Software Engineer, Frontend / Full Stack (Identity Platform) at Phantom

Phantom is the modern money app used by tens of millions around the world. Our product combines everything people need to manage, spend, and grow their money in one simple, intuitive experience. Phantom brings all the control and flexibility of crypto-powered finance, without unnecessary complexity, into mainstream consumer finance. By combining industry-leading security with thoughtfully designed tools, Phantom makes powerful financial tools feel approachable and easy to use. This focus on speed, control, and user experience has fueled rapid growth, with a community of 20M+ people, reaching #1 in the Google Play Store finance category, and consistently ranking as a Top 50 app across all categories, alongside some of the most recognizable consumer technology platforms in the world. Role Description Identity Platform is the trust root of Phantom: we own authentication, unlocking, onboarding/key generation, and the signing pipeline that every transaction flows through. This is a business-critical area where bugs can lock users out or put funds at risk. You'll ship TypeScript across browser, Node.js, and mobile runtimes (e.g., Hermes) to keep these foundations fast, secure, and reliable. Responsibilities Own and evolve the signing path for every transaction in Phantom. Build and harden authentication, unlocking, biometrics, and account access flows across web and mobile. Ship passkeys (WebAuthn) and MFA improvements with a strong security/usability balance. Own onboarding and key lifecycle flows: key generation/derivation, seed phrase flows, seedless registration, hardware wallet pairing. Own sensitive key export/import experiences and related safety rails. Write and maintain high-signal, non-flaky tests (unit/integration/e2e) for critical paths; ensure safe rollouts via monitoring and staged releases. Qualifications Must-have 7+ years of experience Strong TypeScript skills; comfortable shipping code across browser, Node.js, and mobile JS runtimes. Proven ability to build high-signal, low-flake test suites for critical systems. Familiarity with auth concepts and common mechanisms (sessions/tokens, MFA/OTP, WebAuthn/passkeys) Strong engineering fundamentals: system design, debugging, and production reliability. Nice-to-have Deeper experience with OAuth2/OIDC, WebAuthn internals, cryptography, or key management systems. Web3/wallet or signing-flow experience. Security- or money-adjacent experience (identity, payments, custody). Rust experience (or strong interest in learning it). Why Work with Us We are a team of experienced builders in the blockchain and crypto industry. Our journey began from users seeking an easy, seamless path to accessing the crypto ecosystem. This passion fueled our exponential growth, allowing us to onboard over 20M+ active users in just over three years; with our user base growing weekly. Our dedication to a secure and seamless user experience has made us the leading wallet on Solana as well as our multi-chain approach enhance