Software Engineer, Backend

  • Tokyo
  • Remote OK - Anywhere in Japan
  • Full-time
  • April 24, 2024
Apply from Anywhere 👍
Relocation to Japan 👍
(Overseas visa sponsorship supported)
Language Requirements
Japanese: Not Required 👍
English: Business Level

Position Overview

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 microservice 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

  • Microservice performance tuning, monitoring, and alert handling

Development Environment

  • Programming languages: Go

  • Infrastructure: Google Cloud Platform (Compute Engine, Kubernetes Engine, Spanner, Cloud SQL, 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.)

Required Experience

  • Shared belief in Merpay’s mission and values

  • Knowledge and experience in web application development

  • 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

Preferred Experience

  • Experience developing and operating using Go and GCP

  • Experience developing and operating large-scale, high traffic system

  • 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 Requirements

  • English: Proficient (CEFR - C1) preferred

  • Japanese: Independent (CEFR - B2) preferred

  *For details about CEFR, see here

Working Conditions

Employment Status


  • 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.)



  • Smoking is prohibited within our offices

  • Mercari has introduced a work style policy called “Your Choice.” Each member is free to choose whether they want to work in the office or work fully remote. *Exceptions made for certain kinds of work.


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