Requirements

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- 3+ years of industry experience applying machine learning methods, with a strong focus on recommender systems, search, ranking, or personalization

- Strong proficiency in Python for production ML systems

- Experience with A/B testing and experimentation frameworks to measure model impact

- Familiarity with cloud platforms (AWS, GCP, or Azure) and containerized environments

- Familiarity with SQL and NoSQL databases

- Degree in computer science, machine learning, statistics, or equivalent work experience

What the job involves

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- We are looking for a Senior Machine Learning Engineer to join our Personalization team in Barcelona

- You will design and build systems that deliver highly relevant, personalized experiences across our digital products

- This 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

- You will play a key role in building scalable indexing,



retrieval and ranking systems that serve personalized content to millions of readers in real time

- You will partner closely with product, data science, and engineering teams, bringing technical depth and sound judgment to architectural decisions, model design, and evaluation methodology

- Design, build, and operate personalization systems and services powering content discovery and user engagement

- Develop and improve ML models across the whole personalization stack, from candidate generation to final ranking

- Use data-driven methods to improve candidate retrieval, leveraging embeddings, two-tower xcskxlj architectures, and user/content signals

- Drive experimentation and A/B testing to measure impact and iterate on models and features

- Leverage LLMs to enhance content understanding and feature extraction

- Optimize systems for performance, latency, and scalability across high-traffic environments

- Contribute to engineering best practices, including testing, observability, and CI/CD

- Collaborate with product managers, data scientists, and analysts to translate business needs into scalable technical solutions

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📌 Machine Learning Engineer (Personalization) (Barcelona)
🏢 Dow Jones
📍 Barcelona