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Talking Kotlin

Talking Kotlin

By: Talking Kotlin
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Summary

 A bimonthly podcast that covers the Kotlin programming language by JetBrains, as well as related technologies.Talking Kotlin
Episodes
  • Exposed 1.0 and Beyond

    Exposed 1.0 and Beyond
    Apr 29 2026

    The Kotlin ecosystem is full of powerful tools and frameworks — and in this episode of Talking Kotlin, we’re diving deep into Exposed, JetBrains’ Kotlin SQL library, which recently reached its 1.0 release.Sebastian and Márton sit down with Chantal from the Exposed team to explore what Exposed is, where it came from, and how it helps developers work with databases in a Kotlin-first way. From type-safe SQL DSLs and lightweight DAO support to JDBC, R2DBC, Ktor, Spring Boot, migrations, and future KMP plans — this episode covers the past, present, and future of Exposed.You’ll learn:What makes Exposed different from traditional ORMsHow the DSL and DAO APIs work togetherWhy Exposed 1.0 required a major architecture redesignHow R2DBC support enables non-blocking database accessHow Exposed integrates with Ktor and Spring BootWhat’s coming next: migrations, plugins, DAO improvements, and KMP supportThe surprisingly charming origin story behind the Exposed cuttlefish mascotWhether you’re already using Exposed or just looking for a Kotlin-friendly way to work with SQL databases, this episode is packed with practical insights and behind-the-scenes stories from the team building it.Try Exposed Read the docs Join the discussion on Kotlin Slack Report issues or share feedback on YouTrack

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    1 hr and 35 mins
  • How Major Metros Run on KMP

    How Major Metros Run on KMP
    Mar 5 2026

    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 DateTime
    • Ktor (Client & Server)
    • Burst library (archived)
    • Java ME (Micro Edition)
    • Mbed TLS
    • SQLDelight
    • Compose Multiplatform
    • JetBrains AI Assistant & Junie

    Hosts:

    • Sebastian Aigner – Website | Bluesky
    • Márton Braun – Website | Bluesky

    Guest:

    • Paweł Kwieciński

    Timeline:
    (0:00) Introduction
    (1:12) What is Masabi?
    (3:03) How does Kotlin fit into this?
    (6:30) System architecture overview
    (8:33) Embedded SDK and mobile apps
    (10:33) Ticket inspectors and validators
    (13:22) Offline operation
    (16:29) The KMP decision
    (24:42) Evaluating alternatives
    (27:21) Planning the migration
    (33:28) First lines of Kotlin
    (43:45) Translating Java to Kotlin
    (53:22) AI-assisted code translation
    (56:39) Early AI era challenges
    (1:05:01) Testing challenges
    (1:08:22) KMP dependencies
    (1:11:34) Domain-specific dependencies
    (1:16:55) Java ME and C interop
    (1:23:22) Backend-client sharing
    (1:26:59) Current status
    (1:31:48) Future plans: CMP
    (1:36:26) Wrap-up
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    1 hr and 39 mins
  • Kotlin 2.3 Release Special (Audio Exclusive)

    Kotlin 2.3 Release Special (Audio Exclusive)
    Feb 3 2026
    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 2.3KotlinConfGolden Kodee Community AwardsHosts: Sebastian Aigner – Website | Bluesky Márton Braun – Website | Bluesky Timeline:(0:00) Intro(1:13) Nested type aliases (stable)(1:46) Data-flow based exhaustiveness checks (stable)(3:28) Return statements in expression bodies(4:19) Unused return value checker (experimental)(12:57) Explicit backing fields (experimental)(18:51) Context-sensitive resolution (experimental)(20:11) Clock and Instant in the standard library (stable)(21:52) UUID v7 support and better parsing(26:14) Java 25 bytecode(26:36) Faster Native release builds(27:45) Swift Export: enums and varargs(29:08) C and Objective-C library import (beta)(30:49) Apple target support changes(32:15) Fully qualified names in Kotlin/Wasm(34:10) New exception handling for wasmWasi(35:32) Suspend function export to JS(37:51) LongArray export to JS(38:40) Unified companion object access in JS(41:05) @JsStatic inside interfaces(41:43) Default exports in JS(43:45) Compose stacktraces for minified Android apps(45:23) Breaking changes 🐜(46:14) Documentation updates(47:24) KotlinConf, Golden Kodees Awards(48:11) Wrap-up
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    50 mins
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