Senior Generative AI Engineer
Role Summary
Detailed description available on the official website.
About the Organisation
Motorway is the UK's largest online car-selling platform. We connect private sellers directly with over 8,000 dealers nationwide. Our online platform helps sellers achieve great prices for their cars while giving dealers fast, reliable access to the stock they want for their dealerships. Founded in 2017, our award-winning, technology-led approach has redefined the experience of selling a car. Motorway is backed by some of the world’s leading technology investors, having raised £143 million in Series C funding.
This is a unique opportunity to join a fast-growing scale-up at a crucial phase of growth and help change an industry for the better.
GenAI Engineering sits within Motorway's Data and AI function, alongside Machine Learning and the Machine Learning Data Platform. We own the AI features that shape how buyers and sellers experience the marketplace, from agentic workflows in the customer journey to LLM-powered tooling for our dealer network.
What we build goes into the hands of real sellers and thousands of verified dealers, usually within weeks. When it works, someone sells their car more easily. When it doesn't, we hear about it. That feedback loop is short, and it shapes how we work. We have a track record of successful deployments and a strong reputation as a result.
We're looking for a Senior GenAI Engineer to build AI applications and agentic workflows for Motorway, taking them from rapid prototype through to production-grade systems that deliver measurable value.
You'll take a problem that isn't fully defined yet and see it through to a reliable system running in production: the prompting, the retrieval, the agent design, the evals, the guardrails, the monitoring. You own that whole stack. There's no separate team who "productionises" your work later.
Most of what makes a GenAI feature good sits around the model rather than in it. The prompting is rarely the hard part. Retrieval quality is, and so is the data feeding it, evaluation you can trust, sensible behaviour when things fail, and getting it live and keeping it there. If that's the work you want to do, we're not precious about the route you took to get here. Some of us came through data science and machine learning and deliberately built up our software engineering; others came the other way.
- You've shipped AI or ML systems that real users depend on, and you've stayed close enough to production to know how they behave when they break.
- Strong Python, and SQL you genuinely use. A lot of this work is data work: assembling grounding data, building golden datasets, and digging into why something failed.
- You've invested deliberately in your software engineering craft: testing, error handling, CI/CD, observability, and the MLOps practices that keep things healthy once they're live.
- You're hands-on across the GenAI stack: LLM APIs, retrieval and vector stores, agents with tool use, and structured outputs, running on cloud infrastructure (we use AWS and GCP).
- You have a real point of view on evaluation, most likely because you've been caught out by a system that looked fine and wasn't.
- You can reason about how models fail, including hallucination and prompt injection, and what that means for someone who trusts the output.
- You know when to reach for a model, when something simpler will do, and when to stop.
- You're a constructive reviewer, and colleagues are better off for having worked alongside you.
Working Conditions
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- Competitive salary
- Equity scheme - we all share in Motorway's success
- 25 days holiday
- Flexible working (2 days a week in our London office, with socials and snacks galore)
- Private medical insurance via BUPA
- Life assurance
- Pension scheme (we contribute 5%)
- Enhanced family leave (e.g. 26 weeks full pay for maternity or adoption)
- 24/7 Employee Assistance Programme
- EV leasing scheme
- Cycle to work scheme
- Nursery salary sacrifice scheme
- 1 paid volunteering day a year
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