Kotlin
A concise multiplatform language developed by JetBrains
Kotlin Turns 15: Celebrate the Kotlin Effect
🎉 Kotlin turns 15! 🎉
For 15 years, you’ve helped shape Kotlin into the language it is today. Whether you’ve built apps, contributed to the ecosystem, taught others, or simply chosen Kotlin for your next project – thank you for being part of the journey.
Today, we’re celebrating Kotlin and the people who have made its journey possible. Explore special ways to celebrate Kotlin’s 15th birthday.
Leave a birthday wish for Kotlin
Create a digital birthday postcard with a wish or prediction for Kotlin’s next chapter. You can also upload your own photo to personalize the postcard.
Share your postcard with the Kotlin community and add your message to Kotlin’s 15th birthday celebration.
More ways to celebrate
Explore the Kotlin Effect beyond the code:
- Watch familiar Kotlin ideas come to life.
- Battle friction in a browser game.
- Keep learning with free access to select Kotlin courses on Hyperskill until September 9, 2026.
Thank you for being part of Kotlin’s journey
Fifteen years is an incredible milestone – made possible by everyone who has built with Kotlin, contributed to its ecosystem, shared knowledge, and supported one another along the way.
There are still more ideas to explore, more friction to remove, and many more things to build together.
Happy 15th birthday, Kotlin! 💜
