Data Scientist - iwocaPay Risk Squad

Salary: £70,000 - 110,000 per year

Requirements:

• Expertise in supervised machine learning on tabular data, with experience building and iterating production models end to end from exploration through deployment and monitoring.
• Strong statistical foundations in probability, uncertainty quantification, model calibration, and reasoning about where a model is likely to be wrong.
• Ability to work independently in a messy, early-stage environment, including scoping problems, building infrastructure, and shipping models autonomously.
• Pragmatism about what good enough looks like commercially, balanced with rigour on high-stakes models.
• Data engineering capability, including building pipelines and managing datasets alongside modelling work.
• AI fluency, using AI to build, automate, and accelerate substantive analytical and engineering work.
• Clear communication, with the ability to adapt technical detail for non-technical colleagues in product, risk, and leadership.
• Python proficiency, as this is what our team uses day to day.
• Bonus: experience with credit risk modelling or financial services lending.
• Bonus: familiarity with transfer learning, domain adaptation, or techniques for combining datasets of different sizes and relevance.
• Bonus: experience with non-linear models such as gradient boosting or neural networks on tabular data in production settings.

Responsibilities:

• Co-own the full credit modelling stack with one other data scientist.
• Collaborate on model design, review each others work, and decide what to prioritise.
• Own credit models that decide who iwocaPay can safely fund and on what terms.
• Work on the automated credit decisioning and fraud prevention models that influence every lending decision the product makes.
• Handle counterparty risk, portfolio-level strategy, and ongoing monitoring of losses, chargebacks, and segment performance.
• Improve model performance across segments and test more advanced approaches.
• Build models from scratch for new products.
• Own models end to end, with commercial decision-making responsibility.
• Help build the teams pipelines, monitoring, and processes.

Technologies:

• AI
• Support
• Machine Learning
• Python
• Flow

More:

We are iwoca, a technology-driven finance company supporting small businesses with flexible and responsive funding. Our iwocaPay Risk Squad is a small, growing team in London focused on automated credit decisioning, fraud prevention, counterparty risk, portfolio strategy, and performance monitoring for our B2B Buy Now Pay Later product. We offer a hybrid working environment, offices in London, Leeds, Berlin, and Frankfurt, and a range of benefits including flexible working hours, medical insurance, private GP access, 25 days holiday plus additional leave options, a sabbatical after four years, counselling and therapy support, pension contributions, equity, parental leave, learning budgets, and regular company events and retreats. We value independent thinking, evidence-based decisions, learning, growth, and the use of AI to work faster and better.

last updated 40 week of 2026