✦ Luna Orbit — AI & Machine Learning

Principal Machine Learning Scientist

at Expedia Group

📍 USA - California - San Jose Hybrid 💰 $242K – $338K USD / year Posted March 13, 2026
Salary $242K – $338K USD / year
Type Not Specified
Experience senior
Exp. Years Not specified
Education Not specified
Category AI & Machine Learning

This role involves developing and optimizing large-scale search and recommendation AI models, including multi-modal retrieval and sequential systems, to enhance travel search experiences.

  • Research and deploy advanced ML solutions
  • Architect multi-modal retrieval frameworks
  • Develop ranking pipelines and embeddings
  • Lead online evaluation efforts
  • Collaborate on scalable model deployment

The environment includes deep learning frameworks like TensorFlow and PyTorch, large-scale data processing, and deployment of AI models for personalized content discovery.

The ideal candidate is a senior machine learning scientist with expertise in developing large-scale search and recommendation models, including multi-modal retrieval and sequential systems. They have strong research backgrounds and experience deploying models in production environments.

Machine LearningDeep LearningNatural Language ProcessingRecommender SystemsModel DeploymentA/B TestingCounterfactual Estimation
Multi-modal RetrievalRanking PipelinesEmbeddingsUser Behavior ModelingSequential Recommendation
PythonTensorFlowPyTorchCloud Platforms
Machine LearningDeep LearningNatural Language ProcessingNLPMulti-modal SearchRecommender SystemsRanking PipelinesEmbeddingsUser-item ModelingSequential Recommender SystemsA/B TestingCounterfactual EstimationModel DeploymentData AnalysisPythonTensorFlowPyTorch
Machine LearningDeep LearningNatural Language ProcessingNLPMulti-modal SearchRecommender SystemsRanking PipelinesEmbeddingsUser-item ModelingSequential Recommender SystemsA/B TestingCounterfactual EstimationModel DeploymentData AnalysisPythonTensorFlowPyTorch
ResearchDesignCollaborationInnovationProblem-solving
Industry Technology / Travel / AI
Job Function Design and implement AI models for search and recommendation systems
Machine LearningDeep LearningNatural Language ProcessingNLPMulti-modal SearchRecommender SystemsRanking PipelinesEmbeddingsUser-item ModelingSequential Recommender SystemsA/B TestingCounterfactual EstimationModel DeploymentData AnalysisPythonTensorFlowPyTorch

Lack of experience with large-scale recommendation systems, No experience with model deployment or online evaluation, Insufficient knowledge of deep learning frameworks

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