(English below)




SlackGitHubPull RequestWikiGo FridayGogopherGopher


Protocol Buffers + gRPC I/F

Vol.25 @hamakn


Google Cloud Platform(Compute Engine, Kubernetes Engine, Spanner, Cloud SQL, Datastore, Storage, Stackdriver Logging, Dataflow, Pub/Sub, etc.)


BigQuery / Looker / Data Studio

Stackdriver Monitoring / Datadog / PagerDuty / Sentry/

CI/CDCircle CI / Spinnaker

Knowledge ToolCrowi / Confluence

GitHub / Slack

: Agile (Scrum, Kanban, etc.)














Sick Leave







Mercari Engineering Blog

VP of E

merpay tech openness


Building trust for a seamless society

Trust & Openness

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.

About Merpay

Merpay is going far beyond payment services to offer social infrastructure for all aspects of daily life. We value openness in meetings with users, other companies, financial institutions, local government bodies, and our many other stakeholders, as we work to strengthen collaboration with the marketplace app Mercari. Together with Mercari, weve created an ecosystem offering new kinds of distribution, selling, buying, and credit services. We hope that through this ecosystem, we can forever transform the role that money and consumer spending play in our lives.

Mission: Building trust for a seamless society

Merpays services dont stop at just buying and selling items; by building a new form of trust which can be applied to many areas of daily life, we seek to achieve a world where each person can more freely obtain the things they want and fulfill the dreams they carry. Our mission is to transform society, peoples relationship with money, the way people work, and how people achieve their dreams.

Working at Merpay

Merpay is home to some of the greatest experts within Mercari Group. Our commitment to a culture of openness allows members to discuss architecture on Slack channels organized by business domain, send pull requests to each other on GitHub, and share knowledge on the internal Wiki. We hold Go Friday and other weekly study groups for engineers but open to all, encouraging engineers to help one another grow. Some members have no experience developing in Go before they join, but we help turn them into Go enthusiasts early on through involvement in our internal Go community and Gopher Dojo, our short-term, intensive training. Members further develop their expertise while demonstrating their abilities at both internal and external engineering community events.

Job Description

Handle web application and API development in Go

API/interface design for microservices using Protocol Buffers and gRPC

Improving services and measuring effectiveness using quantitative and qualitative analysis on user behavior logs, etc.

Design architecture and select middleware based on application requirements

Establish user stories achieved by identifying and solving user problems through user survey and analysis

Microservice performance tuning, monitoring, and alert handling

Related Information:

Development Environment

Programming languages: Go

Infrastructure: Google Cloud Platform(Compute Engine, Kubernetes Engine, Spanner, Cloud SQL, Datastore, Storage, Stackdriver Logging, Dataflow, Pub/Sub, etc.)

Configuration management tools: Terraform

Analysis Platform: BigQuery / Looker / Data Studio

Monitoring: Stackdriver Monitoring / Datadog / PagerDuty / Sentry/

CI/CD: Circle CI / Spinnaker

Knowledge Tool: Crowi / Confluence

Other: GitHub / Slack

Development Method: Agile (Scrum, Kanban, etc.)


Minimum Requirements

A shared belief in Merpays mission and values

Knowledge and experience in web application development (experience developing in Go is not mandatory)

Experience designing schemas and creating efficient queries for databases (such as RDB, NoSQL, etc.)

Experience operating web applications and conducting performance tuning, knowledge in security

Experience selecting middleware and designing software architecture

Ability to take ownership and lead the software development process


Experience developing and operating using Go and GCP

Experience developing and operating large-scale, high traffic systems

Experience establishing new services and tackling the challenges in the growth phase of a service

Experience as developer lead or management / experience improving the development process

Experience in statistical data analysis

Language Skills (Reading/Writing/Speaking)

English: Conversational LeveL (Optional)

Japanese: Conversational LeveL (Required)

Working Conditions

Employment Status

Permanent employee (The employee will be hired by Mercari, Inc. on secondment to Merpay, Inc. Further details will be provided during the interview process.)

Probationary period: first 3 months after joining the company. (During this period your contract conditions will be the same as that of a permanent employee.)

Work Location

Roppongi Hills Mori Tower, 6-10-1 Roppongi, Minato-ku, Tokyo

Possible to select full remote working from home or working in the office.

Strengthened measures against passive smoking: No smoking on the premises

Work Hours

Fixed working hours: 10 AM - 7 PM

Flextime system (full flextime with no core hours)


Annual salary paid in 12 installments, once a month

Based on skills, experience and abilities

Reviewed twice a year


Two days off per week (as well as national holidays, New Years break, etc.)

Paid leave, congratulatory and bereavement leave, relax days, sick leave


Complete health and social insurance

Incentive program

Employee stock ownership plan

Full transportation cost coverage

Custom PC

Dual screen setup available on request

Company smartphone

Visa support

mercibox benefits for employees and their families


Recruitment Flow

Document screening

Technical assessment (Go) *You will be developing in Go upon joining the company.

2-3 interviews

Merpay Homepage

Mercari Engineering Blog

Merpay Chapter 3: Two VPs of E (only available in Japanese)

Merpay tech openness (only available in Japanese)


Our Values

Merpays Business Concept

Merpays Deferred Payment: Concrete Measures to Protect Against Predatory Usage (only available in Japanese)

Merpay Concept Movie

[Building trust for a seamless society]

[Trust & Openness]

What is Merpay Deferred Payment? Intro Movie

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