Senior Fullstack Engineer, Mortgage Fulfillment AI

Zillow · Remote, United States

About the teamYou’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.

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. 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.
This is essential for deploying AI safely in a regulated mortgage environment.
Architect and operate core agent infrastructure, including model serving, prompt pipelines, batching, queueing, and observability, designed for reliability: idempotency, retries, graceful degradation, and structured logging.
Build robust integrations with third-party platforms such as Encompass and DocuTech, working within their constraints and extension points to read state and write actions back reliably.
Collaborate closely with Encompass administrators, Fulfillment operations, and Platform engineering partners to refine requirements, break down work, and deliver iteratively.
Set and advocate for engineering best practices in testing, measurement, observability, and incident response, and mentor other engineers through code reviews and design discussions.
This role has been categorized as a Remote position. “Remote” employees do not have a permanent corporate office workplace and, instead, work from a physical location of their choice, which must be identified to the Company. S. employees may live in any of the 50 United States, with limited exceptions.In addition to a competitive base salary this position is also eligible for equity awards based on factors such as experience, performance and location. Actual amounts will vary depending on experience, performance and location. Bachelor’s degree in Computer Science, Computer Engineering, or a related technical field, or an equivalent combination of education and experience.
~8+ years of professional software engineering experience, including building and operating scalable, reliable services in a modern cloud environment.
~ Proven experience owning an AI or ML system in production from end to end (designing, shipping, measuring, and iterating on it) with accountability for correctness, cost, and reliability.
~ Hands-on experience in at least two of these areas: designing and running eval pipelines (including producing labeled data at scale); operating LLM or ML model serving and orchestrating multi-step AI workflows; building reliable integrations with third-party platforms and external APIs.
~ Strong infrastructure instincts alongside AI fluency. Mortgage experience (rules like TRID and RESPA) isn’t required, but the drive to learn it quickly is.
~ As the most-visited real estate platform in the U.we help people navigate buying, selling, financing and renting with greater ease and confidence. Whether youre working in tech, sales, operations, or design, you’ll be part of a company reshaping an industry and helping more people make home a reality.
How we work is a key part of that transformation. Through Cloud HQ, our strategic approach to distributed work, most employees have the flexibility to work from wherever they’re most productive—enabling us to move fast, stay connected and deliver on our people promise.
No matter where you sit in the organization, your work will help drive innovation, support our customers, and move the industry—and your career—forward, together.
Zillow Group is an equal opportunity employer committed to fostering an inclusive, innovative environment with the best employees. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity or Veteran status. If you have a disability or special need that requires accommodation, please contact your recruiter directly.
Qualified applicants with arrest or conviction records will be considered for employment in accordance with applicable state and local law.
communicate effectively and respectfully with employees, supervisors, and staff to ensure exceptional customer service; and follow all federal, state, and local laws and Company policies. Criminal history may have a direct, adverse, and negative relationship with some of the material job duties of this position. These include the duties and responsibilities listed above, as well as the abilities to adhere to company policies, exercise sound judgment, effectively manage stress and work safely and respectfully with others, exhibit trustworthiness and professionalism, and safeguard business operations and the Company’s reputation.