[Hiring] Senior Fullstack Engineer - Identity Platform @Zapier

Role Description

Zapier is hiring a Senior Fullstack Engineer to own the foundation of enterprise authentication infrastructure, drive strategic and architectural direction, and unlock large enterprise deals.

• Design and extend systems for:
  • SAML SSO
  • SCIM provisioning
  • OAuth/OIDC flows
  • Multi-factor authentication
  • Login and sign-up
  • Secure session management
• Ensure reliability, latency, and efficiency in authentication systems.
• Own user session propagation across service boundaries, ensuring consistent and secure authentication context.
• Build enterprise authentication controls and compliance APIs.
• Design platform APIs that are consumed by multiple teams, ensuring backward compatibility and clear documentation.

Qualifications

• Experience building identity systems for enterprise SaaS at scale.
• Hands-on experience with SAML, SCIM, OAuth/OIDC, or JWT in a multi-tenant SaaS environment.
• Ability to work through AI agents in development workflows.
• Experience in building systems that other engineering teams depend on.
• Comfortable across the stack, including backend services in Python and Node.js, and familiarity with React.
• Ability to ship through ambiguity and deliver working software quickly.
• Experience working closely with customers and internal engineering teams.
• Strong ownership of work, communication, and initiative.

Requirements

• Design and maintain authentication and session systems.
• Own user session propagation and JWT validation across a multi-service architecture.
• Build enterprise authentication controls and governance APIs.
• Build and maintain platform libraries for internal teams.
• Ensure reliability, latency, and efficiency of authentication systems.
• Respond to authentication-related incidents and participate in on-call rotation.
• Enable partners to move faster by removing authentication bottlenecks.

Benefits

• Join yearly company retreats that rotate to various cities throughout North America.