Senior Kotlin Multiplatform Mobile (KMM) Developer

About the role

EY is seeking a Senior Kotlin Multiplatform Mobile (KMM) Developer to create and maintain a shared codebase that powers both Android and iOS applications. You will collaborate with cross‑functional teams to deliver secure, high‑performance features while championing clean architecture and testability.

Key responsibilities

• Develop and maintain cross‑platform modules using Kotlin Multiplatform Mobile (KMM).
• Implement secure authentication and authorization flows such as OAuth 2.0, OpenID Connect, MFA, and SSO.
• Integrate with identity providers and enforce least‑privilege access and continuous verification.
• Collaborate with security architects to embed Zero Trust principles into mobile client design.
• Ensure secure storage of credentials and tokens using Android Keystore and iOS Keychain.
• Monitor and respond to runtime security signals, including device integrity and jailbreak/root detection.
• Write clean, testable, and efficient Kotlin code for shared and platform‑specific modules.

Required profile

• 4+ years of mobile application development (iOS/Android).
• 2+ years of experience with Kotlin Multiplatform development.
• Strong understanding of Kotlin language features and best practices.
• Experience with Compose Multiplatform and Jetpack Compose.
• Proficiency integrating shared code with Swift/Objective‑C (iOS) and Kotlin/Java (Android).
• Hands‑on experience with unit testing and code quality tools such as SonarQube.
• Knowledge of JSON, REST APIs, and CI/CD pipelines for cross‑platform projects.

Required skills

• Kotlin
• Kotlin Multiplatform Mobile (KMM)
• Jetpack Compose
• Compose Multiplatform
• Swift
• Objective‑C
• OAuth 2.0
• OpenID Connect
• MFA / SSO
• Zero Trust security principles
• Android Keystore
• iOS Keychain
• SonarQube
• JSON
• REST APIs
• CI/CD pipelines