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