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.Director, Machine Learning Science - MarketingExpedia Group is looking for a Director of Machine Learning Science to lead the applied science team behind our Marketing organization. This team builds the models and optimization systems that decide how we bid on online advertising platforms and allocate marketing capital across channels and brands. The systems you own will directly shape the efficiency of one of the largest performance marketing programs in travel.You will lead scientists and managers delivering production ML at scale, own the roadmap, and partner closely with Marketing, Product, Engineering, Finance, and Analytics leadership. The role suits a leader who pairs technical depth with a broad business perspective and a record of measurable impact.In this role, you will:Own the strategy, roadmap, and OKRs for the machine learning systems powering MarketingDesign and deliver production-grade ML models and optimization systems that improve bidding, capital allocation, and ROASApply rigorous experimentation and measurement to validate business impactRecruit, develop, and retain applied machine learning scientists and managers, and support their growth in a complex environmentPrioritize the team's investment across platform migration, new capabilities, and model innovationBuild partnerships across Product, Engineering, Finance, Analytics, and Marketing leadership, and align priorities with multiple product teamsNavigate and influence the EG data platform and ML technology stack in line with company goalsContribute to the broader data science and analytics community across EGMinimum Qualifications:Graduate degree in machine learning, computer science, statistics, or a related quantitative field; or equivalent related professional experience. PhD preferred10+ years of relevant professional experience and 5+ years of people management experience, including leading high-performing machine learning teamsTrack record of delivering high-impact machine learning products from concept to production at scaleDepth in supervised and unsupervised learning, statistics, and experimentation, including A/B testing, power analysis, Bayesian methods, and causal inferenceCommand of the ML development lifecycle and MLOps: CI/CD, testing, observability, and reliable releasesPreferred Qualifications:Domain experience in bidding, pricing, elasticity modeling, capital allocation, search, personalization, ranking, or recommendationExposure to deep learning, LLMs, retrieval-based systems, and reinforcement learningProficient programming skills: Python preferred, plus Java or Scala, and SQL or equivalent query languagesHands-on experience with ML and data engineering technologies such as Spark, Databricks, Kubernetes, and GPU computeDiscipline in data and feature engineering (quality, lineage, documentation) and in model design with clear objectives, constraints, and risk guardrailsProficient communication, collaboration, and mentoring, with the ability to tailor complex concepts to technical and executive audiencesThe total cash range for this position in Seattle is $224,000.00 to $313,500.00. Employees in this role have the potential to increase their pay up to $358,500.00, 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 perksExpedia Group offers benefits and perks designed to support employees and their families, including medical, dental, and vision coverage, paid time off, an Employee Assistance Program, wellness and travel reimbursement, travel discounts, and International Airlines Travel Agent Network (IATAN) membership. Learn more about life at Expedia Group at https://careers.expediagroup.com/life.Accommodation requestsExpedia 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 GroupExpedia 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 noticeEmployment 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 OpportunityExpedia 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.