Senior Fullstack Engineer Identity Platform

AI at Zapier

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Job Posted

March 17, 2026

Location

Americas - North, Central and South America

About the Role

Zapier's mission is to enable enterprise companies to build and maintain dependable AI workflows at scale. The Identity Platform team builds the golden path that every product team uses to deliver reliable, consistent, and secure experiences to these customers. Authentication, session management, and credential infrastructure are the foundation. Get them right, and every product team ships faster with confidence. We're hiring a Senior Fullstack Engineer to own this foundation, drive the strategic and architectural direction of this layer for years to come, and directly unlock our largest enterprise deals.

What You'll Work On

• Enterprise authentication infrastructure: Design and extend systems for SAML SSO, SCIM provisioning, OAuth/OIDC flows, multi-factor authentication, login, sign-up, and secure session management for large organizations. Focus on reliability, latency, and efficiency to enhance system performance and resilience.
• User session auth across services: Own user session propagation and authentication context consistency across Zapier's multi-service platform (monolith, Node.js, Go microservices). Evolve JWT validation and session tracking for growing service footprints.
• Enterprise authentication controls and compliance: Build and extend APIs for org-level authentication policy enforcement, including forced SSO, domain capture, admin-managed requirements, and credential lifecycle controls. Ensure compliance with SOC 2, GDPR, and audit trail requirements.
• Platform APIs for internal teams: Design, document, and maintain backward-compatible APIs, libraries, and contracts for identity infrastructure. Drive adoption through integration guides and support for internal engineering teams.

Level

This is a Senior Engineer role. Senior engineers at Zapier own outcomes end-to-end within their team and extend impact beyond it. You'll coordinate across ownership boundaries, shape technical direction for adjacent systems, and bring other engineers along with you. We'll be transparent about leveling before you reach the final stages.

About You

• Proven experience building enterprise identity systems at scale for SaaS, with hands-on expertise in SAML, SCIM, OAuth/OIDC, or JWT in multi-tenant environments. Deep understanding of authentication protocols and common security challenges.
• Proficient in leveraging AI agents for daily development, including directing and reviewing agent-written code, understanding model capabilities, mitigating failure modes, and rapidly prototyping concepts. Ability to navigate unfamiliar codebases and ship solutions quickly.
• Platform-thinking mindset with experience building internal systems that others depend on, managing backward compatibility, and maintaining clear API boundaries.
• Fullstack proficiency across backend (Python/Django, Node.js/Fastify) and frontend (React) development, with experience in infrastructure concerns like Kubernetes, Terraform, and CI/CD.
• Comfortable shipping through ambiguity, breaking down complex problems, and using working prototypes to drive alignment and demonstrate value. Views compliance and security as design constraints.
• Customer-centric approach, engaging with both enterprise buyers and internal engineering teams, and collaborating with customer support for troubleshooting.
• Strong ownership of work, communication, and self-improvement. Proactive initiative, effective async communication, and a willingness to admit mistakes and learn.

Key Skills/Competency

• Identity and Access Management (IAM)
• Fullstack Engineering
• SAML, SCIM, OAuth, OIDC
• JWT Validation
• API Design
• Enterprise SaaS
• AI-Assisted Development
• Platform Engineering
• Python, Node.js, React
• Security Best Practices

Things you'll do

• Design and maintain authentication and session systems (SAML, SCIM, OAuth/OIDC, MFA, login, sign-up, 2FA, user provisioning) as Zapier scales to larger and more security-conscious customers
• Own user session propagation and JWT validation across a multi-service architecture spanning Python, Node.js, and Go
• Build enterprise authentication controls and governance APIs: forced SSO, domain capture, credential lifecycle, admin authentication policies
• Build and maintain platform libraries consumed by dozens of internal teams
• Treat reliability, latency, and efficiency of auth systems as non-negotiables; build the monitoring, observability, and audit logging to back that up
• Respond to authentication-related incidents and participate in on-call rotation
• Enable Security, Enterprise Response, and product team partners to move faster by removing auth bottlenecks and proactively surfacing what they need
• Join yearly company retreats that rotate to various cities throughout North America

Application Deadline

The anticipated application window is 30 days from the date job is posted, unless the number of applicants requires it to close sooner or later, or if the position is filled.

Even though we’re an all-remote company, we still need to be thoughtful about where we have Zapiens working. Check out this resource for a list of countries where we currently cannot have Zapiens permanently working.