Machine Learning Scientist III

About the Role

Within the AI & Data organization, the Marketplace Science team develops, optimizes and operationalizes applied science driven marketplace levers that support a healthy, trusted marketplace. The Marketplace Health team builds systems that detect behaviors indicating trust, safety, and marketplace-health risk before they result in larger issues. This work helps protect traveler trust and supports a reliable experience across Expedia Group’s marketplace.

Key Responsibilities

• Own machine learning projects end to end, from understanding the business need and defining the approach through execution, launch, measurement, and iteration.
• Develop and improve the Marketplace Health Model system to identify behaviors associated with trust, safety, and marketplace-health risks.
• Translate complex marketplace challenges into scalable machine learning and statistical modeling solutions.
• Partner closely with product, engineering, operations, trust and safety, and other stakeholders to understand needs and deliver practical solutions.
• Stay highly engaged with business outcomes by identifying opportunities where machine learning can create meaningful, measurable impact.
• Proactively evaluate opportunities based on potential return on investment, customer impact, risk reduction, and implementation feasibility.
• Design experiments and analyses to assess model performance, business outcomes, and marketplace-health improvements.
• Monitor deployed models and recommend enhancements to maintain quality, reliability, and relevance as marketplace behavior evolves.
• Communicate technical findings, recommendations, trade-offs, and project progress clearly to both technical and non-technical audiences.
• Identify gaps, resolve blockers, and advance projects independently while keeping stakeholders aligned.

Experience and Qualifications

• Experience developing, evaluating, and applying machine learning models to complex business or product problems.
• Experience designing, developing, and deploying solutions using large language models (LLMs).
• Experience with Python, SQL, and common machine learning libraries and frameworks.
• Experience translating ambiguous problems into measurable objectives, analytical approaches, and actionable recommendations.
• Experience collaborating with cross-functional stakeholders to deliver machine learning solutions from concept through production.
• Proficient communication skills, with the ability to explain technical concepts and business implications clearly.
• Demonstrated ability to work both collaboratively and autonomously, take initiative, and maintain ownership of deliverables.

Preferred Qualifications

• Experience developing agentic applications or LLM-powered agents.
• Experience with trust and safety, fraud detection, risk modeling, anomaly detection, behavioral modeling, or marketplace optimization.
• Experience working with large-scale, imperfect, or evolving datasets.
• Experience with model monitoring, experimentation, and production machine learning systems.
• Experience balancing customer trust, business value, operational considerations, and model performance.

Pay

The total cash range for this position in Seattle is $137,500.00 to $192,500.00. Employees in this role have the potential to increase their pay up to $220,000.00, which is the top of the range, based on ongoing, demonstrated, and sustained performance in the role. The total cash range for this position in Austin is $137,500.00 to $192,500.00. Employees in this role have the potential to increase their pay up to $220,000.00, which is the top of the range, based on ongoing, demonstrated, and sustained performance in the role. Starting pay for this role will vary based on multiple factors, including location, available budget, and an individual's knowledge, skills, and experience. Pay ranges may be modified in the future.

Benefits

• Medical, dental, and vision coverage
• Paid time off
• Employee Assistance Program
• Wellness and travel reimbursement
• Travel discounts
• International Airlines Travel Agent Network (IATAN) membership