024•46 min•Ep. 134
In this episode, we talk about the future of Kotlin and its development after the 2.0 version.
Aug 29, 2024•1 hr 7 min
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...
Jul 03, 2024•49 min
Join us for an in-depth conversation with Michael Rittmeister and Luca Kellermann, the brains behind Kord, a Kotlin library designed for interacting with the Discord API. In this episode, we dive into the complexities of the Discord API, the importance of WebSockets, and the challenges and strategies in building and maintaining a modularized library. We also explore the future of Kord, including their move towards native support and the ongoing effort to keep up with Discord's evolving features....
Jun 12, 2024•47 min
🚀 Dive into the Compose multiverse with the latest episode of Talking Kotlin! 🌐 In this insightful conversation, our hosts, Seb and Hadi, bring on a special guest, Adriel Café, to discuss two powerful libraries in the Kotlin ecosystem – Lyricist and Voyager. 🎼 Lyricist: The Missing Piece of Jetpack Compose Adriel shares the journey behind Lyricist, an open-source library designed to simplify UI development with Jetpack Compose. Discover how Lyricist leverages sealed classes to enhance navigat...
Mar 06, 2024•43 min
🚀 Immerse yourself in the world of Kotlin as the latest podcast episode unveils the inner workings of the Kotlin Foundation! 🎙️ Join Sebastian and Hadi and a stellar lineup of guests, including Ksenia Shneyveys, Trisha Gee, Kevin Galligan, Charles Anderson, and Jeffrey van Gogh, as they share exclusive insights into the foundation's mission, projects, and plans for the future. 🌐 Discover the foundation's inception, core objectives, and impactful collaborations between founding members JetBrai...
Feb 13, 2024•44 min
Join us in this exciting episode of Talking Kotlin as we dive into the world of Kotlin Multiplatform with three special guests, Mike Nakhimovich, Yigit Boyar, and Matthew Ramotar, the minds behind the popular library 'Store' — a Kotlin Multiplatform library for building network-resilient applications. We explore the journey of 'Store' from its earlier versions to the recently released Store 5, shedding light on the challenges faced in making the library multiplatform. The conversation touches on...
Dec 14, 2023•56 min
Welcome to another engaging episode of Talking Kotlin! In this edition, we dive into the dynamic world of Android development with Colin White, the creator of the widely acclaimed Coil library. Join us as we discuss the latest developments, insights, and the exciting roadmap for Coil. 🚀 Highlights from this Episode: Learn about Colin's journey in developing the Coil library. Discover the pivotal role Coil plays in simplifying image loading for Android developers. Get an exclusive sneak peek int...
Nov 29, 2023•42 min
Dive into the intricate world of microservices with the latest episode of Talking Kotlin, hosted by Sebastian and Hadi . In this engaging conversation, the hosts are joined by Ivan and David, the masterminds behind HTTP4K, to discuss the nuances of simplicity in software development and the often-misunderstood landscape of microservices. The episode kicks off with a discussion about the deceptive allure of complexity in building software. Ivan and David share insights into their roles as consult...
Nov 14, 2023•51 min
In this episode, we talk to Rick Clephas, one of the Kotlin Foundation Grants Program winners and the creator of KMP-NativeCoroutines and KMM-ViewModel. Rick shares how the KMP-NativeCoroutines library came into existence, how it works, and the challenges he faced during its development. We’ve also discussed Rick’s motivation to apply for the grant and how it helps him allocate more time and resources to the project. And finally, watch this episode to see how we reached the decision to rename th...
Sep 19, 2023•45 min
In this episode, we are talking to engineers from @instaboxglobal who use Compose Multiplatform in Production.
Aug 10, 2023•55 min
In this episode of Talking Kotlin, we are chatting with Sébastien Deleuze about the promising future and the huge potential of Kotlin for WebAssembly in the browser and beyond.
Jun 29, 2023•55 min
Does synthesizing a database sound like magic to you? In this episode of Talking Kotlin, we discuss how Synthesized uses Kotlin together with custom DSLs and OpenAPI to do just that! ––––––––––––––––––––––––––– SYNTHESIZED – https://www.synthesized.io/ Hurdy-Gurdy – https://github.com/CourseOrchestra/hurdy-gurdy KotlinPoet – https://github.com/square/kotlinpoet Swagger Parser – https://github.com/swagger-api/swagger-parser
May 04, 2023•48 min
Welcome to the latest episode of Talking Kotlin! In this edition, we are thrilled to have Amrita, Kieran, and Zac, as we dive into a detailed discussion on Circuit - a simple, lightweight, and extensible framework for building Kotlin applications that’s Compose from the ground up. If you're interested in learning more about Circuit and how it can help streamline your Kotlin development process, be sure to tune in to this episode of Talking Kotlin! Circuit - https://github.com/slackhq/circuit Amr...
Mar 20, 2023•1 hr 4 min
In this episode of talking Kotlin, we are talking to Urs Peter about what will happen to Kotlin Coroutines after the arrival of Project Loom in JVM.
Jan 26, 2023•41 min
What distinguishes a mid-level developer from a senior one, and how do you make the leap? Find out in this episode of Talking Kotlin! Our guest is Marcin Moskala – an experienced developer, trainer, speaker, and author of books on Kotlin. Marcin on Twitter - https://twitter.com/marcinmoskala Marcin's website - https://marcinmoskala.com
Dec 08, 2022•48 min
This time we talked to Sudarshan Muralidhar and Christian Melchior from MongoDB + Realm about their new multiplatform product that is created to ensure the consistency and consolidation of data across devices and your backend. Sudarshan Muralidhar on Twitter - https://twitter.com/sudssm Christian Melchior on Twitter - https://twitter.com/chrmelchior Realm Kotlin SDK Documentation - https://www.mongodb.com/docs/realm/sd... Atlas Sync documentation - https://www.mongodb.com/docs/atlas/ap...
Nov 22, 2022•43 min
This time we are talking to Jake Wharton and Saket Narayan about how Kotlin and Compose are used in CashApp and why “it is time for XML to die!”
Aug 25, 2022•43 min
We chat with Alexey about Kotlin Design Patterns and Best Practices and his recently released book, "Kotlin Design Patterns and Best Practices." Alexey on Twitter – https://twitter.com/alexey_soshin 25% OFF THE BOOK use 25ALEXEY code – https://www.packtpub.com/ KotlinConf'23 – https://kotlinconf.com/
Aug 04, 2022•41 min
We chat with Raul, Simon, and Alejandro to learn how Arrow adds functional paradigms and safety to Kotlin, and how it aims to influence the future of the language.
Jun 28, 2022•58 min
