Lead Machine Learning Scientist, Search
Monzo · Cardiff
What this role requires
2 requirements, read out of the advert rather than guessed from the job title:
Also mentioned, not required: cloud-native, Python, user embeddings, contextual bandits, personalised ranking algorithms, explainable AI. Worth having, but their absence is not what gets a CV filtered out.
See how often each of these is required across open data roles in Europe.
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Job description
🚀 We’re on a mission to make money work for everyone.
We’re waving goodbye to the complicated and confusing ways of traditional banking.
After starting as a prepaid card, our product offering has grown a lot in the last 10 years in the UK. As well as personal and business bank accounts, we offer joint accounts , accounts for 16-17 year olds , a free kids account and credit cards in the UK, with more exciting things to come beyond. Our UK customers can also save , invest and combine their pensions with us.
With our hot coral cards and get-paid-early feature, combined with financial education on social media and our award winning customer service, we have a long history of creating magical moments for our customers!
We’re not about selling products - we want to solve problems and change lives through Monzo ❤️
Read the full description (41 more sections)Show less
📍London/Cardiff/UK Remote | 💰 £115,000 - £150,000 + Incentive Awards tied to your performance + Benefits ✨
About our Machine Learning Search Team
We are currently embarking on one of our two top strategic priorities to make Money work for Everyone: building the Monzo Co-pilot. We are becoming an intelligent, proactive ally that handles the complexity of users financial life. We aren't just selling financial products; we are building a truly smart agent that understands users, anticipates their needs, and helps people reach their financial goals.
Our ML Search team brings together Backend, Product, Machine Learning Scientists and Data Scientists. As a Lead Machine Learning Scientist, you’ll build and ship models that help customers search for and find answers about their financial lives. You'll make it effortless for them to find the right products at the exact moment they need them.
Whether it’s surfacing the right savings product at the perfect moment, helping customers manage their spending, or simplifying financial planning, our work makes banking smarter, more intuitive, and truly customer-first.
What you’ll be working on:
As a Lead Machine Learning Scientist, you'll be a technical leader and individual contributor. We have a modern, cloud-native data platform with billions of rows of data built for fast iterations. You'll leverage your deep expertise to develop and deploy advanced ML models to our more than 15 million customers.
Your work may involve user and product embeddings to better understand customer behaviours, contextual bandits for optimising real-time decisions, or personalised ranking algorithms that improve search and discovery. You'll also build scalable, explainable, and responsible AI solutions that enhance trust, transparency, and the overall customer experience.
The technical approaches you take to help solve customer problems will be very much in your hands and we’ll strongly encourage and support experimentation and innovation. We’ll be expecting you to justify and demonstrate effectiveness along the way, making sure the approach meets our business and customer needs.
You should apply if:
What we’re doing here at Monzo excites you!
You have a multiple year track record of excellence leading the development and deployment of advanced Machine Learning models to tackle real business problems preferably in a fast moving tech company
You have experience developing and shipping state of the art ML models to production and delivering business impact
You're impact driven and excited to own the end to end journey that starts with a business problem and ends with your solution having a measurable impact in production
You have a self-starter mindset; you proactively identify issues and opportunities and tackle them without being told to do so
You speak Python fluently and have extensive, hands-on experience with <code>scikit-learn</code>. You are comfortable using SQL, and keen to learn Go lang which is used in many of our backend microservices
You’re comfortable working in a team that deals with ambiguity and have experience helping your team and stakeholders resolve that ambiguity
You want to be involved in building a product that you (and the people you know) use every day
You have a product mindset : you care about customer outcomes and you want to make data-informed decisions
You're excited about fast-moving developments in Machine Learning and can communicate those ideas to colleagues who are not familiar with the domain
You’re adaptable, curious and enjoy learning new technologies and ideas
Nice to haves:
Experience working on personalisation, ranking & recommendation problems for consumer applications
Commercial experience writing critical production code and working with microservices
The interview process:
Our interview process involves 3 main stages. We promise not to ask you any brain teasers or trick questions!
30 minute recruiter call
45 minute call with hiring manager
60 minute ML Modelling interview
60 minute Product & ML interview
60 minute behavioural interview
Our average process takes around 3-4 weeks but we will always work around your availability.
#LI-REMOTE #LI-SR1
Equal opportunities for everyone
Diversity and inclusion are a priority for us and we’re making sure we have lots of support for all of our people to grow at Monzo. At Monzo, we’re embracing diversity by fostering an inclusive environment for all people to do the best work of their lives with us. This is integral to our mission of making money work for everyone. You can read more in our blog , 2026 Diversity and Inclusion Report and 2025 Gender Pay Gap Report.
We’re an equal opportunity employer. All applicants will be considered for employment without attention to age, ethnicity, religion, sex, sexual orientation, gender identity, family or parental status, national origin, or veteran, neurodiversity or disability status.
If you have a preferred name, please use it to apply. We don't need full or birth names at application stage 😊
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