Staff Fullstack Engineer, User Auth Experience
Core
Designing and building world-class authentication, account security, and session management systems for the Stripe Dashboard and all user/agent interaction surfaces.
Role type
Staff Fullstack Engineer (Security & Auth Platform)
Builds
End-to-end login, registration, session management, risk-scoring frameworks, API key security, and two-party approval flows for humans and AI agents.
Domain
Fintech / Identity & Access Management (IAM) / Security Engineering
Deliverable
production ML models | product features | infrastructure
Required skills
Full-stack development (frontend/backend), technical leadership, cross-org alignment, architectural trade-off analysis, system design for scale and resilience, UX integration for security flows.
Preferred skills
Authentication/Authorization systems (SSO, MFA, passkeys, WebAuthn, OAuth, session management, API key security), risk-based security (anomaly detection, step-up auth, fraud prevention), IAM concepts (RBAC, identity governance, SCIM, delegated auth), programmatic auth primitives for agents/APIs, scalable observable systems.
Technologies
WebAuthn, OAuth, SCIM, MCP (Model Context Protocol), AI agent integration frameworks.
Responsibilities
Own technical architecture for major charter areas, design generalized primitives serving multiple surfaces, drive cross-org technical alignment on shared security infrastructure, make tradeoffs balancing security posture and user friction, mentor engineers, raise bar for design rigor and code quality, shape multi-year roadmap.
Seniority
Staff, hands-on IC with strategic scope and mentorship.
