At ASOS, we're building the next generation of AI-powered Search and Discovery experiences for millions of customers worldwide.
Our Search & Recommendations team develops the platforms, infrastructure and machine learning systems that power personalised product discovery, ranking, retrieval and recommendation experiences across ASOS. We operate high-scale production systems that enable data scientists and ML engineers to rapidly develop, deploy and monitor machine learning solutions in a reliable, scalable and cost-effective way.
We're looking for a Senior Machine Learning Engineer - with strong Engineering experience - who enjoys solving complex engineering challenges at scale. This role is ideal for someone with a strong software engineering/MLOps, distributed systems or platform engineering background who wants to work at the intersection of machine learning and production infrastructure.
As a Senior Engineer, you'll be responsible for designing, building and operating the platforms and services that enable machine learning models to be trained, deployed and served reliably across ASOS.
You'll work closely with Applied Scientists, Software Engineers, Data Engineers and Product Managers to create the tooling, infrastructure and deployment frameworks that power recommendation systems, search relevance, personalisation and emerging AI applications.
This is a highly engineering-focused role with an emphasis on cloud-native systems, platform architecture, automation, observability and operational excellence.
What You'll Be Doing:
Design and build scalable machine learning platforms and infrastructure supporting model training, deployment and serving.
Develop highly available backend services that power recommendation, search and personalisation experiences for millions of customers.
Build and maintain CI/CD pipelines for machine learning and data products.
Design batch and real-time inference architectures using modern cloud-native technologies.
Improve reliability, resilience and performance across ML workloads through monitoring, observability and automation.
Build tooling and frameworks that enable data scientists and ML engineers to deploy models safely and efficiently.
Own production services, infrastructure and operational excellence practices, including incident management and root cause analysis.
Optimise distributed compute workloads and resource utilisation across cloud environments.
Drive Infrastructure-as-Code adoption and platform standardisation across machine learning systems.
Contribute to architectural decisions across recommendation, search and AI platforms.
Mentor engineers and promote software engineering best practices across the organisation.
Help shape ASOS's long-term machine learning platform strategy.
/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.
But how are we showing up? We’re proud members of Inclusive Companies, are Disability Confident Committed and have signed the Business in the Community Race at Work Charter and we placed 8th in the Inclusive Top 50 Companies Employer list.
Everyone needs some help showing up as their best self. Let our Talent team know if you need any adjustments throughout the process in whatever way works best for you.
/02 Job Qualifications
We're interested in candidates who bring experience across modern software engineering, distributed systems and machine learning infrastructure. We recognise that expertise can be developed through a variety of backgrounds, including Backend Engineering, Platform Engineering, Site Reliability Engineering (SRE), Cloud Engineering, MLOps or Machine Learning Engineering.
We'd love to see experience in several of the following:
Strong software engineering fundamentals with experience designing and building production systems at scale.
Experience developing distributed systems, microservices or high-throughput backend platforms.
Strong programming skills in Python, Java, Kotlin, Go, Scala or similar languages.
Experience building and operating services in AWS, Azure or GCP environments.
Hands-on experience with Kubernetes, containerisation and cloud-native technologies.
Experience implementing CI/CD pipelines and automated deployment processes.
Knowledge of Infrastructure-as-Code tools such as Terraform, Pulumi or CloudFormation.
Experience with monitoring, alerting and observability tooling.
Experience building reliable, resilient and scalable systems with a focus on performance and operational excellence.
Experience working with data-intensive systems, streaming technologies or large-scale distributed processing platforms.
Exposure to machine learning systems, model serving, feature stores, training infrastructure or MLOps practices.
Experience supporting recommendation systems, search platforms, personalisation engines or other customer-facing data products is advantageous.
Comfortable providing technical leadership, mentoring engineers and influencing architectural direction.
Strong collaboration and communication skills, with experience working in cross-functional product teams.
Experience supporting large-scale model training and inference workloads.
Knowledge of vector search, ranking systems, retrieval architectures or recommendation platforms.
Exposure to LLMs, Generative AI and production AI systems.
Experience building internal developer platforms, engineering enablement tooling or shared capabilities used across multiple teams.
/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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what our people say
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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
what our people say
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.