Machine Learning Engineer, South Yorkshire

Whitehall Resources are looking for a Machine Learning Engineer. This role is hybrid working with 3 days per week onsite in South Yorkshire, and the remainder remote working, for an initial 5-month contract.

***Inside IR35***

Build the knowledge, retrieval, and evaluation layer that allows the AI helpdesk to answer accurately and safely.

• Build and maintain data pipelines for IT knowledge articles, SOPs, ticket history, and troubleshooting content.
• Develop RAG pipelines, embeddings, indexing, and retrieval optimization.
• Improve answer quality using chunking, ranking, filtering, and grounding techniques.
• Create evaluation datasets and automated quality tests for accuracy, hallucination, and task completion.
• Support model selection, tuning, and performance benchmarking.
• Work with engineering teams to improve response quality and reduce failure rates.

• Strong Python and data engineering skills.
• Experience with vector databases, embeddings, and retrieval systems.
• Experience building ETL/data pipelines for structured and unstructured data.
• Understanding of LLM evaluation, experimentation, and model performance metrics.
• Familiarity with SQL, APIs, and cloud data platforms.
• AWS (preferred), GCP exposure.

• Experience with enterprise knowledge systems and ticket datasets.
• Experience with fine-tuning, reranking, or search relevance optimization.