Senior Full Stack Engineer, Authentication
Core
Build and ship the authentication and identity experiences for 70+ million users, covering login, signup, social auth, account recovery, and multi-factor authentication.
Role type
Senior Full Stack Engineer (Authentication)
Builds
Authentication services, APIs, session/token lifecycle, and observability dashboards for the Linktree platform.
Domain
SaaS / Social Media / Identity & Access Management
Required skills
TypeScript, Node.js, React, GraphQL, PostgreSQL, MySQL, AWS, OAuth 2.0, OIDC, JWT, Session Management, MFA, Feature Flags, Staged Rollouts, AI-assisted development
Preferred skills
Experience on auth/identity/platform teams, Security hardening, SSO implementation, Mentorship
Technologies
TypeScript, Node.js, React, GraphQL, PostgreSQL, MySQL, AWS, OAuth 2.0, OIDC, JWT
Responsibilities
Build and ship login/signup flows and social auth; Own session and token lifecycle services; Partner with Security to harden the auth surface; Extend identity for business accounts and Workspaces; Maintain observability and alerting; Mentor engineers.
Seniority
Senior, hands-on IC
