As a Principal Engineer, you will:

• Own mobile platform architecture
  • Define and evolve the architecture of MetaMask Mobile (React Native + native), leaning into performance by tightly integrating with backend services and optimizing app–backend interactions holistically rather than in isolation.
  • 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 design and architecture reviews for critical platform areas.
• 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.
  • Own and continuously improve the mobile SDLC and lifecycle, including CI, testing, and release workflows.
• 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.
  • 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.

Bonus Points

• Experience with crypto / Web3, wallets, fintech, or other security‑sensitive apps.
• Contributions to open‑source in React Native, mobile, performance, or tooling.
• Experience optimizing apps for emerging markets or low‑end devices.
• Background in fully remote, globally distributed teams.