We’re hiring a Senior AI / LLM Engineer to design and industrialise the core AI capabilities that will power ASOS.
At ASOS, AI is central to how we evolve the customer experience — from product discovery and personalisation through to operational decision-making. You’ll work on systems that operate at real scale, supporting experiences used by millions.
This role sits at the centre of our AI differentiation — focused on solving deep technical problems (models, reasoning systems, orchestration), not just feature delivery. You’ll create reusable, production-grade AI platforms that teams across ASOS can leverage, accelerating how we build and scale intelligent products.
We’re looking for someone who thinks in systems, not features — with strong abstraction capability and a mindset of building once and reusing at scale. You’ll be comfortable operating in ambiguity, working on frontier AI problems, and balancing innovation with the realities of production environments.
If you’re motivated by solving complex challenges and seeing your work adopted across a global platform, this is a high-impact opportunity.
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
/01 Company Description
We're ASOS, the online retailer for fashion lovers all around the world.
We exist to give our customers the confidence to be whoever they want to be, and that goes for our people too. At ASOS, you're free to be your true self without judgement, and channel your creativity into a platform used by millions.
Everyone needs some help showing up as their best self. We're Disability Confident Committed - let our Talent team know if you need any reasonable adjustments throughout the recruitment process
/02 Job Qualifications
Tech stack & platform experience (core):
Strong hands-on experience with the Azure AI ecosystem — including Azure OpenAI, Azure AI Studio, and Azure Machine Learning
Experience building and running production-grade AI systems on cloud infrastructure (APIs, event-driven architectures, scalable compute such as AKS or similar)
Proficiency in Python, with experience working across modern AI frameworks (e.g. Semantic Kernel, LangChain or equivalents)
LLM systems and architecture:
Deep understanding of LLMs and transformer-based models, including embeddings, tokenisation, and context management
Experience designing and optimising LLM-powered systems, including fine-tuning approaches, structured prompting, and model selection trade-offs
Experience building end-to-end RAG pipelines, including retrieval strategies, vector search, and grounding techniques
Agentic systems & orchestration:
Experience designing agent-based systems, including multi-agent patterns, tool usage, and workflow orchestration
Understanding of state, memory, and event-driven pipelines in conversational or decisioning systems
Quality, safety & production readiness:
Experience implementing evaluation frameworks to measure model quality and performance
Strong understanding of AI safety, governance, and guardrails (hallucination mitigation, content safety, explainability)
Experience designing secure, scalable, and cost-efficient systems in production environments
Performance and cost optimisation (caching, batching, model routing)
/03 Additional Info
BeneFITS’
Employee discount (hello ASOS discount!)
Employee sample sales
25 days paid annual leave + an extra celebration day for a special moment
Discretionary bonus scheme
Private medical care scheme
Flexible benefits allowance - which you can choose to take as extra cash, or use towards other benefits
Opportunity for personalised learning and in-the-moment experiences that enable you to thrive and excel in your role
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The Work
Make bold moves with strong backing and serious support.
Tech enables our current success as much as our future growth, that's why our tech stack is seriously impressive. If you've got a great idea, we'll help you run with it. Our people are our greatest asset and we're always looking for new challengers who want to help us grow.
The Potential
Boost your skills and accelerate your ambitions.
If you get a buzz out of learning new things every day, you'll love it here. We give everyone the freedom, time and investment to discover what's possible - and explore where we might go next. How far you want to take your career is up to you.
The Culture
Feel encouraged, empowered and heard as part of our expert team.
Join us and you'll be part of a supportive, fun and friendly team of progressive thinkers, listeners and doers – all working together to solve some of the most exciting and complex tech challenges.
The Prospects
Harness extraordinary opportunity at pace and at scale.
We're just getting started with our global ambitions. Our tech team are at the heart of it all, seizing opportunities and making disruptive breakthroughs that have a real business impact in an industry leading way. We already know who we want to become. Do you?
Team Culture
As A Team We Never Sit Still
We always have to move fast. And we rise to the challenges that come with being such a fast-growing business. After all, we wouldn’t be where we are today if we did things the same as everyone else.
Our Tech Training @ ASOS
Whatever experience you have, there’s always a chance to grow and develop your skills further at ASOS.
What’s It Like To Be An Engineer @ ASOS?
