Kotlin Developer
GrowingBuilding native Android applications and JVM backend services in Kotlin
Kotlin Developer Salary
United Kingdom
£45,000 – £85,000
United States
$85,000 – $150,000
Varies by location, sector, and experience. Last updated: 2025.
What Is a Kotlin Developer?
A Kotlin Developer designs and builds software using Kotlin — a statically typed JVM language that has become the primary language for native Android application development and is increasingly adopted for backend server-side development on the JVM and cross-platform mobile development via Kotlin Multiplatform. The role combines deep Kotlin language knowledge with platform-specific expertise — Android SDK and Jetpack libraries for native mobile development, Ktor or Spring Boot for backend services, and Kotlin Multiplatform for shared business logic across iOS and Android.
Kotlin was adopted by Google as the preferred Android development language in 2017 and has since displaced Java as the dominant language for new Android development. Kotlin Developers work across mobile application development studios, enterprise Android platform teams, fintech and banking applications, and backend engineering teams migrating from Java to Kotlin on the JVM. The language's null safety, coroutines-based concurrency model, and expressive syntax produce more concise, safer code than Java with full interoperability with the existing JVM ecosystem — making Kotlin adoption incremental and low-risk for Java-based organisations.
What Does a Kotlin Developer Do?
- Design and develop native Android applications using Kotlin and Jetpack libraries including Jetpack Compose
- Implement Kotlin coroutines and Flow for asynchronous programming, managing concurrency and reactive data streams
- Build and maintain backend services using Kotlin on the JVM with Ktor or Spring Boot
- Develop shared business logic using Kotlin Multiplatform, targeting both Android and iOS from a single codebase
- Write unit, integration, and UI tests using JUnit, MockK, and Espresso or Compose testing APIs
- Integrate with Android platform services including push notifications, background processing, and biometric authentication
Kotlin Developer Skills
Hard Skills
- Kotlin
- Mobile Application Development
- Android SDK
- Object-Oriented Programming
- REST API Design
- Coroutines and Asynchronous Programming
- Dependency Injection
- Unit Testing
- Version Control
- Software Architecture
Soft Skills
- Analytical ThinkingApplying Kotlin's type system to reduce runtime errors
- Engineering DisciplineWriting null-safe, idiomatic Kotlin at production quality
- CollaborationWorking across Android, backend, and cross-platform teams
- Receptiveness to FeedbackIterating through code review on platform-specific patterns
- Attention to DetailPrecision in coroutine scoping and concurrency behaviour
- AdaptabilityShifting across Android, server-side, and Multiplatform context
Kotlin Developer Tools & Software
How to Become a Kotlin Developer
Typical Route
Most entrants hold a bachelor's degree in Computer Science, Software Engineering, or Mathematics. Large public universities — including the University of Washington, Georgia Tech, and the University of Texas at Austin — offer programs with the JVM fundamentals and object-oriented systems coursework that underpin Kotlin development. An ABET-accredited Computer Science program is a reliable signal for employers in Android and backend engineering. A master's degree in Computer Science supports practitioners targeting senior Android or backend Kotlin positions at US product companies.
Alternative Route
The Google Associate Android Developer certification is the most widely recognised entry credential for Android Kotlin roles. JetBrains Academy provides a structured Kotlin learning path used by practitioners transitioning from Java. Udemy hosts widely used Android and Kotlin courses, including those from Philipp Lackner. Bootcamp providers including App Academy and Fullstack Academy cover JVM-based development. A portfolio of published Android applications on Google Play demonstrating Jetpack Compose and clean architecture is the primary entry signal.
A Day in the Life of a Kotlin Developer
Morning
Afternoon
Kotlin Developer Career Path
Junior Android Developer / Junior Kotlin Developer
0–2 yrs
Kotlin Developer
2–4 yrs
Senior Kotlin Developer
4–7 yrs
Lead Kotlin Engineer / Android Platform Lead
7–10 yrs
Principal Engineer / Head of Mobile Engineering
10+ yrs
Kotlin Developer Job Outlook
Kotlin's position as the preferred Android development language is secure and growing, sustained by continued platform investment in Jetpack Compose and Android Studio across the full range of organisations with Android requirements. Kotlin Multiplatform's progression toward stability is expanding demand beyond Android-only contexts by enabling shared business logic across Android and iOS. Backend Kotlin adoption on the JVM is also growing as Java teams recognise its productivity and safety benefits with zero migration risk to existing infrastructure.