Machine Learning Scientist II

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. Our Expedia Product & Technology division builds innovative products, services, and tools to deliver high-quality experiences for travelers, partners, and our employees. A unified, singular technology platform powered by data and machine learning provides secure, differentiated, and personalized experiences for the traveler and our partners that drive loyalty and customer satisfaction.         The Machine Learning Scientist II role sits on the Lodging Search Ranking AI team in the Expedia Product & Technology division of Expedia Group. At the heart of the 3-side marketplace (the traveler, the property owners and the platform), this team develops and optimizes ranking models    with state-of-the-art machine learning /   genAI  techniques to power lodging search and personalized lodging ranking/recommendations for the multiple brands and lines of business in our portfolio.     In this role, your   expertise   and passion for innovation, developing   cutting-edge   technology and implementing industry-leading solutions, will improve the experience of millions of travelers and travel partners each year. This is an applied   scientist   role: your models will be deployed to our production systems, and your results will be measured objectively via A/B testing, directly   impacting   our business results. We collaborate closely with the analytics,   product , and engineering teams.      In this role, you will :   • Develop, implement, and   optimize   machine learning models that power   data ‑ driven   features and products, from problem framing through production deployment and iteration.   • Design and evaluate experiments, offline evaluations, and A/B tests to measure model impact, using statistical rigor to compare alternatives and drive decisions.   • Collaborate with engineers, product managers, and analysts to translate ambiguous business problems into   well ‑ scoped   ML solutions, including data requirements,   modeling   approach, and success metrics.   • Apply strong data   modeling , feature engineering, and model selection skills across multiple domains, ensuring models are robust, explainable, and performant at scale.   • Safely integrate and   operate   AI/ ML ‑ enabled   solutions that improve outcomes, including monitoring model performance, detecting degradation, and driving continuous improvements in production.   • Demonstrate familiarity with   AI ‑ driven   systems, tools, or workflows and applying AI/ML concepts to   real ‑ world   products, contributing reusable methodologies and best practices that can be   leveraged   across teams and problem spaces.   Minimum Qualifications:   • Bachelor’s degree in Computer Science   or a related technical field; or Equivalent related professional experience.   • 2+ years of relevant professional experience.   • Proven ability to own ML solutions for a   well ‑ defined   service or product area, including data exploration, model development, offline and online evaluation, and partnering with engineering for integration.   • Proficiency   in at least one major programming language used for ML (such as Python) and common ML/AI frameworks and tooling for model development, training, and evaluation.   • Solid grounding in core ML concepts (e.g.,   supervised   and unsupervised learning, model generalization, overfitting, evaluation metrics), and experience working with   real ‑ world , noisy datasets.   Preferred Qualifications:   • Advanced degree ( Master’s   or PhD) in a quantitative field with a focus on machine learning, statistics, or AI, with experience applying research ideas to practical,   large ‑ scale   problems.   • Experience designing and operating ML systems at scale, including feature pipelines, model training workflows, and online inference, with attention to latency, reliability, and cost.   • Demonstrated   track record   of leading the   end ‑ to ‑ end   lifecycle of ML solutions within a product or domain, from ideation and prototyping through experimentation, launch, and ongoing optimization.   • Strong background in experimentation and   data ‑ driven   decision making, including designing robust A/B tests, interpreting results, and translating findings into product and model changes.   • Familiarity with   AI ‑ driven   systems, tools, or workflows and applying AI/ML concepts to real world products, including experience with at least one of: recommendation systems, ranking, search, personalization, forecasting, or optimization models.     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, religion, gender, sexual orientation, national origin, disability or age.