Data Scientist - Credit Risk Modelling

iwoca; City of Westminster; Vor Ort; GBP 60.000 - 90.000; Vollzeit

Benefits dieser Stelle

Flexible working hours

Medical insurance

Private GP service

25 days holiday per year

Birthday day off

Sabbatical after 4 years

Counselling access

Pension contributions

Equity incentive scheme

Parental leave

Nursery tax benefit

Electric car scheme

Company retreats

Learning & development budget

Zusammenfassung

iwoca is hiring a Data Scientist in Credit Risk Modelling to build and maintain probabilistic models using lending data. You will contribute from day one, improving existing production models and exploring research ideas with senior data scientists.

The role emphasizes AI-driven prototyping, model calibration, and collaboration across the Credit Risk Modelling team for UK and German lending. Offices in London and other cities support a flexible working environment.

Qualifikationen

• Background in statistics from a quantitative field (degree or Master’s).
• Able to quantify uncertainty in estimates and treat calibration as a first-order concern.
• Proven track record testing new modelling ideas and judging which to pursue.
• Ability to critically evaluate model output and defend reasoning under challenge.
• Ability to take ambiguous problems from framing to business decisions and provide early answers.

Aufgaben

• Develop probabilistic ML models for credit decisions and CLtV.
• Maintain and improve existing models as market conditions change.
• Prototype and test AI-enabled modelling pipelines and automation.
• Collaborate with senior data scientists to shape research directions.

Kenntnisse

Applied statistics

Probabilistic reasoning

Research mindset

Judgement

Analytical ownership

AI leverage

Communication

Ausbildung

Bachelors/Masters in Statistics or Mathematics or Physics

Tools

Python

Jobbeschreibung

As a Data Scientist in Credit Risk Modelling, you'll use iwoca's lending data to answer credit risk and CLtV questions, and build what you find into the team's production models. The work ranges from keeping today's models accurate as conditions change, through incremental improvements, to research that could replace them. You'll help choose the team's projects and put forward your own. With AI, prototyping is cheap enough for you to test ideas that once wouldn't have made the priority list. The R&D share of the role is growing as a result. You'll learn credit modelling in depth from several senior data scientists.

Live examples of the work:

• Causal estimation of offer terms. Estimating the causal effect of amount, duration, and price on customer outcomes.


• Unifying automated and manual models. Finding a principled way to put the two model families, which optimise slightly different objectives, on a common cost function.


• IFRS accounting model. Developing a multi-stage model where recovery predictions feed back to improve the upfront loss estimates that International Financial Reporting Standards (IFRS) require.


• Generalising credit and CLtV. Exploring whether a single, more general model could replace the separate credit and CLtV models.

The requirements

• Applied statistics. You have a background in statistics from a quantitative field - typically a degree or Master's in Statistics, Mathematics, Physics, or similar. You've applied it to real-world data, in research or at work. You know when the data breaks a method's assumptions, and what that does to your answer.


• Probabilistic reasoning. You quantify the uncertainty in each estimate, and treat calibration as a first-order concern.


• Research mindset. You've tested new modelling ideas of your own, and judged which were worth taking further.


• Judgement. You critically evaluate model output - yours, a colleague's, or an LLM's - and can explain why a choice is right. You defend your reasoning under challenge, and challenge others' when the evidence points elsewhere.


• Analytical ownership. You've taken ambiguous problems from framing the question to a decision the business acted on. You give an early answer and update it as new evidence comes in.


• AI leverage. You've used AI to produce work you couldn't have delivered without it - a prototype, an automation, or a modelling pipeline others use. You judge where it helps and where it doesn't.


• Communication. You write and speak clearly, directly, and concisely. You adapt technical detail to your audience.

Bonus

• Domain experience. You've worked in credit risk, lending, or customer lifetime value modelling.


• Production ML. You've built supervised ML models end to end - exploration, training, deployment, and monitoring.


• Non-linear methods. You can think in terms of the cost function and inductive biases of your models.


• Bayesian methods. You've used hierarchical models, MCMC, or Bayesian updating in real work.


• Time series modelling. You've modelled temporal data where autocorrelation, drift, or seasonality mattered.


• Coding. You can write code for analysis. The team works in Python.

Small businesses move fast. Opportunities often don't wait, and cash flow pressures can appear overnight. To keep going, and growing, SMEs need finance that's as flexible and responsive as they are.

That’s why we built iwoca.

Our smart technology, data science and five-star customer service ensures business owners can act with the speed, confidence and control they need, exactly when it's needed. We've already cleared the way for 100,000 businesses with more than £4 billion in funding. Our passionate team is driven to help even more SMEs succeed, through access to better finance and other services that make running a business easier. Our ultimate mission is to support one million SMEs in their defining moments, creating lasting impact for the communities and economies they drive.

The Credit Risk Modelling team owns credit risk and customer lifetime value (CLtV) modelling for iwoca's UK and German lending. That covers the probabilistic machine learning models behind every credit decision, plus the CLtV models that shape pricing and portfolio strategy. The team is around twelve data scientists, who combined create models to efficiently drive fully automated and human-in-the-loop decision making. This forms the core analytical team that interface with and support smaller analytic functions in other parts of the business.

At iwoca, the best idea wins. We model our culture on independent thinking, challenging untested logic, and evidence-based decisions. We prioritise learning and growth, and give people the autonomy to develop in the direction that makes them most effective. We're a tech company and believe in the power of AI to help us work faster and better. We provide the infrastructure where every iwocan always has access to the best models and where those models have access to all of our data. We will help our people to learn how to use and grow with the new tools available to them.

The offices

• Offices in London, Leeds, Berlin, and Frankfurt with plenty of drinks and snacks.


• Events and community-led groups, including running groups, padel, and monthly ping-pong and pool competitions.

Pay

We expect to pay from £60,000 - £90,000 for this role. But, we're open-minded, so definitely include your salary goals with your application. We routinely benchmark salaries against market rates, and run quarterly performance and salary reviews.

The benefits

• Flexible working hours.


• Medical insurance from Vitality, including discounted gym membership.


• A private GP service (separate from Vitality) for you, your partner, and your dependents.


• 25 days' holiday per year, an extra day off for your birthday, the option to buy or sell an additional five days of annual leave, and unlimited unpaid leave.


• A one-month, fully paid sabbatical after four years.


• Instant access to external counselling and therapy sessions for team members that need emotional or mental health support.


• 3% Pension contributions on total earnings.


• An employee equity incentive scheme.


• Generous parental leave and a nursery tax benefit scheme to help you save money.


• Electric car scheme and cycle to work scheme.


• Two company retreats a year: we've been to France, Italy, Spain, and further afield.

Learning & development

• A learning and development budget for everyone.


• Company-wide talks with internal and external speakers.


• Access to learning platforms like Treehouse.