Senior Data Scientist and AI Engineer (Hybrid, LLM/NLP)

Ddv Mediengruppe; Barcelona; Hybrid; EUR 70,000 - 100,000; Full time

Benefits offered by this job

50% remote working model

Offices located in city centre

Reduced working hours on Fridays and e

Meal vouchers

Company phone

e-book and audiobook app access

Job summary

Penguin Random House Grupo Editorial, based in Barcelona, is seeking a Senior Data Scientist – Applied AI to lead complex AI projects from exploration to production. You will work across ML, NLP and generative AI, choosing approaches to build reliable solutions with Python, LLMs and modern AI techniques.

You will collaborate with ML and Infrastructure Engineers to ensure scalable, maintainable deployments, while upholding responsible AI practices and data privacy considerations.

Qualifications

• 5+ years of professional experience in data science, machine learning, applied AI or a related technical discipline.
• Advanced Python skills and the software engineering practices needed to build maintainable production code.
• Strong foundations in machine learning 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.
• The ability to move comfortably between experimentation and engineering, rather than stopping at a notebook.

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 machine learning and AI.

Skills

Python

Data science

ML/DL

LLMs

SQL

Cloud

APIs

English

Tools

Docker

Kubernetes

FastAPI

LangChain

Job description

Penguin Random House Grupo Editorial, based in Barcelona, is seeking a Senior Data Scientist – Applied AI to lead complex AI projects from exploration to production. You will work across ML, NLP and generative AI, choosing approaches to build reliable solutions with Python, LLMs and modern AI techniques.

You will collaborate with ML and Infrastructure Engineers to ensure scalable, maintainable deployments, while upholding responsible AI practices and data privacy considerations.