Senior Fullstack Engineer, Mortgage Fulfillment AI

About the team You’ll join a close-knit engineering team in Zillow Home Loans Fulfillment who know our loan origination system in depth. Fulfillment covers the mortgage journey from application through funding. Today that work runs through human handoffs, third-party tools, and data spread across many systems. Our mission is to use AI agents to shorten that journey: fewer manual steps, faster condition clearing, and a loan process that keeps itself moving toward funding, bringing in a person only for the decisions that need one. We value thoughtful technical leadership, rigor, and teamwork, and we’re always looking for ways to raise the quality, reliability, and impact of what we build. About the role The Senior Software Development Engineer designs, builds, and operates production-grade agentic AI systems for mortgage Fulfillment. This role focuses on agentic AI, not general feature work, and centers on three areas: agent design and architecture, evaluation (evals) infrastructure, and the core infrastructure that runs agents. You’ll own the architecture of your workstreams from end to end, surface tradeoffs, and drive technical decisions on a problem with no existing playbook. This is an individual contributor role. You will get to Design and build multi-step AI agents that coordinate Fulfillment workflows such as document collection, condition clearing, and closing coordination, without requiring a person to step in at every step. Build evaluation frameworks that measure ag