Senior Fullstack Engineer - Zapier - Remote - Global

Zapier is hiring a Senior Fullstack Engineer to own the identity platform foundation, drive strategic and architectural direction, and unlock enterprise deals. Responsibilities include designing and extending authentication systems such as SAML SSO, SCIM provisioning, OAuth/OIDC flows, multi-factor authentication, login, sign-up, and secure sessions for large organizations. The role involves ownership of user session propagation across services, building enterprise authentication controls, and developing platform APIs for internal teams. The candidate should have experience with SAML, SCIM, OAuth/OIDC, JWT, and full-stack development in Python, Node.js, React, Kubernetes, Terraform, and CI/CD pipelines. The role requires proactive problem-solving, ownership, and communication skills, with a focus on security, reliability, and performance. The position is remote, with an application deadline of May 1, 2026.