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

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

2025 has become a turning point for the world of corporate development. More and more tech giants and large enterprises are announcing a full or partial transition to Kotlin. This language, created by JetBrains, has ceased to be just an "improved alternative to Java for Android" and has turned into a universal tool for backend, cross-platform mobile development, and even data science.

Why Kotlin?

Experts highlight several key reasons why corporations are choosing Kotlin in 2025:

• Full compatibility with Java. Companies can migrate gradually without rewriting millions of lines of old code — Kotlin runs on top of the JVM and easily integrates with existing Java libraries.
• Safety and conciseness. Null-safety is built into the language at the type system level, which significantly reduces the number of runtime errors. Kotlin code is on average 40% shorter than the equivalent in Java.
• Kotlin Multiplatform (KMP). In 2025, KMP has reached maturity. Now companies can write shared business logic for Android, iOS, web, and desktop in one language, saving up to 60% of development time.
• Support from major corporations. Google has declared Kotlin a priority language for Android, and JetBrains is actively investing in developing the ecosystem for server-side development (Ktor, Exposed).

Who Has Already Switched?

The list of companies that migrated to Kotlin in 2024-2025 is impressive:

• Google — more than 70% of new internal projects are written in Kotlin, including parts of Google Maps and Google Drive.
• Netflix — fully transferred its server-side recommendation system infrastructure to Kotlin, increasing performance by 15%.
• Uber — uses Kotlin for the backend of payment services, noting a 30% reduction in the number of errors.
• Amazon Web Services (AWS) — released an SDK for Kotlin first among non-Java languages, and internal teams actively use it for microservices.
• Sberbank — one of the leaders in digitalization in Russia, migrated its mobile banking platform and part of its high-load backend services to Kotlin.

Impact on the Job Market

The 2025 trend has radically changed the demand for developers. According to HeadHunter, the number of vacancies for Kotlin developers has increased by 250% compared to 2023. The average salary of a Kotlin specialist in large companies has exceeded the salaries of Java developers by 20-25%. At the same time, companies are actively attracting Java programmers by offering paid retraining courses — migration to Kotlin turned out to be easy for those familiar with the JVM ecosystem.

What's Next?

Analysts predict that by the end of 2026, Kotlin will enter the top 5 most popular programming languages in the world. It can already be considered the standard for new corporate projects. If your company hasn't considered a transition yet, now is the time to explore the capabilities of Kotlin Multiplatform and modern frameworks. This language is not just a trend, but a long-term investment in code productivity and stability.

What do you think about Kotlin? Share your migration experience in the comments!