[Hiring] Principal Machine Learning Engineer @Zillow

Role Description

As a Principal Machine Learning Engineer on the Agentic AI team, you will get to:

• Own the architecture of agent memory: what Zillow's assistant remembers about each user across conversations, and how memories are written, retrieved, updated, and retired.
• Lead context engineering for production agents: assembling, prioritizing, and compressing context from conversation history, user memory, tools, and skills so every response is relevant, fast, and cost-efficient.
• Build and orchestrate agents end to end, from prompt and context design to deployment and operation in production.
• Define evaluation frameworks for memory and context quality, offline and online, and use them to drive product and technical decisions.
• Stay on the cutting edge of emerging agentic paradigms, including memory architectures and long-context techniques, and convert them into tangible product innovation.
• Lead complex, multi-team initiatives and communicate technical direction clearly to engineers, partner teams, and leadership.

Qualifications

• A master's degree or above, or equivalent experience, in Computer Science, Electrical Engineering, or a related field.
• 5+ years of experience deploying large-scale ML systems, including at least the most recent year building and shipping LLM-based agents in production.
• Hands-on experience building agents end to end: orchestration, prompt engineering and optimization, and context engineering.
• Experience evaluating agentic systems and using those results to improve them.
• Proven technical leadership: you have influenced technical direction across teams and mentored other engineers.
• Strong communication skills, including presenting to senior leadership.
• Strong programming skills in Python and familiarity with agentic AI frameworks such as LangGraph, Agents SDK, or AutoGen.

Requirements

• Experience designing agent or user memory systems (long-term, episodic, or user-profile memory).
• Experience with dialogue systems that sustain long, multi-session conversations.
• Personalization of AI assistants from conversation history.
• Publications, patents, or open-source contributions related to memory, long-context models, or agents.

Benefits

• Competitive base salary.
• Equity awards based on factors such as experience, performance, and location.
• Flexible remote work options.

Company Description

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.

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 on TIME’s America’s Best Companies 2026 list, reflecting our commitment to creating an innovative, inclusive, and engaging culture where employees are empowered to grow.