Zapier
Senior
Design and scale Zapier's IAM platform: OAuth/JWT, permissions, service-to-service auth
Interview for a Senior Fullstack Engineer role on Zapier's Identity Platform team, owning the systems that model, enforce, and scale access across the company — permissions, OAuth/JWT infrastructure, and service-to-service authentication. Expect deep platform-engineering questions on IAM design (RBAC/ABAC/ReBAC), stable API/versioning discipline, and cross-team influence, since this is a shared platform other teams depend on.
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What this interview tests
- OAuth/JWT infrastructure design: tokens, scopes, signing, key rotation
- Authorization models: RBAC, ABAC, relationship-based access control
- Service-to-service authentication (client credentials, service identity, token propagation)
- Platform engineering discipline: stable APIs, managing breaking changes at scale
- Cross-team influence to unify inconsistent auth patterns
- Enterprise governance requirements for access control
Common question themes
Design an authorization system for permissions, roles, and policies for a multi-tenant SaaS product
How would you roll out a breaking change to a shared auth SDK used by many teams without an outage
Walk through JWT signing, validation, and key rotation in a distributed system
When would you choose RBAC vs ABAC vs relationship-based access control
Describe unifying inconsistent auth patterns across services you didn't originally build
How do you use AI agents in your day-to-day engineering workflow
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