Senior Data Scientist at Mercari

Setup: Hybrid
Location: Tokyo
Type: Full-time
Level: Senior
Posted: Feb 20, 2026

Description

Mercari is seeking a Senior Data Scientist to lead complex product and technical initiatives aimed at maximizing user engagement and long-term value (LTV) through sophisticated models and systems for Personalized CRM. The role involves designing and deploying inference pipelines, conducting end-to-end data exploration, translating technical insights into actionable recommendations, and promoting best practices in analytics and code quality. The successful candidate will own the entire project lifecycle, contributing to cutting-edge CRM and personalization solutions.

Required Skills

Advanced Analytics
Statistical Analysis
Machine Learning Algorithms
A/B Testing
Causal Inference
Python
SQL

Additional Information

Required Previous Experiences: 5+ years of experience using advanced analytics and/or systems to drive strategic business decision-making
Preferred Qualifications: Strong ownership and P/L mindset: Proven track record of taking full responsibility for achieving business KPIs; a results-first mindset that ensures data science initiatives translate directly into measurable revenue growth
Relentless execution: Ability to complete projects with high quality and a sense of speed, even when facing technical obstacles or shifting priorities
Domain expertise: Experience in marketing science or CRM optimization in a fast-growing tech environment
MLOps capability: Experience as an ML engineer developing and operating production-grade inference pipelines (both batch and real-time streaming)
Leadership: Proven experience leading large-scale projects end-to-end—from initial proposals and resource planning through final delivery and maintenance

About Mercari

Mercari

Discover deals on everything from secondhand fashion to pre-owned collectibles, electronics, books & more on Mercari. Your go-to marketplace for hassle-free selling and deals.