Data Scientist - ML Research & Production for Payments

Checkout Ltd; Greater London; Hybrid; GBP 75,000 - 110,000; Full time

Job summary

Checkout.com in the United Kingdom is seeking a Data Scientist to advance ML models and estimators that boost payment performance across our merchants portfolio. You will collaborate with Data Scientists, Product, and Engineering to deploy robust features and maintain observability for safe model launches.

You will design experiments, handle time‑based data leakage, and communicate results clearly, leveraging Python for model training and productionizing features across core products.

Qualifications

• 3+ years of experience developing machine learning models to solve business problems.
• Strong understanding of supervised ML algorithms, tuning, and performance evaluation.
• Experience with a range of feature engineering techniques (e.g., target encoding).
• Solid grasp of frequentist and Bayesian statistics for parameter estimation and experimentation.
• Experience in writing clean, production-grade Python code for both model training and inference.
• Excited to leverage LLMs for coding support and process optimisation to maximise personal and team productivity.

Responsibilities

• Contribute to the research and development of new ML models and estimators to boost core Acceptance Rate performance.
• Design and implement experiments to produce actionable insights, focusing on managing time‑based data leakage and ensuring robust model evaluation.
• Collaborate with other Data Scientists and engineers to productionise ML features, models, and evolve our evaluation and monitoring frameworks.
• Write high‑quality, interpretable Python code for feature engineering and model training, contributing directly to our core products.
• Communicate hypotheses, evaluation results, and monitoring dashboards clearly to both technical and non‑technical audiences.

Skills

Machine learning

Python

Experiment design

Feature engineering

Statistics

Communication

LLM usage

Tools

Databricks

Docker

GCP

AWS

Job description

Checkout.com in the United Kingdom is seeking a Data Scientist to advance ML models and estimators that boost payment performance across our merchants portfolio. You will collaborate with Data Scientists, Product, and Engineering to deploy robust features and maintain observability for safe model launches.

You will design experiments, handle time‑based data leakage, and communicate results clearly, leveraging Python for model training and productionizing features across core products.