Software Engineer, Machine Learning

Tokyo, Japan · Engineering · EN/JP


At Mercari, our mission is to create value in a global marketplace where anyone can buy & sell, and we pride ourselves in taking on a challenge. We are looking for new members to join us in achieving this goal under our values - Go Bold, All for One, and Be Professional.

株式会社メルカリでは「新たな価値を生みだす世界的なマーケットプレイスを創る」というミッションを掲げ、あらゆる挑戦をしています。「Go Bold - 大胆にやろう」「All for One - 全ては成功のために」「Be Professional - プロフェッショナルであれ」という3つのバリューのもと、ミッション達成を共に目指していける仲間を募集しています。

As a Machine Learning Engineer at Mercari, you will apply your machine learning skills to develop the Mercari C2C (consumer to consumer), marketplace app. Advancements in machine learning and computational resources are leading to remarkable innovations in both technology and business. We are actively utilizing advanced machine learning technologies in order to provide a more convenient and fun marketplace.

You will be responsible for analyzing C2C purchasing data in order to provide our users with a better, safer e-commerce experience.

What you will be doing:

- ImprovingEnhance customer's behavior prediction.

- Carrying out anomaly detection.

- Providing a recommendation engine.

- Optimizing itemproduct search algorithms.

- Developing a system for image recognition.

Working together with our server-side engineers and data scientists, you will be involved with the end-to-end development processes, from algorithm design to implementation.

仕事内容 / Responsibilities

機械学習技術を活用して、フリマアプリ「メルカリ」の機能・サービス開発を行っていただきます。 機械学習技術の向上や計算機資源の充実に伴い、機械学習技術を応用した技術・サービスも近年著しく発展しています。 高度な機械学習技術を積極的に取り入れて、より便利で楽しいマーケットプレイスを提供します。

本ポジションのエンジニアは、お客様に便利に安全に売買を楽しんでいただくために、購買データや取引データをもとに、機械学習の技術を用いて、検索最適化、画像認識、行動予測、異常検知、レコメンドなど多岐にわたる課題に取り組んでいただきます。 弊社のサーバサイドエンジニアやデータサイエンティストと連携しながら、アルゴリズム設計からサービスへの実装まで携わっていただきます。


▼ Minimum Requirements

- Experience and expertise in machine learning.

- Experience working on end-to-end development of machine learning applications, including prototyping, model evaluation, and error analysis, using Python or other languages.

- Experience developing web services using Flask, Django, or other web frameworks.

- Fundamental knowledge of RDBMS and SQL.

- Experience leading various projects and, proposing solutions to tackle problems, based on knowledge of domain-specific services and systems.

- Ability to read and understand technical papers and documentation.

▼ Preferred

- Experience with large-scale data analysis and processing.

- Experience using TensorFlow, Chainer, Caffe, or other deep learning frameworks.

- Experience developing and maintaining microservices using Docker/Kubernetes.

- Experience using cloud services such as AWS or GCP.

- Experience publishing or presenting academic papers.

- Experience applying for patents.




▼Contract Type


 Probationary Period: 3 months (salary same as above)



▼Work Hours

・Fixed working hours 10:00-19:00

 Flex time (core hours 12:00-16:00, 60 minute lunch)


・Annual salary, paid monthly

・Based on your experience, skills and potential

・Reviewed twice a year


・5-day work week (Sat/Sun off)

・National holidays, paid time off, summer/New Year's vacation, congratulatory leave, compassionate leave








 フレックスタイム制度あり(コアタイム:12:00~16:00 [休憩60分] )









・Health insurance

・Incentive program

・Employee stock ownership plan

・Full transportation coverage

・Custom PC

・Dual screen if needed

・Company smartphone

・Visa support

・New Employee Benefits at Mercari「mercibox













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