Senior AI Engineer – Scalable LLM Platforms on Azure

ASOS; Greater London; On-site; GBP 90,000 - 140,000; Full time

Benefits offered by this job

Employee discount (ASOS)

Sample sales

25 days paid annual leave + extra day

Discretionary bonus scheme

Private medical care

Flexible benefits allowance

Learning opportunities

Job summary

ASOS is hiring a Senior AI / LLM Engineer to design and industrialise core AI capabilities powering the customer experience. You will build reusable, production-grade AI platforms and systems at scale, solving deep technical problems in models, reasoning, and orchestration.

You will work on end-to-end LLM-powered solutions, from RAG and fine-tuning to multi-agent workflows, ensuring safe, cost-efficient production readiness across a global platform.

Qualifications

• Proficiency in Python with experience in modern AI frameworks (e.g. LangChain, Semantic Kernel).
• Deep understanding of LLMs, transformers, embeddings, and context management.
• Strong experience with Azure AI ecosystem (OpenAI, AI Studio, ML) and cloud production systems.

Responsibilities

• Design and build LLM-powered systems (RAG, fine-tuning, tool use, multi-agent orchestration)
• Develop agentic workflows for automation, reasoning, and conversational experiences
• Define patterns for autonomous + human-in-the-loop systems
• Build and scale solutions on the Azure AI stack (Azure OpenAI, AI Studio, Azure ML, Cognitive Services)
• Create reusable infrastructure: Prompt orchestration layers, Vector search and retrieval pipelines & Evaluation and observability frameworks
• Design and implement LLM evaluation frameworks (offline + online)
• Implement AI safety guardrails (hallucination control, filtering, explainability)
• Partner with Trust & Security to embed AI risk controls by design
• Build reusable AI capabilities (e.g. stylist reasoning, product understanding, copilots)
• Enable horizontal reuse across squads - building once, scaling many times
• Optimise systems for performance, cost, and reliability (token-aware design)
• Champion best practice in AI engineering, governance, and platform thinking
• Support a culture of inclusive, responsible AI development

Skills

Python

Tools

Azure OpenAI

Azure AI Studio

Azure Machine Learning

AKS

LangChain

Semantic Kernel

Job description

ASOS is hiring a Senior AI / LLM Engineer to design and industrialise core AI capabilities powering the customer experience. You will build reusable, production-grade AI platforms and systems at scale, solving deep technical problems in models, reasoning, and orchestration.

You will work on end-to-end LLM-powered solutions, from RAG and fine-tuning to multi-agent workflows, ensuring safe, cost-efficient production readiness across a global platform.