Require only EnglishBackend Engineer Leader for someone living in Japan

Job Title

Backend Engineer Leader

For someone living in Japan!

Company Overview

A tech-driven company focusing on transforming financial services through innovative solutions. They provide numerous services that help simplify financial management for both individuals and businesses.

Your Role and Responsibilities

Develop HR solution products using Ruby on Rails or Kotlin. (Most products are currently in Ruby on Rails; Kotlin migration is underway.)

Design and implement detailed specifications for new product features.

Refactor and enhance existing codebases and test coverage.

Ensure high product quality through thorough code reviews and testing.

Identify development issues suggest improvements and implement solutions.

Plan and design cross-product system architecture.

Experience and Qualifications

Bachelors degree in Computer Science Engineering or a related technical discipline.

5 years of hands-on experience in designing developing and maintaining web applications.

Proven ability to mentor and support junior or peer engineers fostering growth and technical development.

Active participation in team-wide quality initiatives such as code reviews and test implementation.

Strong skills in independently analyzing and refactoring systems using design patterns and addressing code anti-patterns.

Experience handling incident response: root cause analysis rapid resolution and long-term fixes.

Ability to adapt to diverse technology stacks and readiness to learn Ruby on Rails if not already proficient.

Japanese: Basic proficiency is a plus (reading and understanding technical documents).

English: Fluent in both written and spoken communication.

Technology Stack

Backend: Ruby Ruby on Rails GraphQL gRPC Sidekiq Pro RSpec Kotlin

Frontend: TypeScript Bootstrap-vue Vue Apollo Jest

Infrastructure: AWS (EKS Aurora ElastiCache S3) Terraform

Tooling:

Source control: GitHub

Project tracking: JIRA

Monitoring: Datadog Rollbar

CI/CD: CircleCI ArgoCD GitHub Actions

Communication: Zoom Slack Figma Miro

Additional Preferred Qualifications

Familiarity with Ruby Ruby on Rails Kotlin SpringBoot and React.

Experience working in Agile environments particularly Scrum-based teams.

Skilled in designing writing and executing tests using tools such as RSpec Jest JUnit or Playwright.

Proficiency in middleware performance tuning including database optimization.

Experience designing building and operating microservices and understanding scalable architecture.

Ability to make sound architectural decisions and choose appropriate technologies.

Experience developing AI solutions or utilizing AI tools to optimize the development lifecycle.

Good Reasons to Join

- Engage with advanced financial technologies.
- Lead impactful projects in a dynamic and innovative environment.
- Work within a collaborative international team setting

Work Style

Hybrid work 2-3 days to the office.

Work Location

Tokyo

Salary

Negotiable