<ul data-eligibleForWebStory="true"><li>ING has seen significant adoption of Kotlin over the past five years, with major internal frameworks and critical services now fully written in Kotlin.</li><li>The company actively contributes to the Kotlin community, organizing events like the yearly ING Kotlin Summit and creating user groups.</li><li>Internally, ING's codebase shows a strong Kotlin adoption, with over 90k internal repositories and around 8% of them containing Kotlin code.</li><li>A trend analysis reveals Kotlin's upward trajectory, becoming the second most used JVM language within the company.</li><li>Repositories containing Kotlin predominantly consist of Kotlin code, while Scala and Groovy repositories are more hybrid in nature.</li><li>Approximately 11% of internal repositories created in February 2025 are pure Kotlin repositories, indicating the organic growth of the language within ING.</li><li>The data analysis provides insights into Kotlin's increasing presence at ING and highlights the language's appeal to developers.</li></ul>

Kotlin adoption inside ING, 5 years later

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