OverviewIn this role you will design and operate scalable search and personalization systems to deliver highly relevant experiences to millions of readers.

You'll work at the intersection of backend engineering, data, and applied AI within the Search team in Barcelona, shaping content discovery and user engagement.

You'll drive model development, experimentation, and deployment while collaborating with product and data teams to turn business needs into scalable, high-performance solutions.

This is an opportunity to leverage embeddings, two-tower architectures, and LLMs to elevate search quality in a high-traffic environment.

Compensaciones / BeneficiosComprehensive Healthcare Plans

Extra paid Time Off (30 holidays)

Remote work options ( Hybrid Barcelona)

Meal benefit with Pluxee

Pension plan with company match

Well-being resources (Classpass, Spring Health)

ResponsabilidadesDesign, build, and operate search systems powering content discovery and engagement

Develop and improve ML models across the personalization stack from candidate generation to ranking

Improve candidate retrieval using embeddings, two-tower architectures and user/content signals





Drive experimentation and A/B testing to measure impact and iterate

Leverage LLMs to enhance content understanding and feature extraction

Optimize systems for performance, latency, and scalability in 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 solutions

Requisitos principales2-4 years of industry ML experience with focus on recommender, search, ranking, or personalization

Strong proficiency in Python for production ML systems

Experience with A/B testing and experimentation frameworks

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 colaboration with cross-functional teams data-driven decision making strong judgment in architectural decisions

Machine learning for recommender systems / ranking

Python for production ML

A/B testing frameworks

📌 Senior Machine Learning Engineer, Search - Barcelona
🏢 Dow Jones u0026
📍 Barcelona