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L3 IT Infrastructure Engineer (Servers & Network)

Minato-ku, Tokyo

As an L3 Infrastructure Support Engineer you will be the go-to person for resolving complex issues related to both server and network infrastructure that go beyond the scope of L2 support.

This role requires a deep understanding of network and server technologies, and most importantly, ability and willingness to take ownership of managing/maintaining the IT infrastructure and contribute to the team's growth.

The Opportunity:

The L3 Infra Engineer will be dedicated to supporting the internal corporate infrastructure of a global Marketing Consulting company. They are now in a very exciting phase in the growth of their business as they become increasingly more independent from their overseas parent company. For the IT Infra Engineer, this presents a fantastic opportunity to make a greater impact, as Japan will have greater control of their local technology decisions.


Server Support:
  • Design, implement, and maintain on-premises and/or cloud-based server infrastructure.

  • Diagnose and troubleshoot complex server issues, including performance bottlenecks, hardware failures, software conflicts, and security vulnerabilities.

  • Implement and maintain server configurations, including operating systems (Windows, Linux), virtualization technologies (VMware, Hyper-V).

  • Implement and maintain server security best practices, including user access control, firewalls, and intrusion detection systems.

  • Automate server tasks and processes to improve efficiency and reliability.

  • Perform regular backups and ensure disaster recovery plans are in place.

  • Monitor server performance and proactively identify potential problems.

  • Stay up-to-date on the latest server technologies and trends.

  • Work collaboratively with other IT team members and stakeholders.

Network Support:

  • Diagnose and troubleshoot network issues escalated from L2 or L1, including connectivity problems, routing errors, security breaches, and performance issues.

  • Implement and maintain network configurations, including network devices (routers, switches, firewalls), network protocols (TCP/IP), and security mechanisms.

  • Monitor network performance and identify potential problems.

  • Design and implement network upgrades and expansions.

  • Stay up-to-date on the latest network technologies and trends.

  • Work collaboratively with other IT team members and stakeholders.

Additional Responsibilities:

  • Document solutions and procedures for future reference.

  • Provide technical support to internal users and troubleshoot their IT issues.

  • Serve as a liaison between upper management, users, and engineers; raise the visibility of critical issues and ensure that all relevant parties are informed.

  • Collaborate effectively with other IT team members and stakeholders.



Technical Background

  • 6+ years of experience as an L3 Support Engineer or similar role, with demonstrated expertise in both server and network administration.
  • In-depth knowledge of networking concepts, protocols, and troubleshooting methodologies.

  • Strong understanding of server administration, including operating systems, virtualization technologies, and server applications.

  • Experience with scripting languages (e.g., Python, PowerShell) a plus.

  • Experience with cloud platforms (AWS, Azure) is a plus.

  • Demonstrated proficiency in IT documentation and knowledge management practices.

Soft Skills:

  • Japanese and English language skills to perform the role effectively within a bilingual context.

  • Excellent communication, interpersonal, and problem-solving skills.

  • Ability to work independently and collaboratively in a team environment

  • Strong analytical and critical thinking skills.

  • A positive attitude and willingness to learn new technologies.

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