Backend Engineer / LINE Creators Market

Position: Backend Engineer
Category: Entertainment
Employment Type: Permanent Employee
Location: Fukuoka

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Job Summary

Team members in this position are responsible for leading the back-end development and operation of creator-focused services for sticker, emoji, and theme features.
Work includes developing features for the registration and sale of stickers, themes, and emojis, as well as related review processes and sales management.
You will contribute to designing and developing a flexible service architecture that enables creators to seamlessly offer a diverse range of products.

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Mission & Goals

• Provide services that enable business features to be developed flexibly and with minimal overhead.
• Foster a positive and supportive team environment.
• Encourage personal growth and autonomy while working on projects.

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Responsibilities

• Develop and operate services in Kotlin and Perl environments.
• Facilitate migration from Perl to Kotlin when modifying existing features.
• Lead back-end service development for user-facing features.
• Design architectures that enhance efficiency and flexibility.
• Ensure high standards of availability, reliability, and fault tolerance.
• Support team members in software implementation and operational best practices.
• Collaborate with other teams, participate in code/design reviews, and support high-quality implementation.

Scope of Change: There is a possibility of reassignment to any duties as determined by the company.

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About the Product: LINE Creators Market

A platform that allows users to create and sell stickers, emoji, and themes on LINE. Anyone with a LINE account can participate, regardless of profession or whether they're an individual or a business.

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Ideal Candidate

• Understands the relationship between business goals and technical choices, making decisions that contribute to business growth.
• Leads design and implementation for stable, continuously growing systems.
• Demonstrates leadership, supports team member growth, and guides technical decisions.

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Required Skills & Experience

• 5+ years of server-side application development experience.
• Experience and skills in issue handling and incident response.
• Knowledge of and experience with scalable data storage technology (e.g., MySQL).
• Fundamental computer science knowledge.
• Business-level verbal communication skills in Japanese or English.
• Business-level written communication skills in English.

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Preferred Skills & Experience

• JVM application tuning and monitoring.
• Development experience with Kotlin.
• Experience in coaching, management, and/or technical team leadership.
• Kubernetes-based application development.

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Development Environment

• Product & Service Development: Kotlin, Ktor
• Observability: Prometheus, Grafana, OpenSearch
• Storage: MySQL
• Infrastructure: Kubernetes, VMs/PMs on private cloud
• Infrastructure as Code/CI/CD: ArgoCD, GitHub Actions

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Salary

• Expected Annual Salary: JPY 9,000,000 - JPY 14,000,000

• Form: Monthly salary (including fixed overtime allowance)

• Standard Monthly Salary: JPY 600,000 - JPY 932,000

  • Base salary: JPY 465,000 - JPY 725,000
  • Fixed overtime allowance: JPY 134,000 - JPY 208,000
    (Fixed overtime allowance covers 35 hours; additional allowance paid for overtime beyond 35 hours)

• Bonuses: Up to twice a year, based on company and department performance

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Allowances

• Overtime allowance
• Commuting allowance (max JPY 150,000/month; paid for actual days in office)
• Working style allowance for remote work improvement (JPY 11,000/month)

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Type of Employment

• Permanent employee (no fixed period, 3-month trial period).

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Work Location

• Hakata Office, Fukuoka (wheelchair accessible)
• Office assignment may change per business needs.
• Indoor smoking prohibited, designated smoking rooms available.

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Work Hours

• Flextime system (standard work hours: 7 hours 45 minutes; no core hours).
• Standard working hours: 9:30 a.m. - 6:15 p.m.
• Shortened working hours available for childcare and caregiving.

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Holidays & Leave

• Two days off per week (Saturdays, Sundays)*
• National holidays, New Year's holiday (Dec 29 - Jan 4)
• Paid leave, special paid leave (condolence, maternity, sick childcare, nursing care, infectious disease, etc.)
• Happy Friday (public holidays falling on Saturday: previous business day off)
• Sabbatical leave

*May differ by department.

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Benefits

• Comprehensive social insurance
• Defined Contribution Pension Plan (optional)
• Welfare Group Term Insurance, Long-term Disability coverage
• Employee Savings & Stock Investment Programs
• Health checkup subsidies, in-house massage room
• Club activities, social event subsidies, and more

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Talent Development & Support

• Training for employees
• Language courses
• Management training
• Sabbatical leave
• Doctoral Studies Support Program
• Internal job challenge opportunities

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Selection Process

1. Application
2. Coding test/Assignment
3. Interviews/Background Check
4. Offer

• Document screening results communicated within two weeks.
• Applicants may undergo multiple interviews, technical/aptitude tests, compliance/reference checks.
• Internal offer typically within 4–6 weeks if process proceeds smoothly.
• No feedback on criteria or reasons for selection outcome will be provided.

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*Note: Removed company-specific details and application submission instructions per your request.*