Machine Learning Scientist II

11105 Expedia, Inc.; Austin (TX); On-site; USD 112,000 - 157,000; Full time

Benefits offered by this job

Medical coverage

Paid time off

Employee Assistance Program

Wellness and travel reimbursement

Travel discounts

IATAN membership

Job summary

Expedia Group in Austin and Seattle seeks a Machine Learning Scientist II to own projects end-to-end, turning business needs into scalable ML solutions and experiments. You will help build and improve the Marketplace Health Model to identify trust, safety, and marketplace-health risks.

You will partner with product, engineering, operations, trust and safety, and other teams to translate complex challenges into practical, measurable models and insights.

Qualifications

• Graduate degree in a quantitative field with ML coursework or research.
• Experience applying ML models to business or product problems.
• Experience designing and deploying LLM-based solutions.
• Proficient in Python, SQL, and ML libraries.
• Ability to translate ambiguous problems into measurable objectives.
• Strong collaboration with cross-functional teams and clear communication.

Responsibilities

• Own ML projects end to end from business need to deployment and measurement.
• Develop and improve the Marketplace Health Model system for trust and safety.
• Translate marketplace challenges into scalable ML and statistical solutions.
• Partner with product, engineering, operations, trust and safety to deliver solutions.
• Design experiments to assess model performance and business impact.
• Monitor deployed models and communicate findings to both technical and non-technical audiences.
• Identify gaps, resolve blockers, and drive projects independently.

Skills

Machine learning

Python

SQL

LLMs

Statistical modeling

Cross-functional collaboration

Education

Graduate degree in quantitative field

Tools

LLM frameworks

Job description

At Expedia Group, we help travelers explore the world, one journey at a time. As a global travel company powered by passionate people, trusted partnerships, and leading technology, we connect travelers, partners, and advertisers through our consumer brands, B2B network, and travel advertising business. Here, you'll do meaningful work that helps millions of people discover, book, and experience travel with more ease, confidence, and joy. Our five Behaviors-Traveler First, Think Big, Operate with Excellence, Ownership Mindset, and Succeed Together-help foster a supportive environment where people can grow their careers and have the flexibility, benefits, and support to do their best work. Join us and build for travelers everywhere.

Machine Learning Scientists II

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

In this role, you will:

• 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

• Graduate degree in a quantitative field (such as Computer Science, Statistics, Machine Learning, Operations Research, or similar) with focused coursework or research in ML, optimization, or statistical modeling.
• 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

• Graduate degree in Deep Learning, NLP, Transformer, LLM
• 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.

#LI-MC1

The total cash range for this position in Austin is $112,000.00 to $156,500.00. Employees in this role have the potential to increase their pay up to $179,000.00, 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 Seattle is $112,000.00 to $156,500.00. Employees in this role have the potential to increase their pay up to $179,000.00, 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 and perks

• medical, dental, and vision coverage
• paid time off
• an Employee Assistance Program
• wellness and travel reimbursement
• travel discounts
• International Airlines Travel Agent Network (IATAN) membership

Accommodation requests

Expedia Group is committed to providing an inclusive and accessible recruiting experience. If you need an accommodation or adjustment due to a disability during the application or recruiting process, please submit a request at https://expedia.service-now.com/askeg?id=job_accommodation.

About Expedia Group

Expedia Group includes three flagship consumer brands - Expedia, Hotels.com, and Vrbo - along with a leading B2B travel business and travel advertising offerings.

Across our brands and business, we help travelers explore the world with confidence and ease.

Important notice Employment opportunities and job offers at Expedia Group will always come from Expedia Group's Talent Acquisition and hiring teams.

Never share sensitive personal information unless you are confident of the recipient.

Expedia Group does not extend job offers via email or messaging tools to individuals with whom we have not made prior contact.

Our email domain is @expediagroup.com.

The official place to find and apply for roles is https://careers.expediagroup.com/jobs/.

Equal Opportunity Expedia is committed to creating an inclusive work environment with a diverse workforce.

All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, veteran status, or any other characteristic protected by law.

This employer participates in E-Verify.

The employer will provide the Social Security Administration (SSA) and, if necessary, the Department of Homeland Security (DHS) with information from each new employee's I-9 to confirm work authorization.

Expedia Group, Inc. (NASDAQ: EXPE) is the global travel marketplace with one purpose: to help travelers explore the world, one journey at a time.

Expedia Group™ connects travelers, partners, and advertisers through its trusted brands, leading technology, and rich first-party data, delivering predictive, personalized experiences that shape the future of travel.

Expedia Group’s ecosystem includes three flagship consumer brands – Expedia®, Hotels.com®, and Vrbo® – the largest B2B travel business, and a premier advertising network.

Guided by an experienced and passionate global team, Expedia Group helps millions of travelers in more than 70 countries explore the world with confidence and ease.

Employment opportunities and job offers at Expedia Group will always come from Expedia Group’s Talent Acquisition and hiring teams.

Never provide sensitive, personal information to someone unless you’re confident about who they are.

We do not send job offers via email, or any other messaging tools, to individuals we have not had prior contact.

Our email domain is @expediagroup.com.

Our official careers website, where you can to find and apply for job openings, is here.