IT Infrastructure Manager

Date PostedJune 4, 2026LocationTokyo, Minato, JapanCompanyEIRE Systems K.K.SalaryJPY 6000K - JPY 8000KTypeit (hardware/network) - server and machine operation and maintenance it (hardware/network) - server architect and developer it (other) - in-house system operator

Job Summary

Reporting to the IT Architecture Manager, this role is responsible for the design, deployment, and support of business-critical IT infrastructure across the region. You will lead infrastructure projects, manage technical team members, and act as a regional escalation point for technical issues. The position requires a balance of hands-on support, vendor management, and strategic implementation of IT infrastructure solutions.

Responsibilities

  • Provide 2nd/3rd line infrastructure support
  • Lead infrastructure projects and BAU activities
  • Manage and develop technical team members
  • Manage vendors and third-party service providers
  • Support incident, problem, and change management

Required Skills

  • Networking (L2/L3, Firewalls, Wireless)
  • Windows Infrastructure (AD, DNS, DHCP)
  • VMware vSphere/ESX management
  • IT security best practices
  • Business level English and Japanese

Job Details

Role Overview: Reporting to the IT Architecture Manager, this role is responsible for the design, deployment, and support of business-critical IT infrastructure across the region. Key Responsibilities: • Provide 2nd/3rd line support for IT infrastructure • Lead infrastructure projects and BAU activities • Manage and develop technical team members • Act as a regional escalation point and subject matter expert • Support incident, problem, and change management processes • Contribute to infrastructure design and implementation • Manage vendors and third-party service providers • Maintain technical documentation and standards • Evaluate and introduce new technologies Working Hours: 09:00 - 18:00 Mon. - Fri. (Occasional requests for Saturday, Sunday and Public Holiday shift work may occur). Job Requirements: Essential: • Networking knowledge (L2/L3 switching, firewalls, wireless) • Experience managing Windows infrastructure (Active Directory, DHCP, DNS) • Strong understanding and implementation of IT security best practices • Experience managing VMware vSphere / ESX environments Desirable: • Experience with Azure public cloud environments • Experience with enterprise databases (SQL Server, Azure SQL Database) • Microsoft 365 / Azure AD administration • Scripting and automation (PowerShell, VBScript) • Previous team leadership or IT management experience • IT project management experience • Vendor management experience Language Requirements: • English Level: Business Conversation Level (TOEIC 735-860) • Japanese Level: Business Level (JLPT Level 2 or N2) Other Conditions: • Social Insurance • Commuting/Transportation Allowance • Education Training • Five-Day Workweek • Paid Holidays • Congratulatory or Condolence Leave • Child-care Leave • Sick Leave • Measures against passive smoking: No smoking indoors allowed