IT Infrastructure & Network Engineer

Overview

Design, implement, and support Cisco networks, Microsoft systems, and security solutions

Key Responsibilities

• patch management
• virtualization
• cisco networking
• microsoft 365
• network security
• windows server

Tasks

-Administer and maintain Patch Management Systems (PMS) for operating systems and applications. -Collaborate with senior engineers and security teams on infrastructure hardening and security policy enforcement. -Oversee virtualization environments (VMware, Hyper-V) including performance tuning and backup operations. -Design, configure, and manage Cisco network infrastructures (routing, switching, WAN/LAN, VPN). -Support Microsoft 365, Exchange Online, and Azure AD administration and migration projects. -Develop and maintain network and system documentation, topology diagrams, and configuration records. -Implement, manage, and support Network Access Control (NAC) systems for client environments. -Deploy, operate, and support Cisco and Fortinet firewalls, including rule management, VPN setup, and security monitoring. -Provide technical support and consulting to clients on infrastructure and network security improvements. -Provide advanced troubleshooting and escalation support for network and infrastructure incidents. -Conduct security audits, patch management, and compliance assessments. -Manage Windows Server environments (Active Directory, DNS, DHCP, GPO) and perform system maintenance.

Requirements

• cisco ccnp
• powershell
• python
• azure ad
• firewall
• vmware

What You Bring

We are seeking an experienced IT Infrastructure & Network Engineer to join our Managed Service Provider (MSP) team. This role focuses on the design, implementation, and support of Cisco-based network infrastructures, Microsoft systems, and security solutions including firewall, NAC, and PMS platforms. The ideal candidate will have hands-on experience managing enterprise-level infrastructure environments, with strong technical depth across both network operations and security management. You will play a key role in maintaining client environments, optimizing performance, and ensuring compliance with security best practices. -Professional experience in IT infrastructure and network engineering, preferably in an MSP or multi-client environment. -Scripting and automation experience (PowerShell, Python preferred). -Strong documentation and process-oriented mindset. -Strong analytical and diagnostic skills across complex, multi-client environments. -Microsoft infrastructure administration (Windows Server, Active Directory, Azure AD). -CompTIA Security+ or similar (a plus) -Korean-English Bilingual -Firewall deployment and management (Cisco ASA, Firepower, FortiGate). -Cisco CCNP (Required) -Advanced Cisco configuration (BGP, OSPF, VLANs, ACLs, VPNs). -Capable of working independently and mentoring junior engineers. -Microsoft Certified: Azure Administrator Associate or M365 Administrator (Preferred) -PMS (Patch Management System) operation, automation, and reporting. -Network monitoring tools (SolarWinds, N-central, PRTG, etc.). -Excellent communication and customer service abilities. -Sonicwall / Fortinet or equivalent firewall certification (Preferred) -Virtualization (VMware, Hyper-V) and backup management (Veeam, Datto). -Proactive in identifying and resolving performance and security issues.

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About Nexien Inc.

-The firm has rapidly grown into a nationwide tech services provider. -Its projects span managed services, security infrastructure, AV integration, and smart building automation. -Stronghold sectors include industrial, energy, infrastructure, and institutional facilities. -It operates as both a general and specialty contractor, providing hands-on project management and engineering expertise. -Unusual for a tech firm, it combines robotics and IoT with traditional construction roles on-site. -Its leadership team has successfully expanded the company from startup roots to a midsize organization with diverse, tech-driven engagements.

Sector Specialisms