ph3Requirements /h3ulli3+ years of industry experience applying machine learning methods, with a strong focus on recommender systems, search, ranking, or personalization /li,liStrong proficiency in Python for production ML systems /li,liExperience with A/B testing and experimentation frameworks to measure model impact /li,liFamiliarity with cloud platforms (AWS, GCP, or Azure) and containerized environments /li,liFamiliarity with SQL and NoSQL databases /li,liDegree in computer science, machine learning, statistics, or equivalent work experience /li /ulh3What the job involves /h3ulliWe are looking for a Senior Machine Learning Engineer to join our Personalization team in Barcelona /li,liYou will design and build systems that deliver highly relevant, personalized experiences across our digital products /li,liThis role sits at the intersection of backend engineering, data, and applied AI—leveraging modern architectures and machine learning techniques to connect users with the most relevant content /li,liYou will play a key role in building scalable indexing, retrieval and ranking systems that serve personalized content to millions of readers in real time /li,liYou will partner closely with product,



data science, and engineering teams, bringing technical depth and sound judgment to architectural decisions, model design, and evaluation methodology /li,liDesign, build, and operate personalization systems and services powering content discovery and user engagement /li,liDevelop and improve ML models across the whole personalization stack, from candidate generation to final ranking /li,liUse data-driven methods to improve candidate retrieval, leveraging embeddings, two-tower architectures, and user/content signals /li,liDrive experimentation and A/B testing to measure impact and iterate on models and features /li,liLeverage LLMs to enhance content understanding and feature extraction /li,liOptimize systems for performance, latency, and scalability across high-traffic environments /li,liContribute to engineering best practices, including testing, observability, and CI/CD /li,liCollaborate with product managers, data scientists, and analysts to translate business needs into scalable technical solutions /li /ul /p #J-18808-Ljbffr

📌 Senior ML Engineer, Personalization & Content Ranking (Barcelona)
🏢 Dow Jones
📍 Barcelona