Principal Mobile Engineer, Platform

As a Principal Engineer, you will:

• Own mobile platform architecture
• Define and evolve the architecture of MetaMask Mobile (React Native + native).
• Make key tradeoffs between JS/TS, RN, and native to balance performance, reliability, and iteration speed.
• Design and steward core platform systems (e.g., OTA, analytics foundations, data/persistence, auth, VPN/geolocation primitives).
• Lead high‑impact, cross‑team initiatives.
• Drive large upgrades and migrations (React Native, navigation, foundational libraries).
• Lead structural performance and stability work: startup time, crash rate, ANRs, jank, memory usage, bundle size.
• Break large efforts into incremental, shippable milestones with clear impact.
• Elevate developer experience & automation.
• Improve tooling, local dev ergonomics, build/test pipelines, and release workflows for all mobile engineers.
• Establish clear patterns for navigation, state management, and platform primitives to reduce cognitive load.
• Push towards “push‑button” releases and reduced operational toil via automation.
• Build an AI‑enabled platform.
• Integrate AI/LLMs into workflows to scaffold code, enforce patterns, and improve testing and feedback loops.
• Help define how tickets and platform patterns leverage AI safely and effectively.
• Drive app health & performance culture.
• Define and evolve metrics and dashboards for performance, stability, and efficiency.
• Provide tools and guidance so feature teams can self‑diagnose and own regressions.
• Champion shared accountability for app health across all teams contributing to mobile.
• Multiply impact through leadership.
• Mentor Senior/Staff engineers and influence technical direction across Wallet Platform and MetaMask.
• Lead design and architecture reviews for critical platform areas.
• Help shape hiring and technical culture for a lean, senior, high‑leverage Mobile Platform team.

Would be great if you brought this to the role:

Experience:

• 10+ years building and scaling mobile apps, including ownership of large, production React Native or hybrid mobile platforms.
• Prior Staff/Principal‑level impact: leading complex, cross‑team technical initiatives.

Technical depth:

• Deep expertise with React Native in production: architecture, performance, debugging, bridging.
• Solid experience with native iOS (Swift/SwiftUI) and/or Android (Kotlin/Jetpack), including native modules and performance tuning.
• Strong understanding of mobile CI/CD, release engineering, and OTA systems.

Platform & systems mindset

• Track record building internal platforms, shared libraries, or tooling for other engineers.
• Comfort operating in ambiguity and designing durable, reusable solutions.
• Strong architecture and communication skills; able to align diverse stakeholders.

Leadership & mentorship:

• Proven ability to influence without authority, set technical direction, and raise the engineering bar.
• Experience mentoring senior engineers and shaping technical culture.

AI‑curious / AI‑pragmatic

• Experience or strong interest in using AI/LLMs to improve developer productivity and code quality.

We’re passionate about building a diverse team of humans and as such, if you think you've got what it takes for our chaotic-but-fun, remote-friendly, start-up environment—apply anyway, detailing your relevant transferable skills in your cover letter.

• The salary range for US-based candidates only will be determined throughout the interview process depending on experience and skills.
• US pay range (not including bonus, equity or other benefits) $227,000—$272,000 USD.