Machine Learning Engineer III - Advertising Technology

Expedia • San Jose, WA

3d • $146,000 - $204,500

About The Position

Expedia Group brands power global travel for everyone, everywhere. We design cutting-edge tech to make travel smoother and more memorable, and we create groundbreaking solutions for our partners. Our diverse, vibrant, and welcoming community is essential in driving our success. Why Join Us? To shape the future of travel, people must come first. Guided by our Values and Leadership Agreements, we foster an open culture where everyone belongs, differences are celebrated and know that when one of us wins, we all win. We provide a full benefits package, including exciting travel perks, generous time-off, parental leave, a flexible work model (with some pretty cool offices), and career development resources, all to fuel our employees' passion for travel and ensure a rewarding career journey. We’re building a more open world. Join us. Machine Learning Engineer III 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. We are seeking a Machine Learning Engineer III to join our high-performing Advertising Technology team, where we build and operate large-scale batch and real-time ML systems that power pricing, inventory optimization, ranking, and trust & safety across the ad platform. This role sits at the intersection of machine learning, distributed systems, and MLOps, directly influencing how models are designed, deployed, and operated in production at scale. You will work closely with Software Engineering, Data Science, Product, and Platform teams to translate modeling ideas into reliable, observable, and scalable ML systems, while setting technical direction, raising engineering standards, and mentoring others as the platform and business grow. In this role, you will:

Requirements

• Bachelor’s or Master’s degree in Computer Science, Engineering, Data Science, or a related quantitative field
• 3 years+ of industry experience (or equivalent internships/research) working with machine learning or data-driven systems
• Proficiency in Python and familiarity with ML frameworks such as PyTorch or TensorFlow
• Solid understanding of machine learning fundamentals, including supervised learning, feature engineering, model evaluation, and basic bias/variance tradeoffs
• Experience working with data pipelines and large datasets, using tools such as Spark, SQL, or similar
• Familiarity with software engineering fundamentals, including version control, testing, and basic system design
• Ability to collaborate effectively and communicate technical concepts clearly

Nice To Haves

• Experience contributing to production ML systems, including model training, evaluation, or inference pipelines
• Familiarity with distributed data processing (Spark, Databricks) and cloud environments (AWS preferred)
• Exposure to MLOps concepts, such as model deployment, monitoring, or retraining workflows
• Experience building or experimenting with ranking, prediction, classification, recommendation, or NLP models
• Basic familiarity with real-time or near–real-time ML systems
• Background or interest in ads, marketplaces, e-commerce, or travel platforms

Responsibilities

• ML Infrastructure & Pipelines: Design and implement scalable batch and real-time ML pipelines to support advertising delivery and optimization across channels
• Model Deployment & Integration: Operationalize ML models developed by ML scientists, integrating them with ad delivery, bidding, ranking, and campaign management systems
• Data Engineering: Build and maintain reliable data pipelines to ingest, process, and transform large-scale ad impressions, clicks, and conversion data
• Cross-Functional Collaboration: Partner closely with ads product, engineering, analytics, and business teams to align ML solutions with marketplace and revenue goals
• Advertising at Scale: Enable low-latency inference and real-time decisioning for advertising systems serving millions of users across multiple brands and surfaces
• Tooling & Automation: Develop reusable components, APIs, and orchestration workflows to support experimentation, deployment, and rapid iteration in ad systems
• Monitoring & Optimization: Ensure reliability, scalability, and performance of ML-powered ad systems through robust monitoring, alerting, and continuous optimization

Benefits

• full benefits package, including exciting travel perks, generous time-off, parental leave, a flexible work model (with some pretty cool offices), and career development resources, all to fuel our employees' passion for travel and ensure a rewarding career journey
• medical/dental/vision
• paid time off
• Employee Assistance Program
• wellness & travel reimbursement
• travel discounts
• International Airlines Travel Agent ( IATAN ) membership

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level