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Wasm Jobs in California (NOW HIRING)

Zoo

Senior Software Engineer, Frontend

Los Angeles, CA · Remote

Implement advanced AST/code-mods, CodeMirror enhancements, and deep integration with WebAssembly (Wasm) for performance improvements * Utilize Xstate for state management to maintain app consistency ...

Zoo

Senior Software Engineer, Frontend

Los Angeles, CA · On-site +1

$145K - $195K/yr

Familiarity with WebAssembly (Wasm) and its use in web applications for performance enhancements * Understanding of browser internals across major browsers (Chrome, Firefox, Chromium, Brave, etc ...

Apple

JavaScriptCore Manager

Cupertino, CA · On-site

This organization designs and implements changes to deliver improved security, better performance, and new JS and WASM language features. Weʼre looking for leaders with outstanding problem solving ...

TikTok

Multimedia Arch Senior Frontend Engineer

San Jose, CA · On-site

$143K - $197K/yr

... WASM) to deliver an extreme playback experience. - Architect and develop sophisticated internal platforms and efficiency tools, integrating LLMs, RAG, and Function Calling to create intelligent ...

Vizcom

Senior Product Engineer

San Francisco, CA · On-site

... WASM, GPU pipelines, or 3D scene systems Company : Vizcom is an AI-powered creative tool designed for industrial designers and artists. Founded in 2021, the company is headquartered in San Francisco ...

Hedra

Senior Full-Stack Engineer

San Francisco, CA · On-site

$175K - $275K/yr

Strong familiarity with frameworks / standards / concepts such as WASM, websockets, IndexedDB, promises, generators, and coroutines. * Experience building and scaling cloud-based infrastructure ...

Apple

JavaScriptCore Manager

Cupertino, CA

$267K - $401K/yr

This organization designs and implements changes to deliver improved security, better performance, and new JS and WASM language features. Weʼre looking for leaders with outstanding problem solving ...

Adobe

Firefly Foundry, Creative Architect

San Jose, CA · On-site

$236K/yr

Preferred : • API tooling, low-code connectors, and AWS or Azure deployments a plus. • Familiarity with WASM, WebGPU, or canvas rendering a bonus. Company : Adobe is a software company that ...

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Wasm information

What are Wasm developers?

Wasm developers are professionals who specialize in working with WebAssembly (Wasm), a binary instruction format designed to run code efficiently on the web and other environments. They write, compile, and optimize code—often in languages like C, C++, or Rust—that can be executed in a web browser or other Wasm-compatible platforms. Wasm developers enable high-performance applications such as games, video editing, and data processing to run seamlessly in web environments. Their expertise bridges the gap between traditional software development and modern web technologies.

What are some common challenges developers face when working with WebAssembly (Wasm) and how can they overcome them?

Developers working with WebAssembly often encounter challenges such as debugging limited browser support, optimizing performance, and managing interoperability between Wasm modules and JavaScript. Overcoming these hurdles typically involves utilizing browser developer tools tailored for Wasm, staying updated on evolving browser support, and leveraging established libraries or frameworks that streamline JS-Wasm communication. Collaborating with cross-functional teams, such as front-end developers and DevOps, also helps ensure smooth integration and deployment of Wasm modules in production environments.

What are the key skills and qualifications needed to thrive as a WebAssembly (Wasm) Developer, and why are they important?

To thrive as a WebAssembly (Wasm) Developer, you need strong programming skills in languages like C, C++, or Rust, along with experience in web development technologies such as JavaScript and HTML5. Familiarity with Wasm toolchains, browser developer tools, and frameworks like Emscripten or AssemblyScript is typically required. Excellent problem-solving abilities, attention to detail, and effective communication are valuable soft skills in this role. These skills are crucial for building performant, secure web applications that leverage Wasm's capabilities to enhance user experience and cross-platform compatibility.
What are popular job titles related to Wasm jobs in California? For Wasm jobs in California, the most frequently searched job titles are:
What job categories do people searching Wasm jobs in California look for? The top searched job categories for Wasm jobs in California are:
What cities in California are hiring for Wasm jobs? Cities in California with the most Wasm job openings:
Wasm jobs near you
Infographic showing various Wasm job openings in California as of July 2026, with employment types broken down into 100% Contract. Highlights an 100% In-person job distribution.

Kotlin Multiplatform Engineer (Senior-Staff Levels)

Cantina

Los Angeles, CA • On-site, Remote

$180K - $230K/yr

Full-time

Medical, Dental, Vision, Retirement, PTO

Re-posted 15 days ago

Job description

About Cantina:
Cantina Labs is a social AI company, developing a suite of advanced real-time models that push the boundaries of expression, personality, and realism. We bring characters to life, transforming how people tell stories, connect, and create. We build and power ecosystems. Cantina, our flagship social AI platform, is just the beginning.
If you're excited about the potential AI has to shape human creativity and social interactions, join us in building the future!
About the Role:
As a Kotlin Multiplatform Engineer at Cantina, you'll be the architect of our shared-code strategy - building the foundation that powers our experiences across Android, iOS, and web from a single Kotlin codebase. You'll work at the cutting edge of the KMP ecosystem, shipping production code to real users on multiple platforms, while keeping platform-specific layers feeling truly native.
We're looking for a Kotlin expert who has been in the trenches with KMP - someone who has wrestled with interop edge cases, navigated the wasm target, and shipped Compose Multiplatform UI that feels polished everywhere.
What You'll Do:
  • 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.

What You'll Bring:
  • 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.

Compensation:
The anticipated annual base salary range for this role is between $180,000-$230,000. When determining compensation, a number of factors will be considered, including skills, experience, job scope, location, and competitive compensation market data.
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 to use however you'd like
  • Complimentary lunch and snacks for in-office employees
  • One Medical membership, and more!

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