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Senior Network Engineer - Core Technologies Section, Corporate IT Infrastructure Department (CITID)

Tokyo, Japan💼 Full-time🗓 2026-08-10 → 2026-09-26

Core

Design, verify, construct, operate, and support global corporate network infrastructure, including Zero Trust networks, wired/wireless LAN, data centers, cloud networks, WAN, and remote access.

Role type

Senior Network Engineer (Core Technologies)

Builds

Global corporate network infrastructure, Zero Trust architecture, and secure connectivity solutions.

Domain

Enterprise IT Infrastructure / Network Engineering

Deliverable

production ML models | product features | dashboards & analysis | research | client delivery | infrastructure | physical/clinical work

Required skills

Core network routing (OSPF, BGP, VRF), Data Center and branch office switching, Zero Trust Network (ZScaler), Wireless LAN, NGFW Firewalls, Public cloud networking, SDWAN, Site-to-Site VPN, Network Authentication, AIOps, Network monitoring and logging, Network automation and orchestration

Preferred skills

Enterprise level network with 100+ locations, Zero Trust deployment experience, Network security depth (IDS, IPS, URL Filtering), Active Directory, Windows/MacOS/Linux, Project Management

Technologies

Cisco Catalyst, Nexus, HPE, ZScaler (ZIA, ZPA, ZCC, ZDX), Mist, Palo Alto, Fortigate, AWS, Azure, GCP, EdgeConnect, Fortinet, Cisco ISE, SNMP, Netflow, ADX

Responsibilities

Design, verification, construction, operation and user support for overall network infrastructure; Propose and engage in selection process for new technology/product/design; Work for various projects with domestic or global infrastructure team; Mentor junior engineers, share troubleshooting/design best practices, and lead technical initiatives; Develop and maintain network architecture documentation, standards, best practices, configurations, procedures and diagrams; Act as the SME for complex network incidents: perform root cause analysis, implement fixes and proactively address performance bottlenecks and capacity constraints; Drive the transition from manual configuration to Infrastructure-as-Code (IaC)

Seniority

Senior, hands-on IC with mentorship responsibilities

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