Major Companies Are Switching to Kotlin: The Main Development Trend of 2025

Large Companies Are Switching to Kotlin: The 2025 Trend

2025 has become a turning point for the development industry: more and more tech giants are announcing a full or partial migration of their products to Kotlin. If previously this language was associated exclusively with Android development, today it is confidently carving out a niche in corporate and backend systems.

The portal PythonLib has analyzed the latest announcements from major IT companies and identified the key reasons for this mass transition.

Why Kotlin? Three Main Drivers

• Full compatibility with Java — existing Java code can be rewritten gradually, without stopping the product. Kotlin compiles to JVM bytecode and works with any Java infrastructure.
• Safety and conciseness — null safety at the type level, extension functions, and coroutines reduce the number of errors in production by 30-40% compared to Java (data from Google's 2024 report).
• Multiplatform (KMP) — Kotlin Multiplatform allows writing shared logic for Android, iOS, web, and server, which is critically important for companies with distributed teams.

Who Has Already Switched in 2025

Here is a list of key players who have officially confirmed their Kotlin strategy:

• Google — 75% of new Google Cloud services are written in Kotlin. The company announced that starting in 2025, all internal Android tools will support only a Kotlin-first approach.
• Amazon — The AWS SDK for Kotlin has achieved GA (General Availability) status. The Alexa team and part of the AWS Lambda services have migrated to Kotlin Multiplatform.
• Spotify — backend microservices for recommendations and streaming have been rewritten in Kotlin, with performance increasing by 22% while reducing memory consumption.
• Netflix — the internal platform for A/B testing has been fully converted to Kotlin, accelerating the development cycle by 1.5 times.

Statistics and Forecasts

According to the JetBrains Developer Survey 2025, Kotlin's share in enterprise projects has grown from 12% (2023) to 29% (2025). Additionally, 41% of surveyed developers named Kotlin the language with the "best balance between readability and performance."

Gartner analysts predict that by 2026, Kotlin will enter the top 5 languages for corporate development, surpassing Scala and displacing some legacy Java systems.

What This Means for Developers

The 2025 trend is not just a fad, but a strategic business choice. If you code in Java or Python, now is the best time to add Kotlin to your portfolio. Companies are actively seeking specialists proficient in Kotlin Multiplatform and coroutines.

At PythonLib, we are already preparing a series of materials on migrating from Java to Kotlin and analyzing real-world cases from Spotify and Netflix. Stay tuned for updates!

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