Senior Machine Learning Engineer, Credit ML - Merpay
On-site · Minato City, Tokyo, Japan
Job Summary
Senior ML Engineer, Credit Modeling - Merpay: Contribute to the design, development, and operation of credit models using Mercari/Merpay data. Responsibilities include planning to identify issues and propose solutions, designing evaluation schemes that cover offline metrics, business KPIs, risk metrics, and UX, and building robust operational processes (SLOs, drift detection, performance monitoring, and incident response). Make technical decisions on modeling strategies (interpretability vs performance, online vs batch, real-time requirements, and boundaries with rule-based systems). Lead end-to-end model construction including data analysis, feature engineering, and building ML models for tabular data, maintaining inference/training pipelines, ensuring reproducibility, experiment management, and model quality. Drive consensus with product, business, legal, and compliance stakeholders; explore next-generation credit models; provide technical mentoring to team members. Unique challenges include AI credit at scale within Mercari’s ecosystem and advancing financial inclusion while maintaining UX and reliability. End-to-end ownership from problem discovery to deployment of new credit models across functions.
Required Qualifications
- 3+ years of ML model development with scikit-learn, LightGBM, PyTorch
- 1+ year of ML operations / MLOps including monitoring, alerts, model updates, incident response
- 2+ years experience with SQL and feature engineering
- 2+ years leadership role for teams/projects of 4+ members with mentoring
- Strong communication with stakeholders
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