Why You Should Learn Kotlin in 5

Kotlin: The Programming Language to Master in 2025

Hey Dev.to community! Let's talk about Kotlin—a fantastic programming language that's perfect for boosting your career in 2025. It cleverly blends the best of Java with modern features, making it a top choice for developers.

Kotlin: A Deep Dive

Developed by JetBrains and first launched in 2011, Kotlin is a modern, statically-typed language running on the Java Virtual Machine (JVM). Its key strength lies in its complete interoperability with Java. This means seamless integration with existing Java projects, a huge advantage for developers already working within the Java ecosystem.

While initially focused on Android, Kotlin's popularity has exploded. It's now used for backend development, web development, data science, and more. Kotlin Multiplatform allows developers to write code once and deploy it across Android, iOS, web, and desktop—a massive time saver. Google's official endorsement in 2017 further solidified its position as a leading language. In 2025, Kotlin's importance continues to grow. For a deeper dive into Kotlin's history and goals, check out JetBrains' detailed overview.

Effortless Java Integration

Kotlin's seamless interoperability with Java is a game-changer. Integrating Kotlin into existing Java projects is straightforward, avoiding the need for complete rewrites.

• Full Java Interoperability: Kotlin and Java code can call each other effortlessly, enabling a gradual transition to Kotlin.
• Library Sharing: Kotlin fully supports Java libraries, eliminating the need to find Kotlin-specific replacements.
• Conversion Tools: IntelliJ IDEA's Java-to-Kotlin converter simplifies the process of migrating existing Java code.

Kotlin's Versatility: Applications Across the Board

Kotlin's versatility shines across various applications:

• Android Development: Since Google's 2017 endorsement, Kotlin has become the go-to language for Android development, powering apps like Pinterest, Trello, and Uber.
• Backend Development: Frameworks like Ktor and Spring Boot make Kotlin ideal for building scalable server-side applications, used by companies like Amazon and Expedia.
• Web Development: Kotlin/JS enables frontend web development, offering the benefits of a statically-typed language within the JavaScript ecosystem.
• Data Science and Machine Learning: Libraries like KotlinDL and krangl are making Kotlin a strong contender in this field.
• Cross-Platform Development: Kotlin Multiplatform significantly reduces development time by allowing code sharing across multiple platforms, as seen in apps like Netflix and Cash App.
• Command-Line Tools: Kotlin's simplicity and robust standard library make it perfect for creating command-line utilities.

The Kotlin Job Market: High Demand, High Salaries

The 2024 Stack Overflow Developer Survey highlights Kotlin's popularity, particularly in mobile development. Kotlin developers are in high demand, with Talent.com reporting an average annual salary of around $130,813 in the US, ranging from $115,000 for entry-level to over $160,000 for experienced professionals. Major companies like Google, Netflix, Pinterest, and Trello are actively using Kotlin.

Why Learn Kotlin in 2025?

2025 is the perfect time to embrace Kotlin. Its popularity in Android development (over 70% of developers use it) continues to grow. Its Java interoperability simplifies integration into existing projects, and its expanding ecosystem provides developers with excellent tools and frameworks. With its versatility, high demand, and strong community, Kotlin presents a fantastic opportunity for developers to thrive in 2025 and beyond.

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