Senior Kotlin Multiplatform Engineer

Cantina

Kotlin Multiplatform Engineer developing shared codebase for AI-driven applications across platforms. Engaging in collaborative coding practices and ensuring native experiences on all devices.

Posted 5/19/2026full-timeLos Angeles • California • 🇺🇸 United StatesSenior💰 $180,000 - $230,000 per yearWebsite

Tech Stack

Tools & technologies

AndroidGradleiOSJavaScriptKotlinSwift

About the role

Key responsibilities & impact

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

What you’ll need

8+ years of software engineering experience with deep, expert-level Kotlin — you know the language spec, not just the idioms.
Real-world, production KMP experience: you’ve shipped KMP code that real users ran on Android, iOS, and/or wasm — not just toy projects or internal tools.
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.
Bonus: experience with KMP libraries (Ktor, SQLDelight) in production environments.
Bonus: contributions to the KMP/CMP open-source ecosystem or close familiarity with JetBrains’ roadmap.

Benefits

Comp & perks

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 to use however you’d like
Complimentary lunch and snacks for in-office employees
One Medical membership, and more!

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

KotlinKMPCompose MultiplatformKoin MultiplatformKotlin/NativeKotlin/JSGradlecoroutinesFlowSQLDelight

Soft Skills

collaborationleadershipcommunicationproblem-solvingattention to detaildocumentationtestabilityarchitecture reviewbest practicesperformance optimization