Episodios

  • Creator of Spring: No desire to write Java at All

    Creator of Spring: No desire to write Java at All
    Mar 27 2025

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

    Guest:

    • Rod Johnson – Twitter | LinkedIn

    Timeline:
    (0:00) Intro
    (0:52) The origins of Spring
    (6:40) You need a business model
    (8:21) Consistency is key
    (9:39) Sustainable open source
    (14:22) Parallels with JetBrains and Kotlin
    (15:29) Rod’s journey around the JVM
    (20:48) Shoulders of giants
    (22:34) The newcomer experience
    (24:40) LLMs write great Kotlin
    (30:34) “You can start without great pain”
    (33:32) Extension functions
    (36:15) Too much magic?
    (37:56) Rod’s feature wishlist
    (39:37) Versioning and compatibility
    (41:19) Ecosystems and interop
    (43:34) Kotlin type system evolution
    (46:27) Kotlin with Spring
    (52:24) Learning Spring with Kotlin
    (54:46) Kotlin in 5 years?
    (1:00:39) Rod’s current work
    (1:03:58) Wrap-up
    Más Menos
    1 h y 5 m
  • Building KMP Libraries: The RevenueCat Story

    Building KMP Libraries: The RevenueCat Story
    Feb 20 2025

    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 Braun – Website | Bluesky

    Guest:

    • Joop Korteweg – Twitter

    Timeline:
    (0:00) Intro
    (0:44) What’s RevenueCat
    (4:00) In-app purchases are hard
    (7:22) The multiplatform SDK
    (12:44) The demand for KMP
    (16:30) Hiring and team structure
    (18:42) SDKs for any framework
    (21:27) Building on native SDKs
    (23:45) Improving iOS linking
    (24:54) The SDK is on GitHub
    (26:05) Benefits of building on native
    (28:18) Designing a common API
    (33:21) Add-on modules for SDKs
    (37:30) Instant in the standard library
    (38:04) Returning results from the API
    (39:53) API design decisions
    (44:57) Codegen opportunities
    (45:48) The best things about KMP
    (47:07) KMP improvements wishlist
    (48:28) The KMP journey
    (49:45) Wrap-up
    Más Menos
    52 m
  • Becoming a KMP Expert

    Becoming a KMP Expert
    Jan 23 2025
    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.SKIEKMP libraries:whyoleg/cryptography-kotlinInteresting code to explore:JetBrains/kotlinKotlin/kotlinx-datetimeKotlin/kotlinx-ioKotlin/kotlinx.coroutinesCartesian product by Jake Get an invite!Ecosystem wishlist:wasmJs support in SQLDelightCompose Multiplatform support in MapLibreLearning resources:Kotlin Multiplatform build setup from scratch with Sebastian SellmairKEEP - Kotlin Evolution and Enhancement Process HexFormat proposal and discussion Uuid proposal and discussionMore KMP experts: Kevin Galligan BlueskyTwitter Russell Wolf GitHubTwittermultiplatform-settings Jesse Wilson GitHub Sebastian Sellmair Twitter Salomon Brys TwitterHosts: Sebastian Aigner Website Pamela Hill BlogBlueskyGuests: Jake Wharton Website John O'Reilly WebsiteKMP samples on GitHub Konstantin Tskhovrebov Mastodon Tadeas Kriz MastodonBluesky(0:00) Introductions(1:40) Why be a KMP expert?(9:14) First steps to being an expert(16:38) Respecting each platform(24:04) Libraries for KMP(27:45) Advanced learning resources(38:18) Ecosystem wishlist(43:03) Exercising your KMP skills(48:15) Shoutouts to other experts(51:34) Wrap-up
    Más Menos
    53 m
  • Going from Swift to Kotlin with Skip

    Going from Swift to Kotlin with Skip
    Dec 9 2024
    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 server-side
    (8:35) Skip(.tools)
    (8:56) The target audience
    (9:58) What about Android devs?
    (12:11) The current state
    (14:57) Pricing and components
    (16:43) ⁠Contributing to SkipUI⁠
    (18:55) Reimplementing everything
    (23:07) ⁠The Skip stack⁠
    (26:17) Wrapping JVM types
    (28:27) Writing Kotlin in Swift?!
    (29:56) Tooling support
    (32:02) There’s a Gradle project!
    (34:39) iOS API coverage
    (38:24) Platform differences
    (40:10) Data storage
    (44:31) Building on JVM libraries
    (46:42) JSON problems
    (48:00) Testing the Skip stack
    (51:42) SwiftUI to Compose
    (58:21) IDE experiences
    (1:03:35) Conclusion
    Más Menos
    1 h y 5 m
  • Platform Integrations in Kotlin Multiplatform with Russell Wolf

    Platform Integrations in Kotlin Multiplatform with Russell Wolf
    Nov 21 2024

    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 implementation for Jetpack Compose
    • russhwolf/multiplatform-settings on GitHub
    • Kotlin Multiplatform database libraries
      • Room
      • SQLDelight
    • Dependency injection libraries
      • Koin
      • Kotlin-inject
    • ViewModel for Kotlin Multiplatform

    Hosts:

    • Sebastian Aigner
      • Website
    • Márton Braun
      • Website

    Guest:

    • Russell Wolf
      • GitHub
      • Twitter

    Timestamps 0:00 Intro at home 2:02 Intro at droidcon NYC 4:23 Russell’s talk topic 8:14 Code sharing approaches 12:28 Wrapping native APIs 16:18 Attempted segue 16:35 Designing reusable APIs 18:02 Actual segue 18:14 multiplatform-settings 20:23 Supported platforms 24:05 SharedPreferences challenges 26:20 Observable preferences 29:51 Secure storage 30:55 Windows again 31:36 Library code as reference 33:15 Testable library code 35:05 Initializing a KMP library 38:18 Database libraries 40:55 Dependency injection 44:40 Outro
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    46 m
  • Kotlin After 2.0

    Kotlin After 2.0
    Aug 29 2024
    In this episode, we talk about the future of Kotlin and its development after the 2.0 version.
    Más Menos
    1 h y 7 m
  • Reinventing Ticket Sales with Pretix

    Reinventing Ticket Sales with Pretix
    Jul 3 2024
    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 development. He talks about using Kotlin for various components, including Android apps, desktop applications, server-side logic, and even future plans for integrating with hardware like turnstiles.
    Más Menos
    49 m
  • Kord: Deep Dive into the Discord API

    Kord: Deep Dive into the Discord API
    Jun 12 2024
    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. Whether you're a Kotlin enthusiast or a Discord bot developer, this episode is packed with valuable insights and practical advice. Kord library – https://github.com/kordlib/kord Michael on X – @SchlaumeierTVDE Luca on GitHub – https://github.com/lukellmann
    Más Menos
    47 m
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