Senior Machine Learning Scientist - Agentic Experience

Expedia Group; Seattle (WA); On-site; USD 185,000 - 262,000; Full time

Benefits offered by this job

Medical, dental, and vision coverage

Paid time off

Employee Assistance Program

Wellness and travel reimbursement

Travel discounts

IATAN membership

Job summary

Expedia Group is building agentic AI systems to revolutionize travel assistance. The team designs autonomous agents, integrates LLMs with tools, and develops scalable frameworks that handle planning, tool use, and memory across real-world tasks.

The role emphasizes safety, evaluation, and collaboration with product and research to ship production-ready solutions for millions of travelers and partners.

Qualifications

• 8+ years of related industry experience.
• Experience designing and deploying agentic or multi-step AI systems in production or research settings.
• Strong proficiency in Python and ML frameworks; experience with LLM APIs and orchestration libraries.
• Experience integrating LLMs with external tools, APIs, and structured data sources.
• Solid understanding of prompt engineering techniques including chain-of-thought and few-shot prompting.
• Experience defining and running evaluation frameworks for ML systems, including offline benchmarking and production monitoring.

Responsibilities

• Design, build, and evaluate multi-step agentic AI systems with autonomous agents and tool use.
• Research and implement ReAct, reflection loops, chain-of-thought prompting, and tool-augmented reasoning.
• Develop and maintain agent orchestration frameworks and failure handling.
• Integrate LLMs with external tools, APIs, databases, and code execution environments.
• Define and own evaluation frameworks to measure reliability, latency, cost, and safety.
• Collaborate with product, engineering, and research teams to translate requirements into designs.
• Identify and mitigate risks like prompt injection, hallucination, and unsafe tool use.
• Stay current with agentic AI landscape and synthesize research for direction.
• Mentor junior ML engineers on agentic design patterns and experimentation.

Skills

Agentic AI design

Python

ML frameworks

LLM integration

Prompt engineering

Evaluation frameworks

Production ML

Education

PhD/MS/BS in CS/ML/Engineering

Tools

LangChain

LlamaIndex

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.

Introduction to the Team:

Expedia Technology teams partner with our Product teams to create innovative products, services, and tools to deliver high-quality experiences for travelers, partners, and our employees. A singular technology platform powered by data and machine learning provides secure, differentiated, and personalized experiences that drive loyalty and traveler satisfaction.

The Traveler Discovery & Planning team at Expedia is at the forefront of innovation in AI-driven agentic systems. We're dedicated to enhancing customer experiences, increasing engagement, and strengthening traveler relationships through cutting-edge machine learning solutions. Our work directly impacts millions of travelers worldwide, shaping their journey from dreaming to booking and beyond.

Join a team that’s focused on Agentic Experiences revolutionizing traveler experiences through autonomous, intelligent agent systems. From building cutting‑edge conversational AI that anticipates traveler needs to developing proactive solutions for personalized trip planning, your work will shape the future of travel assistance and directly impact millions of users worldwide. This is a rare opportunity to build foundational systems in a high‑impact domain, backed by Expedia’s AI‑first vision.

In this role, you will:

• Design, build, and evaluate multi‑step agentic AI systems, including autonomous agents capable of planning, tool use, memory management, and multi‑agent collaboration

• Research and implement state‑of‑the‑art techniques in agentic architectures, such as ReAct, reflection loops, chain‑of‑thought prompting, and tool‑augmented reasoning

• Develop and maintain agent orchestration frameworks, defining how agents decompose tasks, delegate to sub‑agents, and handle failure and recovery

• Integrate large language models (LLMs) with external tools, APIs, databases, and code execution environments to enable real‑world task completion

• Define and own evaluation frameworks for agentic systems, measuring task success, reliability, latency, cost, and safety across diverse benchmarks and production scenarios

• Collaborate closely with product, engineering, and research teams to translate business requirements into agentic system designs and deliver production‑grade solutions

• Identify and mitigate risks specific to agentic systems, including prompt injection, unintended actions, hallucination in long‑horizon tasks, and unsafe tool use

• Stay current with the rapidly evolving agentic AI landscape, synthesizing academic research and industry developments to inform the team's technical direction

• Mentor junior ML engineers and scientists, providing technical guidance on agentic design patterns, LLM best practices, and experimentation methodology

Minimum Qualifications:

• 8+ years of related industry experience

• Demonstrated experience designing and deploying agentic or multi‑step AI systems (e.g., ReAct, tool‑calling agents, multi‑agent pipelines) in production or research settings

• Strong proficiency in Python and ML frameworks (PyTorch, TensorFlow, or JAX); experience with LLM APIs and orchestration libraries (e.g., LangChain, LlamaIndex, or similar)

• Experience integrating LLMs with external tools, APIs, and structured data sources for real‑world task completion

• Solid understanding of prompt engineering techniques including chain‑of‑thought, few‑shot prompting, and structured output generation

• Experience defining and running evaluation frameworks for ML systems, including offline benchmarking and production monitoring

Preferred Qualifications:

• PhD, MS, or BS in Computer Science, Machine Learning, Statistics, Engineering, or a related field; or equivalent professional experience

• Experience in the travel or e‑commerce industry

• Publications in top‑tier ML conferences or journals

• Patented Inventions, pending and issued

• Contributions to open‑source ML projects

• Experience taking models from prototype to production in collaboration with Machine Learning Engineering teams

The total cash range for this position in San Jose is $187,000.00 to $261,500.00. Employees in this role have the potential to increase their pay up to $299,000.00, 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 $184,500.00 to $258,000.00. Employees in this role have the potential to increase their pay up to $295,000.00, 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 Austin is $184,500.00 to $258,000.00. Employees in this role have the potential to increase their pay up to $295,000.00, 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

Learn more about life at Expedia Group at https://careers.expediagroup.com/life.

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.