• Full-time

Publication date: 2026.07.22

System Engineer (Fully Remote & Flex & High Salary)

  • System Engineers / Infrastructure Engineers / Web Engineers / Game Developers
  • Tokyo
  • Salary 7,000,000 円 - 13,000,000円
【フルリモート・フルフレックス・高収入】システムエンジニア
職種Position System Engineers / Infrastructure Engineers / Web Engineers / Game Developers
会社概要Company profile We develop AI and mathematical optimization solutions that help customers apply cutting-edge technologies to real-world industrial operations.
Many organizations responsible for critical infrastructure face pressing challenges such as labor shortages, reliance on individual expertise, cost reduction, and CO₂ emissions reduction. By deeply understanding these challenges, we help our customers simulate multiple operational scenarios, visualize analytical insights, and make optimal operational decisions while reducing costs.
Major clients include:
• Electric utility companies
• Logistics companies
• Manufacturing companies
• Real estate developers (IoT)
仕事内容Job description As a core member of our Application Development team, you will lead the design and implementation of enterprise-grade applications.
This role goes beyond traditional software engineering. You will also participate in AI algorithm implementation and data analytics, allowing you to build a highly valuable skill set as both an Application Engineer and an AI Specialist.

Example Projects (Large-scale Social Infrastructure)
• Automated voyage planning system for large cargo vessels (major oil & shipping companies)
• Power generation optimization system (major electric utility companies)
• Highway traffic congestion prediction system (major highway operators)
• Demand forecasting and production planning system for large manufacturers
• Planning, design, and development of our SaaS platform, ReNom Apps

Responsibilities
Requirements Definition & Technology Selection
• Gather and analyze business requirements from customers
• Define functional requirements
• Evaluate and select the most appropriate technology stack
System Design
• Design logical and physical database architecture
• Design APIs and service endpoints
Development & Quality Assurance
• Develop scalable applications based on system design
• Ensure software quality through automated testing and best engineering practices
Project Management
• Manage development schedules
• Identify and resolve technical challenges
• Maintain high delivery quality across the development team
Product Development
• Define requirements and develop new features for our SaaS platform, ReNom Apps

Tech Stack
Languages
• TypeScript (React)
• Python
• SQL
Development Tools
• Microsoft VS Code
• Cursor
Infrastructure
• AWS
o ECS / ECR
o EC2
o RDS (MySQL / PostgreSQL)
応募資格Requirement Required
• Approximately 5+ years of professional web application development experience
• Strong understanding of the full software development lifecycle, from design through operation
• Experience developing and operating applications on cloud platforms such as AWS
• Experience with collaborative software development using Git, including code reviews
• Strong communication skills and the ability to work effectively with project managers, data scientists, and cross-functional teams

Preferred
• Experience leading engineering teams or managing project progress
• Experience coordinating tasks and maintaining stable project delivery
• Experience supporting technical decision-making and building team consensus
• Ability to communicate with clients and propose technical solutions
• Experience improving engineering quality through code reviews and technical mentorship
日本語力Japanese level Business
雇用形態Employment type Full-time
勤務エリアLocation Tokyo
勤務時間Working hours フルフレックス(ただし、22時〜朝5時の間は承認必要)
想定年収Salary 7,000,000 円 - 13,000,000円
条件・待遇Condition Annual Salary
JPY 7,000,000 – 13,000,000

Compensation will be determined based on experience, skills, and qualifications.

Compensation Structure

Annual salary consists of:

Monthly base salary × 12 months
Performance bonus (twice per year)

Monthly Fixed Salary
JPY 518,801 – 963,096

Breakdown:

Base Salary: JPY 389,777 – 723,612
Fixed Overtime Allowance: JPY 129,024 – 239,484

Includes 42 hours of fixed overtime per month.

Bonus

Performance-based bonus paid twice annually (February and August), with one month's base salary used as the standard benchmark.

Working Hours
Full Flex-Time Schedule
Work between 10:00 PM and 5:00 AM requires prior approval.
Employment Details
Probation Period: 6 months (no change in salary or benefits)
Annual Holidays: 120+ days
Fully paid weekends (Saturday & Sunday)
Japanese national holidays
Year-end/New Year holidays (December 29 – January 3)
Benefits
Social Insurance
Health Insurance
Employees' Pension Insurance
Employment Insurance
Workers' Compensation Insurance
Paid Leave
Annual Paid Leave
Refresh Leave (3 days)
Maternity Leave
Childcare Leave
Family Care Leave
Other special leave

FY2024 Childcare Leave Usage

Male Employees: 71%
Female Employees: 100%
Work Environment & Employee Benefits
Hybrid Work Style

Choose between working remotely or from the office depending on what enables your best performance.

Access to the Latest AI Technologies
Available to All Employees
Gemini
NotebookLM

Standard business licenses are provided to improve productivity across the company.

For Engineers

Business licenses for leading AI development tools are provided.

Choose freely from (multiple selections allowed):

Cursor
Claude Code
Codex
Devin

Tool selections can be changed monthly.
選考についてProcess 書類選考 > 一次面接 > 技術課題 > 最終面接 > 内定

※Githubなどがある方はご提出いただいております。
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