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

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

We create and deliver tailored marketing strategies for Expedia Group’s brands, focusing on establishing strong connections and cohesive experiences for travelers and partners. We leverage our functional expertise and creative excellence to build trust and loyalty for our brands through innovative marketing approaches and technology.

In this role, you will:

• 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.
• 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.

Experience and Qualifications:

• 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.
• 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.

Nice To Have:

• PhD in Computer Science, Machine Learning, or a related field.
• 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.

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.

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.