AI / LLM Engineer Salary UK 2025
Last updated: August 2025 • 7 min read • Written by: ClickMasters HR Team • Reviewed by: Reviewed annually
Direct Answer
AI / LLM Engineer salaries range from £45,000 to £1,050–£1,500/day. LLM fine-tuning experience (LoRA, QLoRA, PEFT) commands the highest premium — very few UK engineers have hands-on fine-tuning experience at production scale. RAG architecture at scale (vector databases, chunking strategies, retrieval evaluation) commands 20–40% premium. Regulated sector LLM (FCA Consumer Duty AI, NHS DTAC AI, ICO AI guidance compliance) is a niche commanding very significant premium. Multimodal AI (vision + language) commands growing premium for MedTech and document processing roles.
Market Outlook
AI/LLM Engineers design, build, and deploy large language model applications — combining software engineering with prompt engineering, RAG architecture, fine-tuning, and MLOps. The UK AI engineering market is the fastest-moving and highest-paying segment of the 2025 software labour market.
Salary benchmarks by Seniority
IR35 Tax Position
Day rates assume outside IR35. Inside IR35 contractor day rates in the UK are typically 15–25% higher to compensate for the lack of tax efficiency and additional payroll costs. ClickMasters engineers are directly employed by us, representing **zero IR35 risk** for clients.
Frequently Asked Questions
Everything you need to know about ai llm engineer salary standards.
Approximately £115,000–£170,000 mid-level. London +20–30%.
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