# Principal Machine Learning Scientist - Search and Personalization

Hiring organization: [Expedia Group](https://career.thegoodapps.co/organizations/expedia-group)

Canonical page: https://career.thegoodapps.co/jobs/c8268991-5378-4a0a-9546-b712085264b2

Listed on Expedia Group's own careers site. Applications go to them directly.

- Seniority: Lead / Staff / Principal
- Salary: 224000 – 338500 USD per year

## Summary

Expedia seeks a principal machine learning researcher to lead the design and optimization of search, recommendations, and generative AI discovery systems that serve millions of travelers. This role is for a deep learning expert ready to architect large-scale production systems, mentor a research team, and push the boundaries of retrieval and personalization in high-impact domains.

_Our summary, not Expedia Group's wording._

## Skills named

A/B Testing, Apache Hadoop, Deep Learning, Embeddings, JAX, Natural Language Processing, Python, PyTorch, Reinforcement Learning, SPARK, TensorFlow

## Required

- PhD or MS in Computer Science, Machine Learning, Statistics, or related field, or equivalent professional experience
- 10+ years of industry experience in machine learning
- Production-grade search, recommendation, or personalization systems built
- Intent understanding techniques and retrieval methods
- Deep learning for recommendations and reinforcement learning
- Python and ML frameworks (TensorFlow, JAX, or PyTorch)
- Large-scale distributed systems and big data technologies (Spark, Hadoop)
- A/B testing and experimentation methodologies
- Work with large-scale real-world data including bias, fairness, and privacy considerations
- Technical communication with both technical and non-technical audiences
- Demonstrated mentorship and technical leadership of research or engineering teams

## Nice to have

- Travel or e-commerce industry experience
- Cloud platforms (AWS, GCP, Azure)
- Publications in top-tier ML conferences or journals
- Open-source ML project contributions
- Personalization systems experience
- Track record moving models from prototype to production with ML engineering teams

Apply on Expedia Group's site: https://expedia.wd108.myworkdayjobs.com/en-US/search/job/Washington---Seattle-Campus/Principal-Machine-Learning-Scientist---Search-and-Recommendations_R-108448-1