Senior Machine Learning Engineer, Search

Dow Jones; Madrid; Híbrido; EUR 60.000 - 90.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Healthcare plans

30 days holiday

Remote work option

Meal benefit with Pluxee

Retirement plan

Life insurance

Well-being stipend

Learning & development

Employee referral program

Descripción de la vacante

Dow Jones is seeking a Senior Machine Learning Engineer for the Search team in Madrid. You will design and deploy ML-powered search and personalization systems, delivering relevant content to millions of readers in real time.

You will collaborate with product, data science, and engineering teams to advance architectural decisions and model evaluation. The role emphasizes production ML, experimentation, and scalable backends, with opportunities to work across data, product, and UX functions in a

Formación

• 2-4 years of industry experience applying machine learning, focused on recommender systems, search, ranking, or personalization.
• Strong proficiency in Python for production ML systems.
• Experience with A/B testing and experimentation frameworks.

Responsabilidades

• Design, build, and operate search systems and services powering content discovery and user engagement.
• Develop and improve ML models across the personalization stack, from candidate generation to ranking.
• Use data-driven methods to improve candidate retrieval with embeddings and content signals.
• Drive experimentation and A/B testing to measure model impact and iterate on models.
• 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.

Conocimientos

Python

A/B testing

Cloud platforms

SQL / NoSQL

Machine learning fundamentals

Recommender systems / ranking

Production ML systems

Educación

Degree in CS / ML / Statistics or equivalent

Herramientas

AWS

GCP

Azure

Descripción del empleo

About the Team

Our Technology team drives the evolution of our Engineering, Data, Product and User Experience functions. With a keen focus on delivering cutting-edge solutions, we shape the digital landscape for our customers, readers and users. From revolutionizing visuals to optimizing tools and harnessing the power of data, mobile, video and social platforms, our team is committed to providing a seamless and immersive experience across all touchpoints. Collaborating closely with our newsrooms and strategic partners, we spearhead the development of groundbreaking products and technologies.

About the Role

We are looking for a Senior Machine Learning Engineer to join our Search 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 search indexing, retrieval and ranking systems that serve 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.

You Will

• Design, build, and operate search 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 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.

You Have

• 2-4 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.

Our Benefits

• Comprehensive Healthcare Plans for you and your family (paid by Dow Jones)
• Extra paid Time Off (30 days of holidays/year)
• Possibility to work remotely for 3 months/year (desplazamiento program) and one week of remote work per quarter
• Meal benefit with Pluxee (171€/month on top of your salary)
• Retirement Plans (Dow Jones will pay 2% of a members Pensionable Salary and match employee contribution up to a maximum of 3 %).
• Live insurance
• Well-being Resources (185€ allowance per quarter, Classpass, Spring Health, etc.)
• Family Care Benefits & Caregiving Support
• Hone and Linkedin learning courses for your further development
• Employee Referral Program

Senior Machine Learning Engineer, Search Madrid, Spain