Ad Tech Engineer, Machine Learning Engineer – Marketplace

Mercari, Inc.

Ad Tech Engineer focused on machine learning development for Mercari's advertising solutions. Leading model optimization and driving data-driven improvements in ad performance.

Posted 6/1/2026full-timeMinato City • 🇯🇵 JapanMid-LevelSeniorWebsite

Tech Stack

Tools & technologies

ETLGoKubernetesMicroservicesPythonScikit-LearnSQL

About the role

Key responsibilities & impact

Lead optimization areas in the Ad-Tech domain.
Utilize data science and machine learning technologies to identify business challenges, develop and implement models, and continuously improve productivity and reliability through iterative enhancements.
Focus on mid to long-term business goals and impact, propose key issues to be resolved, and prioritize them effectively.
Employ a data-driven approach to formulate hypotheses, design evaluation strategies, and develop appropriate machine learning models.
Propose, promote, implement, and validate business improvement plans.
Develop and maintain machine learning models in the advertising domain, including recommendation systems, matching optimization, and ad classification.
Apply statistical and data science techniques to uncover product insights and drive optimization based on business logic.
Enhance the performance of advanced machine learning models by leveraging embeddings for images and text.
Design time-series models to evaluate advertising effectiveness and optimize advertising budget strategies.

Requirements

What you’ll need

Someone who can align with the mission and values of the Mercari Group and its companies.
Experience in leading the optimization domain in Ad-Tech and creating significant business impact.
Basic knowledge of the digital marketing domain.
Experience in constructing the entire process from planning and designing data analysis to performing analysis and delivering actual outputs.
Programming skills in SQL, Python, and Go.
A deep understanding of the fundamentals of machine learning and software engineering.
Experience building models using machine learning libraries such as scikit-learn and LightGBM.
Basic to intermediate knowledge of statistics and data science.
Experience in developing microservices using k8s.
Experience in building and operating large-scale ETL or ELT pipelines.
Experience in developing and operating recommendation models for advertisements.
Experience in large-scale search systems.
Language Requirements (one of the following):
Japanese: Native (required) / English: B2 (required)
English: Native/Fluent (required) / Japanese: nice to have

Benefits

Comp & perks

🌐 Worldwide Post a Job Affiliates Search Remote Jobs Mercari, Inc. Website LinkedIn All Job Openings 1001 - 5000 employees Founded 2013 🛍️ eCommerce 🏪 Marketplace 🌍 Social Impact eCommerce
Marketplace
Social Impact Mercari, Inc. is a marketplace platform that allows users to buy and sell various items, offering a convenient and efficient way for individuals to engage in commerce. The company emphasizes innovation, diversity, and inclusion in its work culture while striving to unleash the potential of its employees. With a commitment to sustainable practices, Mercari aims to create a positive impact within the communities it serves and beyond. Ad Tech Engineer, Machine Learning Engineer – Marketplace 🔥 39 minutes ago 🏢🏡 Minato City – Hybrid ⏰ Full Time 🟡 Mid-level 🟠 Senior 🤖 Machine Learning Engineer 🗣️🇯🇵 Japanese Required ETL Kubernetes Microservices Python Scikit-Learn SQL Go Apply Now Find Similar Remote Jobs Receive Emails For Remote Jobs 📊 Check your resume score for this job Improve your chances of getting an interview by checking your resume score before you apply. Upload Resume Report problem 📋 Description
Lead optimization areas in the Ad-Tech domain.
Utilize data science and machine learning technologies to identify business challenges, develop and implement models, and continuously improve productivity and reliability through iterative enhancements.
Focus on mid to long-term business goals and impact, propose key issues to be resolved, and prioritize them effectively.
Employ a data-driven approach to formulate hypotheses, design evaluation strategies, and develop appropriate machine learning models.
Propose, promote, implement, and validate business improvement plans.
Develop and maintain machine learning models in the advertising domain, including recommendation systems, matching optimization, and ad classification.
Apply statistical and data science techniques to uncover product insights and drive optimization based on business logic.
Enhance the performance of advanced machine learning models by leveraging embeddings for images and text.
Design time-series models to evaluate advertising effectiveness and optimize advertising budget strategies. 🎯 Requirements
Someone who can align with the mission and values of the Mercari Group and its companies.
Experience in leading the optimization domain in Ad-Tech and creating significant business impact.
Basic knowledge of the digital marketing domain.
Experience in constructing the entire process from planning and designing data analysis to performing analysis and delivering actual outputs.
Programming skills in SQL, Python, and Go.
A deep understanding of the fundamentals of machine learning and software engineering.
Experience building models using machine learning libraries such as scikit-learn and LightGBM.
Basic to intermediate knowledge of statistics and data science.
Experience in developing microservices using k8s.
Experience in building and operating large-scale ETL or ELT pipelines.
Experience in developing and operating recommendation models for advertisements.
Experience in large-scale search systems.
Language Requirements (one of the following):
Japanese: Native (required) / English: B2 (required)
English: Native/Fluent (required) / Japanese: nice to have Apply Now

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Hard Skills & Tools

machine learningdata scienceSQLPythonGoscikit-learnLightGBMstatisticsETLELT

Soft Skills

leadershipdata-driven approachproblem-solvingcommunicationprioritizationcollaborationstrategic thinkingadaptabilitycritical thinkingbusiness acumen