Data Scientist

We’re reinventing payments. In less than four years, Dojo disrupted the market to become the largest and most loved acquirer in the UK. Our payments infrastructure, purpose-built for in-person commerce, is game changing.

Now, over 150,000 customers across four countries choose to transact billions with us every year. But we’re just getting started.

Our people are the driving force behind our success. They are our greatest investment and our ultimate competitive advantage. We hire exceptional people and give them the autonomy, trust, and ownership to thrive. The results take care of themselves.

The role

A Machine Learning Data Scientist designs, builds, and deploys the scalable models and algorithmic systems powering Dojo’s automated decisions—from fraud prevention to operational efficiency. Where off-the-shelf scripts promise easy answers, your job is to build systems that survive production: balancing statistical rigor with clean software engineering to ensure our algorithms are robust, interpretable, and scale flawlessly.

On our Builder track, you'll focus on deep algorithmic execution, numerical optimization, and software craft. You're the person the team turns to when a prediction or optimization problem is hard, standard machine learning isn't enough, or a model degrades in the wild. You protect the integrity, reliability, and long-term health of our live production systems.

What you will do...

• Own workstreams: Drive technical projects from ideation to production, anticipating domain problems and aligning your roadmap with key commercial levers.
• Design pragmatic systems: Tackle complex modeling problems and design end-to-end ML systems, prioritizing robustness and maintainability over over-engineering.
• Formulate optimization solutions: Build numerical optimizers (LP/MIP), tune solvers, and design custom heuristics when exact objective functions or data are scarce.
• Maintain production rigor: Take responsibility for live models, monitoring for drift, preventing train/serve skew, and debugging subtle mathematical failures.
• Write production-grade code: Write well-structured, tested Python and SQL at scale, using Databricks and advanced data manipulation techniques.
• Drive AI workflows: Safely leverage AI tools to boost development productivity, while rigorously verifying output logic and optimization reasoning.

What you will bring...

• Mathematical grounding: Strong statistical background to reason about bias/variance and model evaluation, diagnosing subtle failures from first principles.
• Optimization & heuristics: Experience formulating business constraints into numerical optimization problems and designing custom heuristic algorithms.
• Python & SQL craft: Mastery of Python, Databricks, and the modern ML ecosystem, combined with writing highly efficient, scalable SQL.
• Production MLOps: Practical experience maintaining live models, including CI/CD pipelines, reusable feature architectures, and drift detection.
• Technical honesty: Commitment to evaluating models rigorously using metrics reflecting true business value, and communicating limitations transparently.
• Collaborative leadership: Track record of owning components end-to-end, cutting through ambiguity, mentoring junior peers, and setting engineering standards.