A series on Kotlin development, with a focus on multiplatform applications. https://reneevandervelde.com/publications/index.html#expect-fun en 2025-10-25T00:00:00Z https://reneevandervelde.com/publications/expect-fun/audit-ionspin-kmp-libsodium-094-update.html https://reneevandervelde.com/publications/expect-fun/audit-ionspin-kmp-libsodium-094-update.html Updated security audit of the KMP-Libsodium library 2025-09-22T00:00:00Z https://reneevandervelde.com/publications/expect-fun/kmp-extension-variables.html https://reneevandervelde.com/publications/expect-fun/kmp-extension-variables.html Quick tips for storing state as an extension variable on a class in Kotlin, including Kotlin Multiplatform. 2025-05-12T00:00:00Z https://engineering.block.xyz/blog/how-bitkey-uses-cross-platform-development https://engineering.block.xyz/blog/how-bitkey-uses-cross-platform-development Case study on how Bitkey uses Kotlin Multiplatform and Multiplatform compose to build a cross-platform mobile app. 2024-07-23T00:00:00Z https://reneevandervelde.com/publications/expect-fun/audit-ionspin-kmp-libsodium.html https://reneevandervelde.com/publications/expect-fun/audit-ionspin-kmp-libsodium.html An independent audit of the ionspin kotlin multiplatform libsodium wrapper, verifying the library integrity and security through manual file review. 2023-07-25T00:00:00Z https://reneevandervelde.com/publications/expect-fun/builders-are-for-java.html https://reneevandervelde.com/publications/expect-fun/builders-are-for-java.html An exploration of when and how to use builder classes in Kotlin. 2023-07-10T00:00:00Z https://reneevandervelde.com/publications/expect-fun/values-and-enums.html https://reneevandervelde.com/publications/expect-fun/values-and-enums.html An updated description of how to leverage the best parts of value classes in place of some enums.