We are looking for a Senior Machine Learning Engineer to join Expedia Group’s Machine Learning Engineering team. You will be a senior technical contributor on a team that architects, builds, and operates the infrastructure for deploying ML solutions, managing data pipelines, and optimizing compute resources for our ranking problems, recommendation engines, and pricing optimization systems. Your work will be critical in shaping how our ML models are designed, deployed, and scaled in production environments, and in elevating the engineering capabilities of the team around you.
This is a high-impact role for a deeply experienced ML engineer who brings expertise across software engineering, distributed systems, and machine learning operations (ML Ops). You will take end-to-end ownership of complex ML systems, drive architectural decisions, and partner closely with ML scientists and product stakeholders to deliver production-grade solutions at scale.
This role is well-suited to someone with deep, proven experience in at least two of the following: software engineering, data engineering,



distributed systems, or applied machine learning - with a track record of delivering in production. You are comfortable navigating ambiguity, making technical trade-offs with business context in mind, and driving alignment across teams. You operate with a high degree of autonomy and are expected to set a technical bar for those around you through design, code, and mentorship.
We welcome candidates who are strong, language-agnostic problem solvers and passionate about building robust ML systems, even if you don’t meet every single requirement listed below. If you believe you can do the job and are excited to grow with us, we’d love to hear from you.
In this role, you will:

Architect and own end-to-end ML infrastructure for training, deployment, and serving across batch and real-time environments.
Define and drive technical standards for ML systems, including reliability, observability, an

📌 Senior Machine Learning Engineer (Madrid)
🏢 Expedia
📍 Madrid