Senior Mobile App Developer

About River River is a design company building multi-utility products. Our flagship product River Indie, #SUVofScooters, is designed to help you get things done. Engineered to be a dependable ally on your road to success. We’re a 1000+ team headquartered in Bengaluru – backed by marquee international investors, with mobility-focused funds linked to Yamaha Motors, Al-Futtaim Automotive Group, Toyota VC, Trucks Venture Capital, Mitsui & Co. Ltd, Marubeni Ventures Inc., Lower carbon Capital, and Maniv Mobility.

Key Responsibilities

• We are looking for a skilled Mobile App Developer with strong hands-on expertise in Kotlin Multiplatform (KMP) to join our engineering team at River. In this role, you will design and build cross-platform mobile experiences that share business logic across Android and iOS while delivering native-quality performance. You will work closely with product, design, and backend teams to ship features that matter to our users.
• Design, develop, and maintain Kotlin Multiplatform (KMP) modules for shared business logic across Android and iOS platforms.
• Build and ship native Android features using Kotlin, Jetpack Compose, and Jetpack libraries.
• Collaborate with iOS engineers to integrate shared KMP modules into Swift/SwiftUI apps.
• Architect scalable, maintainable, and testable mobile codebases following MVVM / MVI / Clean Architecture patterns.
• Write unit tests and integration tests for shared KMP code; ensure high test coverage.
• Participate in code reviews, provide meaningful feedback, and uphold engineering best practices.
• Work with REST APIs, GraphQL, and WebSockets; handle serialization using kotlinx.serialization.
• Optimize app performance — battery, memory, network, and startup time.
• Contribute to CI/CD pipeline improvements for mobile build, test, and release workflows.
• Stay up-to-date with the KMP ecosystem, Kotlin tooling, and mobile industry trends.

Ideal Candidate

• B.E. / B.Tech / M.Tech in Computer Science, Information Technology, or a related field.
• Overall 3 to 5 years of overall mobile development experience, with at least 1 to 2 years directly working with KMP in a production environment (Android-first with KMP mandatory).
• Strong grasp of KMP project structure: shared, androidMain, iosMain source sets, Kotlin Multiplatform (KMP)
• Experience with Ktor (HTTP client), kotlinx.coroutines, kotlinx.serialization, and Koin / Kodein for DI.
• Familiarity with Kotlin/Native interop and expect/actual mechanism.
• Proven ability to ship at least one KMP-based app or module to production.
• Proficiency in Kotlin and the Android SDK.
• Solid experience with Jetpack Compose, ViewModel, LiveData / StateFlow, Navigation Component.
• Understanding of Android lifecycle, background work (WorkManager, Coroutines), and storage.
• Strong command of Kotlin — coroutines, flows, sealed classes, extension functions.
• Hands-on experience with Git, pull request workflows, and agile/scrum processes.
• Ability to read and write iOS/Swift code at a working level for KMP integration.
• Experience with RESTful API integration and handling async data flows.
• Experience with Compose Multiplatform (CMP) for shared UI.
• Familiarity with AOSP or Android platform-level development.
• Exposure to mobile DevOps: Fastlane, GitHub Actions, Firebase App Distribution.
• Knowledge of iOS development (Swift, SwiftUI, CocoaPods / SPM).
• Contributions to open-source Kotlin or KMP projects.