Senior Data Scientist - Applied AI (Hybrid, 50% Remote)

Bertelsmann; Barcelona; Hybrid; EUR 70,000 - 110,000; Full time

Benefits offered by this job

50% remote working model

City centre offices

Reduced hours on Fridays and holidays

Company mobile phone

e-book and audiobook app access

More annual leave

Product discounts

Job summary

Penguin Random House Grupo Editorial, S.A.U. in Barcelona is seeking aSenior Data Scientist – Applied AI to lead end-to-end data science and AI projects.

You will develop NLP and generative AI solutions, build production-grade Python services and data pipelines, and collaborate with global teams to adopt scalable, responsible AI practices. You’ll work across ML, NLP and generative AI, evaluating approaches, ensuring reliability, and shaping technologies used across the business.

Qualifications

• 5+ years of professional experience in data science, ML, applied AI or related technical discipline.
• Advanced Python skills and the software engineering practices needed to build maintainable production code.
• Strong foundations in ML and data science, including model development, experimentation and evaluation.
• Practical experience building with large language models and generative AI.
• Understanding of modern LLM application patterns, including prompting, structured outputs, embeddings, retrieval/RAG and tool or function calling.
• Experience designing robust approaches to model evaluation and interpreting results critically.
• Strong SQL and experience working with substantial datasets.
• Experience with cloud environments and modern data platforms.
• Experience building or integrating APIs, services or data pipelines.
• Ability to move between experimentation and engineering to deploy production solutions.
• Strong problem-solving skills and the confidence to make technical decisions when the path isn’t obvious.
• Ability to communicate clearly with both technical and non-technical colleagues.
• High level of professional English; collaboration with international teams.

Responsibilities

• Lead data science and applied AI work from exploration and experimentation through to production.
• Develop and evaluate machine learning, NLP and generative AI solutions, selecting the approach that best fits the problem.
• Build applications using LLMs and techniques such as structured generation, embeddings, semantic search, retrieval, RAG, tool use and agents.
• Develop production-quality Python services, APIs and data pipelines that integrate models and AI capabilities into real products and workflows.
• Design experiments and evaluation frameworks to compare approaches, measure quality and understand where systems succeed and fail.
• Work with structured and unstructured data at scale using SQL and modern data platforms.
• Collaborate with ML and Infrastructure Engineers on deployment, containerization, monitoring and production operations.
• Work directly with colleagues across the business to turn open-ended questions into practical technical solutions.
• Support other Data Scientists and contribute to shared technical standards, reusable components and best practices.
• Collaborate with Data Science & AI colleagues globally, while staying current with developments in ML/AI and identifying new approaches worth adopting.

Skills

Advanced Python

LLMs

NLP

SQL

Cloud platforms

APIs

Data pipelines

Communication

English

ML fundamentals

Tools

Docker

Kubernetes

AWS

Snowflake

Databricks

FastAPI

LangChain

Job description

Penguin Random House Grupo Editorial, S.A.U. in Barcelona is seeking aSenior Data Scientist – Applied AI to lead end-to-end data science and AI projects.

You will develop NLP and generative AI solutions, build production-grade Python services and data pipelines, and collaborate with global teams to adopt scalable, responsible AI practices. You’ll work across ML, NLP and generative AI, evaluating approaches, ensuring reliability, and shaping technologies used across the business.