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 and drive 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 who you know is qualified - please attach and send your resume to jerme@pixie-services.com, with a good phone number and time to reach out to you for a quick conversation.

Best regards,

Brian Scott