From our great opportunities to even greater teams, find out why becoming an engineer at ASOS could be your perfect career move.
what our people say
what our people say
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Zijiao Li
Tech @ASOS
I love working at ASOS in my team because of the great atmosphere. From day one I already felt like being part of the team, everyone is so friendly, approachable and willing to help. It’s the place where you feel trusted and are given the opportunities & time to explore your full potential. As someone who just relocated to London, I also appreciate the international and cultural diverse environment – it’s ok to be whoever you want to be!
Amy Richardson
Tech @ASOS
As a software engineer with a love for fashion, I feel extremely lucky to be part of a fashion company that priorities technology, innovation and customer experience to the same degree as their clothing.
Si Jobling
Tech @ASOS
As someone who left ASOS after 7 years but came back, it speaks volumes how much I love working at ASOS. The obvious reason is the people, not just in Tech but beyond. There's an unspoken respect and authenticity between everyone who works here
Zijiao Li
Tech @ASOS
I love working at ASOS in my team because of the great atmosphere. From day one I already felt like being part of the team, everyone is so friendly, approachable and willing to help. It’s the place where you feel trusted and are given the opportunities & time to explore your full potential. As someone who just relocated to London, I also appreciate the international and cultural diverse environment – it’s ok to be whoever you want to be!
Amy Richardson
Tech @ASOS
As a software engineer with a love for fashion, I feel extremely lucky to be part of a fashion company that priorities technology, innovation and customer experience to the same degree as their clothing.
Si Jobling
Tech @ASOS
As someone who left ASOS after 7 years but came back, it speaks volumes how much I love working at ASOS. The obvious reason is the people, not just in Tech but beyond. There's an unspoken respect and authenticity between everyone who works here
Zijiao Li
Tech @ASOS
I love working at ASOS in my team because of the great atmosphere. From day one I already felt like being part of the team, everyone is so friendly, approachable and willing to help. It’s the place where you feel trusted and are given the opportunities & time to explore your full potential. As someone who just relocated to London, I also appreciate the international and cultural diverse environment – it’s ok to be whoever you want to be!
Amy Richardson
Tech @ASOS
As a software engineer with a love for fashion, I feel extremely lucky to be part of a fashion company that priorities technology, innovation and customer experience to the same degree as their clothing.
Si Jobling
Tech @ASOS
As someone who left ASOS after 7 years but came back, it speaks volumes how much I love working at ASOS. The obvious reason is the people, not just in Tech but beyond. There's an unspoken respect and authenticity between everyone who works here
what our people say
what our people say
what our people say
what our people say
what our people say
what our people say
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what our people say
what our people say
what our people say
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EXTRAS
Benefits
We’re big on rewarding our ASOSers from day one. Benefits are great when you can flex them! That’s why we offer a wide choice of benefits focused on health, wealth, and your inner self – so you can personalise your reward package in a way that’s best for you. Here’s a taster of what you can get.
Employee Discount
The most asked-about benefit! As an ASOSer, you’ll receive an exclusive employee discount. You can also nominate a family member or friend to share your discount with.
Pension
Retirement might not be on your mind right now, but it’s important to prep for it. We offer matched contributions up to 5% to help you save.
Private Medical Care scheme
If you join our Private Medical Care scheme, you’ll get fast and effective access to medical cover.
Bonus
What we achieve is always a team effort. That’s why we offer a discretionary bonus scheme which rewards you based on our group financial and strategic performance.
Celebratory Day!
Get an extra day off in addition to the 25 days of annual leave you get! Spend it celebrating the big days in life, whether it’s birthdays, cultural holidays, weddings and anything else.
Shuttlebus Service (if you're based in our Leavesden office)
It’s more of a work perk, but we offer a free shuttlebus between Watford station and our office in Leavesden.
Sample Sales
We’ve always got fun things happening in our offices, but the one ASOSers get most excited about is our sample sales. Plus, all proceeds from the sample sale get donated to the ASOS Foundation, which helps our charity partners abroad.
Career Development
You’ll have the opportunity for personalised learning and in-the-moment experiences to create a dynamic and agile learning environment that empowers you to thrive and excel in your role.
Summer Hours
We finish at 3pm on Fridays in June, July and August!! This perk doesn’t mean a dip in your salary – it just gives you extra freedom to enjoy those summer weekends however you want.
Location
Our HQ in London
Our HQ in Camden was once a cigarette factory – now, the iconic Art Deco building has been completely renovated with spacious office areas, ASOS Studios (where we shoot all our products), beauty rooms and a free gym. There’s also a subsidised canteen and café.