Data Scientist Mid Level UK in London

Role type: Full time

Location: UK (Fully remote)

Preferred start date: ASAP

About Satalia

Satalia builds enterprise-grade AI systems for WPP and its FTSE 100 client base. Led by WPP Chief AI Officer Daniel Hulme, we run as a high-autonomy, decentralised organisation where engineers and scientists own their domains end to end. We are building AI systems that operate on terabyte-scale multimodal datasets to power the next generation of marketing intelligence.

The Role

• Agentic pipelines — multi-step LLM systems with tool use, planning, and self-evaluation that automate complex marketing workflows end to end.
• Domain-adapted foundation models — fine-tuning open-weight LLMs (LoRA, RLHF, distillation) on proprietary WPP data for tasks like audience segmentation, creative scoring, and brand-safety classification.
• Retrieval-augmented generation — production RAG systems over large proprietary corpora (embedding models, vector indices, re-ranking) that serve real-time answers to client queries.
• Classical ML at scale — gradient-boosted models, causal inference pipelines, and recommendation engines that run alongside LLM components in hybrid architectures.

You will work as part of an experienced team contributing directly to one or more of these workstreams. You'll have real ownership of your work — building models, running experiments, and shipping code to production — with guidance from senior scientists who will help you grow technically.

What You'll Do

• Build and iterate on ML models — from data exploration and feature engineering through training, evaluation, and deployment.
• Implement and maintain components of production ML pipelines: data pre-processing, model serving, monitoring, and retraining workflows.
• Contribute to LLM-powered systems — building prompt.