Senior ML/LLM Engineer (API & Fullstack)
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AI Infrastructure
Agentic Frameworks
About the Role
Sopra Steria seeks a senior-level machine learning and LLM engineer combining data science expertise with robust API development and full-stack engineering practices. The role emphasizes end-to-end lifecycle management of ML solutions from conception through production deployment.
Position: Senior ML/LLM Engineer (API & Fullstack) - English Mandatory
Location: Carrer de Casanova, Barcelona, Spain
Type: Full-time, permanent contract
Key Responsibilities:
- Develop and validate statistical and machine learning models in Python
- Engineer classification, regression, and predictive models using industry-standard libraries
- Implement NLP solutions extracting insights from unstructured text
- Build LLM-based systems using GPT-4, Claude 3, Llama 3, and Gemini
- Design RAG systems with vector database integration
- Construct orchestrated LLM workflows using appropriate frameworks
- Create scalable production APIs and integrate solutions into applications
Required Skills & Tech Stack:
Data Science: NumPy, Pandas, Polars, SciPy, Scikit-learn, XGBoost, LightGBM, CatBoost, TensorFlow/Keras, PyTorch
NLP & LLMs: NLTK, spaCy, Hugging Face Transformers, Sentence Transformers, LangChain, LlamaIndex, Haystack
Vector Databases: Pinecone, Weaviate, ChromaDB, FAISS
Competencies: Prompt engineering, fine-tuning (LoRA/QLoRA), RAG architecture design
Benefits:
- 23 days annual leave
- Continuous professional development and certifications
- Life/accident insurance
- Flexible benefits (healthcare, meal vouchers, childcare assistance, mobility)
- Comprehensive onboarding and career development planning
English mandatory.
