Senior Machine Learning Engineer

About this role

At ASOS, machine learning is a core part of how millions of customers discover products, engage with our brand and shop every day. We're looking for a Senior Machine Learning Engineer to join our Customer & Martech team. In this role, you'll help build and scale machine learning products that support customer growth, marketing effectiveness, pricing and personalisation. You will work with some of ASOS's richest datasets, including customer behaviour, transactions, marketing interactions and product data, turning these into production-grade machine learning systems that deliver measurable value for customers and the business.

Working alongside Applied Scientists, Data Engineers and Machine Learning Engineers, you'll contribute across the full lifecycle of machine learning products, from ideation and experimentation through to deployment, monitoring and optimisation. Whether improving customer retention, optimising marketing investment, supporting intelligent pricing decisions or helping build the next generation of customer experiences, you'll work on complex challenges at significant scale.

What you'll be doing: Design, build and operate machine learning systems that support customer engagement, marketing effectiveness, pricing and commercial decision-making. Own the end-to-end engineering lifecycle of machine learning products, including data ingestion, feature engineering, deployment, monitoring and optimisation. Productionise advanced machine learning solutions and ensure they operate reliably at ASOS scale.

Partner closely with Applied Scientists to translate research and experimentation into scalable production systems. Help shape the future of our MLOps platform by contributing to engineering best practices, operational excellence and platform capabilities. Build reusable tooling, frameworks and infrastructure that accelerate machine learning delivery and reduce operational overhead. Influence technical direction and architectural decisions across machine learning products and platforms.

Mentor colleagues and support high standards of engineering quality, reliability and scalability. This is an opportunity to work on machine learning products used by millions of customers, leveraging rich datasets across customer behaviour, marketing, pricing and ecommerce. You'll collaborate with Applied Scientists, Machine Learning Engineers and Data Engineers to solve complex challenges at the intersection of machine learning, software engineering and large-scale data systems, while seeing the direct impact of your work on customer experience and commercial outcomes.