Kotlin Multiplatform Engineer (Senior or Staff)

Responsibilities

• Design and build shared KMP modules covering networking, data persistence, business logic, and domain models used across Android, iOS, and wasm targets.
• Ship production-grade Compose Multiplatform UIs that feel native and performant on Android, iOS, and web.
• Build optimized platform-specific targets — leveraging Swift/Obj-C interop for iOS and Kotlin/Wasm for web — to meet the performance and UX bar of each platform.
• Architect clean platform-expect/actual boundaries and maintain Kotlin/Native and Kotlin/JS interop layers.
• Set up and manage Koin Multiplatform for dependency injection across all targets, ensuring clean and testable module graphs.
• Collaborate with platform teams (iOS, Android, web) to align on shared APIs, versioning, and release cadences.
• Drive KMP best practices across the organization — tooling, testing strategies, CI/CD for multiplatform builds.
• Lead development of new AI and media-driven features within the shared codebase.
• Participate in architecture reviews and uphold high standards for shared module design and testability.

Requirements

• 8+ years of software engineering experience with deep, expert-level Kotlin.
• Real-world, production KMP experience: shipped KMP code that real users ran on Android, iOS, and/or wasm.
• Hands-on Compose Multiplatform experience: building shared UI across multiple targets with platform-specific adaptations.
• Experience with Koin Multiplatform for dependency injection across KMP targets in production codebases.
• Solid understanding of Kotlin/Native memory model, freezing, and interop with Obj-C/Swift APIs.
• Experience targeting Kotlin/Wasm and/or Kotlin/JS, including the Compose for Web stack.
• Fluency with multiplatform build tooling: Gradle multiplatform plugin, source sets, target configuration, and CI pipelines.
• Strong grasp of coroutines, Flow, and structured concurrency — understanding how they behave across targets.
• Ability to write readable, maintainable, thoroughly documented, and well-tested shared code.

Nice-to-Haves

• Experience with KMP libraries (Ktor, SQLDelight) in production environments.
• Contributions to the KMP/CMP open-source ecosystem or close familiarity with JetBrains’ roadmap.

Benefits

• Competitive salary and generous company equity
• Medical, dental, and vision insurance – 99.99% of premiums covered by Cantina
• 42 days of paid time off, including: 15 PTO days, 10 sick days, 15 company holidays, 2 floating holidays
• Generous parental leave & fertility support
• 401(k) retirement savings plan
• Lifestyle spending account – $500/month
• Complimentary lunch and snacks for in-office employees
• One Medical membership