Software Engineer, Frontend / Full Stack (Identity Platform)

Phantom is a modern money app that combines various financial tools for users worldwide. They are seeking a Software Engineer for their Identity Platform, responsible for ensuring secure and reliable authentication and transaction processes across web and mobile platforms.

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

Requirements:

• 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
• 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)