Principal Mobile Engineer

Who you are

• ~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
• 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
• It is a requirement of employment in this position that applicants will be required to submit to background checks including but not limited to employment, education and criminal record checks. Further details will be provided to applicants that successfully meet the criteria for the position as determined by the company in its sole discretion. By submitting an application for employment, you are acknowledging and consenting to this requirement

What the job involves

• You’ll get to work on the tools, infrastructure, and apps that scale these platforms to onboard one billion participants and 5 million developers. You’ll be constantly exposed to new concepts, ideas, and frameworks from your peers, and as you work on different projects — challenging you to stay at the top of your game
• You’ll join a network of builders that reaches the edge of our ecosystem. Consensys alumni have moved on to become tech entrepreneurs, CEOs, and team leads at tech companies
• MetaMask’s Wallet Platform organization owns the client platforms for the MetaMask browser extension and mobile apps
• The Mobile Platform team treats MetaMask Mobile as a platform: we enable all feature teams to ship high‑quality experiences faster by providing a secure, stable, high‑performance foundation with excellent developer experience and automated operations
• MetaMask Mobile (iOS & Android) is built primarily on React Native, with native code where it matters. As a Principal Mobile Engineer, you’ll be the most senior hands‑on technical leader focused on mobile: setting architecture, defining standards, and driving cross‑team initiatives that shape the future of our mobile platform and MetaMask app
• You’ll work closely with engineers across MetaMask, not just within Mobile Platform, to ensure our mobile apps performance and stability scale with our users, features, and the broader Web3 ecosystem
• 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 p