Overview

As a Senior Machine Learning Engineer in the Search team, you will design and operate scalable search and recommendation systems to deliver highly relevant content to millions of readers. You’ll work at the intersection of backend engineering, data science, and applied AI, shaping personalization and content understanding in real time. You collaborate with product, data science, and engineering peers to make architecture and model decisions that impact user engagement. This hybrid Barcelona role offers the opportunity to push cutting-edge machine learning in a high-traffic media environment.

Compensaciones / Ventajas

- Comprehensive Healthcare Plans
- 30 days holiday per year
- Remote work possibility up to 3 months/year
- Meal benefit with Pluxee
- Retirement plans with company match
- Well-being resources

Responsabilidades

- Design, build, and operate search systems powering content discovery and engagement
- Develop and improve ML models across the personalization stack from candidate generation to ranking
- Enhance candidate retrieval with embeddings, two-tower architectures, and user/content signals
- Lead experimentation and AB testing to measure impact and iterate on models




- Leverage LLMs for content understanding and feature extraction
- Optimize 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 technical solutions

Requisitos principales

- 2-4 years of experience with ML methods focused on recommender systems, search, ranking, or personalization
- Strong Python production ML experience
- Experience with AB testing/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

- collaboration with cross-functional teams
- data-driven decision making
- strong communication and judgment in architectural decisions
- Python for production ML
- A/B testing and experimentation frameworks
- Cloud platforms (AWS, GCP, Azure)

📌 Senior Machine Learning Engineer, Search (Barcelona)
🏢 Dow Jones
📍 Barcelona