Sr. Fullstack Engineer, Identity Platform

AI AT ZAPIER At Zapier https://zapier.com/about, we build and use automation every day to make work more efficient, creative, and human. So if you’re using AI tools while applying here - that’s great! We just ask that you use them responsibly and transparently. Check out our guidance on How to Collaborate with AI During Zapier’s Hiring Process https://zapier.com/l/jobs/ai-at-zapier, including how to use AI tools like ChatGPT, Claude, Gemini, or others during our hiring process - and when not to. Job Posted: March 17, 2026 Updated: April 29, 2026 Location: Americas - North, Central and South America Zapier is building the foundational systems that enable users and services to securely interact across our platform. As a Senior Fullstack Engineer on the Identity Platform team, you’ll design and scale the systems that define and enforce access across Zapier — from permissions and policies to OAuth/JWT infrastructure and service-to-service authentication. This is a high-impact platform role: you’ll shape how access is modeled, enforced, and scaled across Zapier, establishing consistent patterns that power secure interactions across a large, distributed system. The systems you build will be used by many teams and services, forming the foundation for how authentication and authorization work across the company. Your work will directly support Zapier’s core product strategy and influen