NLP Platform Engineer: LLM & Text Analytics Expert

Xantura Limited; Greater London; Hybrid; GBP 60,000 - 95,000; Full time

Job summary

Xantura Limited is seeking a Platform NLP/ML engineer to own the text analytics platform (XTA) that underpins our health, housing, and social care data insights. You will drive end-to-end NLP pipelines, from classical approaches to LLM-based extraction, and shape embedding and retrieval systems across complex corpora.

You will implement robust, auditable outputs, optimize prompts, and orchestrate models while ensuring responsible AI practices.

Qualifications

• Bachelor's or Master's degree in Computer Science, Computational Linguistics, Machine Learning, or a related field, or equivalent practical experience.
• 3+ years of professional experience in an NLP, ML, or AI engineering role.
• Strong programming skills and production experience in Python.
• Evidence of practical experience across LLM utilisation in production, embedding models, and traditional NLP models.

Responsibilities

• Own and evolve the core text analytics pipeline; advance large-scale concept extraction, classification, and information retrieval across complex social and clinical text corpora.
• Design and implement LLM-based processing chains for structured information extraction, leveraging prompt engineering, output parsing, and model orchestration to produce high-quality, auditable outputs at scale.
• Build and manage embedding infrastructure; training, fine-tuning, and serving embedding models, and setting up vector databases for semantic search across client data.
• Develop and maintain classical NLP components where appropriate; train smaller classifiers, entity recognisers, and domain-specific models for efficiency and interpretability.
• Lay groundwork for agentic AI capabilities; contribute to multi-agent orchestration, tool integration, and conversational interfaces over Xantura's services.
• Ensure NLP systems are robust, explainable, and aligned with Responsible AI principles.

Skills

NLP engineering

Python

LLM deployment

Prompt engineering

Vector databases

NLP classification/NER

Education

Bachelor's or Master's in CS/Computational Linguistics/ML

Tools

LangChain

PydanticAI

Qdrant

Weaviate

Milvus

Job description

Xantura Limited is seeking a Platform NLP/ML engineer to own the text analytics platform (XTA) that underpins our health, housing, and social care data insights. You will drive end-to-end NLP pipelines, from classical approaches to LLM-based extraction, and shape embedding and retrieval systems across complex corpora.

You will implement robust, auditable outputs, optimize prompts, and orchestrate models while ensuring responsible AI practices.