Senior Machine Learning Engineer, Personalization

Dow Jones; Cataluña; Híbrido; EUR 90.000 - 130.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Healthcare plans

30 days of holidays/year

Remote work up to 3 months/year

Meal benefit

Pension plan

Insurance plans

Well-being allowance

Family care benefits

Subscription discounts

Employee referral program

Descripción de la vacante

Dow Jones in Barcelona is seeking a Senior Machine Learning Engineer to join the Personalization team, delivering highly relevant, real-time content experiences across our digital products. You will design and deploy scalable indexing, retrieval, and ranking systems for millions of readers.

In this role, you’ll work at the intersection of backend engineering, data, and applied AI, leveraging embeddings, two-tower architectures, and LLMs, while collaborating with product managers and data

Formación

• 3+ years of industry experience in ML, focusing on recommender systems, search, or personalization.
• Strong Python proficiency for production ML systems.
• Experience with A/B testing 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, ML, statistics, or equivalent work experience.

Responsabilidades

• Design, build, and operate personalization systems powering content discovery and engagement.
• Develop ML models across the personalization stack from candidate generation to ranking.
• Use data-driven methods to improve candidate retrieval with embeddings and user signals.
• Drive experimentation and A/B testing to measure 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 practices including testing, observability, and CI/CD.
• Collaborate with product managers, data scientists, and analysts to translate business needs into scalable solutions.

Conocimientos

Python (Production ML)

A/B testing

Cloud platforms

SQL/NoSQL

Recommender/Personalization

Educación

CS/ML/Statistics degree

Herramientas

Docker

CI/CD

Embeddings tooling

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 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.

You Will:

• 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 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:

• 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.

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) or 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 %).
• Comprehensive Insurance Plans
• Well-being Resources (200 USD allowance per quarter, Classpass, etc.)
• Family Care Benefits & Caregiving Support
• Subscription Discounts
• Employee Referral Program