Senior Data Scientist

PIXIE; Barcelona; A distancia; EUR 60.000 - 90.000; Jornada completa

Descripción de la vacante

A leading tech company is seeking a Senior Data Scientist to design and deploy advanced machine learning systems. The ideal candidate has 5+ years in machine learning, expertise in Python, and experience with LLMs and MLOps. This role is remote, offering an opportunity to lead innovative projects in AI and mentor junior data scientists.

Formación

• 5+ years of experience in machine learning and AI.
• Expert in Python and data science libraries.
• Strong knowledge of regression, classification, and evaluation metrics.
• Hands-on experience with PyTorch or TensorFlow.

Responsabilidades

• Design, build, and deploy advanced ML models.
• Architect deep learning pipelines using PyTorch or TensorFlow.
• Develop LLM-based applications and lead junior data scientists.
• Apply MLOps practices for ML model deployment.

Conocimientos

Machine learning

Python

Deep learning frameworks

MLOps

SQL

Git/GitHub

Herramientas

PyTorch

TensorFlow

Descripción del empleo

We are seeking an experienced Senior Data Scientist to lead the design, development, and deployment of advanced machine learning systems — including LLM-based applications — as part of a high-impact data-driven initiative. This role is ideal for someone with deep technical knowledge, experience with mentoring, and a strong grasp of production-level ML and MLOps practices.

About the Role

Title: Senior Data Scientist

Experience: 5+ years

Location: Spain (Remote)

Employment Type: Full-time (Contractual basis)

Key Responsibilities

• Design, build, and deploy advanced ML models (regression, classification, NLP, etc.)
• Architect and implement deep learning pipelines using PyTorch and/or TensorFlow
• Develop and fine-tune LLM-based applications (e.g., RAG pipelines, prompt engineering, embeddings)
• Lead and mentor junior data scientists, driving code quality and reuse
• Apply MLOps practices: CI/CD for ML, model monitoring, reproducibility
• Write basic SQL queries to support data processing and feature engineering
• Collaborate cross-functionally with product, engineering, and data engineering teams

Requirements

• 5+ years of experience in machine learning and AI
• Expert in Python, data science libraries, and deep learning frameworks
• Strong knowledge of regression, classification, optimization algorithms, and evaluation metrics
• Hands-on experience with PyTorch or TensorFlow (preferably both)
• Proven experience working with LLMs and prompt-based models
• Experience in MLOps and deploying ML models to production
• Basic proficiency in SQL for querying structured data
• Proficient in using Git/GitHub for collaborative development

Good to Have

• Experience building or integrating AI agents using LangChain, AutoGen, or similar tools
• Knowledge or experience with reinforcement learning algorithms
• Ideally bi-lingual: Fluent English and Fluent Spanish

Location: Spain

Start: ASAP

Duration: Initially 6 months with extension

If this job description aligns with you — or someone you know is qualified — please attach and send your resume to [email], with a good phone number and time to reach you for a quick conversation.

Best regards,
Brian Scott