Senior Fullstack Engineer, Mortgage Fulfillment AI

About the team

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 agent reliability, accuracy, and task completion, and use that signal to improve prompts, models, and fallbacks. 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.

Who you are

• 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. You know agents often fail in production because of timeouts, race conditions, malformed payloads, and retry storms, not only because of the model.
• A bias toward measurement: you define what correct looks like, build the tooling to check it, and use that signal to improve the system.
• Comfort with ambiguity and a track record of going deep in a specialized domain. Mortgage experience (rules like TRID and RESPA) isn’t required, but the drive to learn it quickly is.
• Or an equivalent combination of education and experience.

Get to know us

At Zillow, we’re reimagining how people move—through the real estate market and through their careers. As the most-visited real estate platform in the U.S., we help people navigate buying, selling, financing and renting with greater ease and confidence. Whether you're 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. 

Zillow is honored to be recognized among the best workplaces in the U.S. Zillow was named one of FORTUNE 100 Best Companies to Work For® in 2026, and included onTIME’s America’s Best Companies 2026 list, reflecting our commitment to creating an innovative, inclusive, and engaging culture where employees are empowered to grow.

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.

Los Angeles County applicants: Job duties for this position include: work safely and cooperatively with other employees, supervisors, and staff; adhere to standards of excellence despite stressful conditions; 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. Pursuant to the Los Angeles County Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records.