Senior Network Leader: Cloud & Hybrid Multi-Site Infra

twentyAI; New York (NY); Hybrid; USD 130,000 - 170,000; Full time

Job summary

twentyAI is seeking an experienced Network Manager to lead network operations and infrastructure across a multi-site business with a complex hybrid and cloud environment. You will manage a team of three Network Administrators and own network performance, security and availability while delivering upgrades across multiple locations.

The role combines hands-on infrastructure expertise with leadership, project delivery and continuous improvement.

Qualifications

• 7–10 years of relevant experience in network engineering, infrastructure or equivalent practical experience.
• Strong knowledge of enterprise networking, routing protocols, network security and connectivity.
• Hands-on experience with Cisco switches, routers and firewalls; CCNA-level knowledge or equivalent experience.
• Experience configuring and supporting LAN and SD-WAN environments.
• Strong understanding of cloud networking across platforms such as Microsoft Azure and OCI.
• Experience with virtual networks, subnets, routing, peering, cloud firewalls and hybrid connectivity.
• Knowledge of dedicated cloud connectivity, including Azure ExpressRoute and OCI FastConnect.
• Administration experience with Windows Server, Active Directory and desktop environments.
• Familiarity with Microsoft Entra ID and identity integration across on-premises and cloud environments.
• Experience managing technical projects, infrastructure resources and external vendors.
• Strong communication, documentation and problem-solving skills, with the ability to work effectively with technical and non-technical stakeholders.
• Experience with incident management, ITIL processes and production environments.
• Cisco CCNP or equivalent professional-level networking certification.
• Experience with cloud infrastructure and platform-as-a-service environments.
• Familiarity with email, collaboration and Microsoft 365 technologies.
• Experience with out-of-band management and cellular connectivity solutions.
• Exposure to operational and capital expenditure budgets.
• Experience supporting multi-site organisations with hybrid, hosted and co-location infrastructure.

Responsibilities

• Lead and develop a team of three Network Administrators, overseeing workload allocation, performance and professional development.
• Manage and maintain enterprise network infrastructure, including routers, switches, firewalls, LAN, SD-WAN and connectivity.
• Own cloud networking across hyperscaler environments, including virtual networks, routing, segmentation, security policies and hybrid connectivity.
• Support and deliver infrastructure projects, including technology refreshes, site relocations and network upgrades.
• Monitor and optimise network performance, availability, scalability and resilience.
• Identify and resolve vulnerabilities, support security audits and maintain intrusion detection and prevention capabilities.
• Lead disaster recovery and business continuity testing, ensuring network resilience and minimising single points of failure.
• Manage relationships with technology vendors, telecom carriers and external service providers.
• Maintain accurate network documentation, connectivity diagrams, infrastructure inventories and vendor records.
• Work closely with IT leadership and cross-functional teams on incident management, troubleshooting and service improvements.
• Support infrastructure across multiple offices, data centres, co-location facilities and hosted environments.
• Participate in an after-hours on-call rotation and occasional domestic travel as required.

Skills

Enterprise networking

Routing protocols

Network security

Cisco switches

Cisco routers

CCNA knowledge

LAN and SD-WAN

Azure cloud networking

OCI cloud networking

ExpressRoute

Entra ID

Windows Server

Active Directory

Microsoft 365

ITIL processes

Incident management

Vendor management

Team leadership

Job description

twentyAI is seeking an experienced Network Manager to lead network operations and infrastructure across a multi-site business with a complex hybrid and cloud environment. You will manage a team of three Network Administrators and own network performance, security and availability while delivering upgrades across multiple locations.

The role combines hands-on infrastructure expertise with leadership, project delivery and continuous improvement.