Large Companies Are Switching to Kotlin: The Main Trend of 2025

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Large Companies Are Switching to Kotlin: The Main Trend of 2025

2025 has become a turning point for the Kotlin ecosystem. While this language was previously associated primarily with Android development, it is now confidently conquering the server side, backend, and even desktop solutions. Leading corporations — from financial giants to tech unicorns — are massively announcing the migration of their key projects to Kotlin. In this article, we break down why Kotlin is becoming the number one language of choice for businesses in 2025.

Why Kotlin? Five Reasons for Corporate Love

According to surveys by JetBrains and GitHub, the number of commercial projects using Kotlin has grown by 60% over the past 12 months. Here are the main factors driving companies to make the switch:

Painless compatibility with Java. Kotlin is fully interoperable with Java. Companies don't need to rewrite millions of lines of legacy code — they can gradually introduce Kotlin into existing projects. This reduces risks and the migration budget.
Null-pointer error safety. One of the main headaches for Java developers is NullPointerException. Kotlin's type system makes null safety part of the syntax, sharply reducing the number of bugs in production.
Performance and conciseness. Kotlin code is on average 30-40% shorter than equivalent Java code. Less code means less time to write, fewer errors, and faster onboarding for new employees.
Multiplatform (KMP). Kotlin Multiplatform allows you to write common business logic once and use it on Android, iOS, web, and desktop. For companies with disparate teams, this is a colossal saving of resources.
Support from JetBrains and Google. Kotlin is not a "one-project language." It is developed by JetBrains, and Google has made it the official language for Android. This guarantees long-term support and development.

Case Studies: Who Has Already Switched in 2025

The trend is not just in the air — it is confirmed by real actions from the giants. Here are a few illustrative examples from 2025:

Netflix — announced the migration of its entire server infrastructure for recommendation algorithms to Kotlin. According to their estimates, performance increased by 25%, and API response time decreased by 18%.
Spotify — migrated the backend for processing playlists and user sessions. Developers noted that the number of bugs related to typing dropped by 40%.
Major banks (e.g., Goldman Sachs and Revolut) — are actively adopting Kotlin for high-load financial transactions. The key factor is code reliability and predictability.
AI startups — use Kotlin for the backend of ML models, as it easily integrates with Python via the JVM and ensures stability.

What Does This Mean for Developers?

If you are still unsure whether to learn Kotlin, 2025 gives a clear answer: yes, you should. Demand for Kotlin developers in the job market has grown by 70% compared to 2023. At the same time, the average salary of a Kotlin specialist is 15-20% higher than that of a Java developer of a similar level.