Software Engineer, Machine Learning at (Minato City, Japan) - ALL Jobs News

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Saturday, 18 July 2020

Software Engineer, Machine Learning at (Minato City, Japan)


(Japanese follows English)

Announcement about hiring affected under COVID-19 pandemic

Along with many other countries, Japan is expanding entry/visa restrictions in line with the WHO's decision to declare the COVID-19 outbreak a pandemic on March 11th. We are trying our best to minimize the impact, but inevitably we may be unable to continue the hiring process with every candidate at this time. Given the uncertainty of the situation, please kindly understand that we will be prioritizing local applicants (possessing valid working visas, etc.) to ensure a smooth hiring experience. Of course we are maintaining open channels of communication regarding individual cases and will monitor the situation in order to adjust our policies as circumstances change.



Our mission

We are always looking for new challenges to help us fulfill our mission to create value in a global marketplace where anyone can buy & sell.

The world is full of objects and services being produced and sold, but many of them are thrown away without people realizing that they might be valuable to someone else, wasting valuable natural resources. To contribute towards eliminating waste, we have launched Mercari, a marketplace where people can buy and sell easily and safely, in Japan and the United States.

Our three values (Go Bold, All for One, Be a Pro)

We work together to create a global marketplace, but the road to this goal is by no means easy. In order for us to make new innovations and take on new challenges that no one has taken before, all of us take ownership of our work and make use of our knowledge so that we can create the best product possible as one team. To achieve this, we all take action based on our three company values (Go Bold, All for One, and Be a Pro).

The goal of the engineering organization

At Mercari, engineering teams always strive to continuously produce significant results. To do this, our organization constantly welcomes changes and new challenges, cooperates and co-creates, is diverse, offers freedom, and encourages all of us to take ownership and make our own decisions. We want to continue taking on new challenges, working together as one team, going bold, and taking ownership so that we can grow individually, while working toward the realization of Mercaris mission.


As a Platform Engineer of machine learning systems at Mercari, you will be able to apply your infrastructure and platform knowledge to improve and maintain Mercari's Consumer-2-Consumer, so-called C2C, marketplace.

We are actively utilizing advanced machine learning technologies in order to provide a more convenient, safe and fun marketplace.

A Machine Learning Platform Engineer is responsible for improving and maintaining machine learning systems, architected using cloud technologies and Kubernetes.

This is a full time position to work at our Japanese offices in Tokyo. We do not offer remote positions at this time.

What you will be doing:

Writing libraries and frameworks to improve reliability of the ML systems

Apply architecture improvements to existing ML platform, and keep up to date with industry best practices to incorporate them to the AI team operations as it makes sense.

Evangelize best practices of Machine Learning Operations to improve internal practices and educate engineers to improve operation practices

Build and improve monitoring for Machine Learning experiments on mercari products

Collaborate across the organization to build larger infrastructure


Minimum Requirements

Experience operating and maintaining web systems

Over 5 years of experience in software engineering, and at least 3 years in developing applications in Python or Golang

Experience working on end-to-end development of backend system

Fundamental knowledge and skill of security.

Fundamental knowledge and troubleshooting skill of RDBMS, SQL, network, Linux server, surveillance system, logging, and system operation

Good communication and interpersonal skills with the ability to collaborate across the team

English communication skills

Additional qualifications

Experience with large-scale distributed systems (e.g Kubernetes, Hadoop Clusters)

Ability to develop features to improve system performance and reliability

Experience with systems using containerization technologies such as Docker and Kubernetes

Experience using cloud services (e.g. AWS, GCP, Microsoft Azure)

Experience using TensorFlow serving, TensorFlow Lite and ONNX.

Experience developing and maintaining microservices using Docker/Kubernetes.

Japanese communication skills

Language Skills

  • English: Business level

  • Japanese: Daily conversation level (welcomed)


Contract Type


Probationary Period: 3 months (salary same as above)



Strengthened measures against passive smoking: No smoking on the premises

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


Two days off per week, Japanese national holidays, New Year's vacation etc.

Paid Leave, Bereavement Leave, Relax Days, Sick Leave


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 Mercarimercibox

3(Go Bold, All for One, Be a Pro)

3(Go Bold, All for One, Be a Pro)


EngineeringGo Bold









AWSGCPMicrosoft Azure

TensorFlow ServingTensorFlow LiteONNX










Sick Leave




Mercari Engineering Blog


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