Senior Machine Learning Scientist, Agentic AI & GenAI Systems (Growth Marketing)

About the role

We are seeking a Senior Machine Learning Scientist to join our Growth Marketing team. Our team is redefining how AI-driven, agentic automation meets data-powered marketing. You will architect, build, and ship enterprise-scale GenAI, RAG, and multi-agent systems end-to-end, including frontend, backend, and user interfaces.

Responsibilities

• Architect, build, and ship enterprise-scale GenAI, RAG, and multi-agent systems end-to-end, including frontend, backend, and user interfaces.
• Design hierarchical multi-agent ecosystems with Interactive Generative UIs, dashboards, and safety/observability features (e.g., UI is generated on-the-fly by an agent in response to what the user needs).
• Develop memory architectures: short-term contextual memory, long-term episodic memory, knowledge graph augmentation, and adaptive retrieval systems.
• Lead hands-on implementation of RAG pipelines, vector memory systems, and agent orchestration frameworks (LangChain, LangSmith, AutoGen, OpenAI/Claude Agents SDK, etc) and advanced evaluation platforms leveraging LLM-as-a-Judge, synthetic data generation, and agent trajectory assessment.
• Train, fine-tune, adapt (LoRA/QLoRA/adapters), and distill LLMs, including RLHF/DPO, for production-ready chatbots and GenAI products.
• Build multimodal pipelines integrating vision, audio, text, and structured data, optimizing for scalability and latency.
• Build and deploy large-scale behavioral embedding systems that learn traveler representations from billions of search, booking, web, app, loyalty, and marketing interactions, leveraging distributed representation learning and real-time serving to power personalization, audience targeting, propensity models, and next-best-action recommendations.
• Collaborate with product, and engineering teams to create intuitive, user-friendly interfaces and ensure seamless end-to-end user experiences.
• Mentor engineers and ML scientists, set technical standards, conduct design reviews, and contribute to the organization’s technical maturity.
• Represent the Org externally via open-source contributions, patents, conferences, and publications.

Requirements

• 10+ years in software engineering, ML, and AI systems, with production GenAI deployments.
• Deep expertise in LLM training, adaptation, distillation, RLHF/DPO, and RAG systems.
• Solid foundation in NLP and experience with multimodal AI systems (vision-language models).
• Proven experience building and operating multi-agent AI platforms with observability and safety frameworks (self-hosted orchestration using frameworks such as LangGraph integrated with LLM APIs such as Claude).
• Strong background in distributed GPU training and inference, cloud infrastructure (AWS/Azure), container orchestration, and ML tooling.
• Demonstrated ability to lead end-to-end AI product development and collaborate with product and design teams to ship user-facing features.
• Excellent communication skills, able to present complex architecture and product concepts to executives.

Qualifications

• PhD in Computer Science, Machine Learning, or a related field (nice to have).
• Recognized industry presence through publications, patents, talks, or open-source contributions in LLMs, RAG, or agentic systems.
• Experience integrating multimodal LLM systems (vision, audio, music, structured data).
• Leadership in GenAI safety, evaluation, testing, and monitoring.
• Strong cross-disciplinary fluency in modeling, infrastructure, product, and design.

Pay

The total cash range for this position in Seattle is $173,000.00 to $242,500.00. Employees in this role have the potential to increase their pay up to $277,000.00, which is the top of the range, based on ongoing, demonstrated, and sustained performance in the role.

Benefits and Perks

Expedia 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.

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.