Senior Network Administrator Job at Robert Half (Jacksonville)

Senior Network Administrator

We are looking for an experienced Senior Network Administrator to oversee and ma...

Location

United States , Salem

Salary:

95000.00 - 105000.00 USD / Year

Robert Half

Expiration Date

Until further notice

Requirements

Minimum of 5+ years of experience in network administration or a related field
Must know the Cisco ecosystem, Cisco routers switches and networking solutions
Palo Alto and Fortinet firewalls are a plus
Solid understanding of networking principles and best practices
Ability to Lead a team of 2 to solve complex technical issues
Strong analytical and problem-solving skills with attention to detail
Legally authorized to work in the United States

Job Responsibility

Manage and optimize local and wide area network infrastructure, including servers, routers, switches, firewalls, and wireless devices
Ensure the security and functionality of network systems through regular monitoring and updates
Coordinate and execute installations of interconnected systems, such as internet connections and host computer networks
Implement and maintain firewall technologies to protect sensitive data and prevent unauthorized access
Troubleshoot network issues promptly to minimize downtime and maintain operational efficiency
Collaborate with team members to design and deploy network solutions that align with organizational needs
Perform routine maintenance and upgrades to ensure network components are operating at peak performance
Support Active Directory management, including user accounts and permissions
Document network configurations and procedures for future reference and training purposes
Stay updated on emerging networking technologies to continuously improve system capabilities

What we offer

Access to top jobs
Competitive compensation
Benefits including medical, vision, dental, and life and disability insurance
401(k) plan enrollment
Free online training

Fulltime

System and Network Administrator N3

Are you a Level 3 IT Technician or experienced Systems Administrator (MSP), read...

Location

Canada , Brossard

Salary:

Not provided

Randstad

Expiration Date

February 17, 2026

Requirements

5 years minimum experience as a senior IT technician in a Microsoft environment
DEC in IT or equivalent experience
In-depth knowledge of M365
Advanced knowledge of Azure solutions
Knowledge of Windows server, Exchange, VMware, Veeam, Active Directory, GPO
Networking knowledge (firewall, VLAN, DNS, DHCP)

Job Responsibility

Diagnose and resolve the most complex infrastructure problems affecting our clients
Master a wide range of technologies to ensure system stability, performance, and security
Actively participate in virtualization, cloud migration (Microsoft 365, Azure), and infrastructure redesign projects
Act as a proactive troubleshooter, take the initiative, and develop sustainable solutions to prevent recurring issues

What we offer

Competitive salary
Group Insurance
RRSP
3 weeks of vacation
Free parking
Continuing training with employer contribution

Senior Network Administrator/Engineer

This position is for a Network Administrator focused on the implementation and s...

Location

United States , Radford

Salary:

Not provided

E9 Corporation

Expiration Date

Until further notice

Requirements

DOD Secret (Fully Adjudicated) clearance as a minimum
Systems Engineer – Senior: Masters +10yrs, or Bachelors +12rs
Systems Engineer – Intermediate: Bachelors +5yrs or Associates +7yrs
A minimum of 5 years of experience performing the specified functions
CompTIA Security+
Computing Environment (CE) Certification Professional Level or higher (i.e., Cisco CCNP, Cisco CCNP Datacenter, Juniper, Palo Alto, F5 etc.)
5+ years of Network Administration
Documented experience with Cisco ACI and the Nexus 9k line
5+ years of configuring and maintaining switches, routers, firewalls, load balancers and network management tools
Experience with network management, analysis and troubleshooting tools

Job Responsibility

Implementation and sustainment of both NIPR and SIPR switches, routers, firewalls, load balancers and network management tools
Focus on a Cisco ACI datacenter environment
Network management/analysis/troubleshooting
Developing and maintaining local operating procedures and policies
Monitoring the ongoing operation of the network

Senior System Administrator

At Centrico, we bring innovation to the banking and fintech world with our open ...

Location

Italy , Biella

Salary:

Not provided

Centrico

Expiration Date

Until further notice

Requirements

Bachelor’s Degree in Informatics
Excellent diagnostic and problem solving skills
Curiosity, innovative spirit and always willing to stay up-to-date
Teamwork skills and ability to build strong inter-personal relationships
Good work organization skills and compliance with deadlines
Fluent English required
Excellent knowledge of load balancers - F5 Networks preferred
Excellent knowledge of Checkpoint technology, Fortinet firewalls
Strong skills in Cloud and Hybrid Cloud environments (Microsoft AZURE preferred)
Excellent knowledge of L2 and L3 switches

Job Responsibility

Management of the Group Network infrastructure (balancers, firewalls, switches, AS, etc ...)
Coordination of ordinary and extraordinary activities of the tlc carrier for the Group WAN
Management of the Group WAN infrastructure (routers, switches, Wi Fi, etc ...)
Design and management of Cloud and Hybrid Cloud environments
IT Operations architectures definition and setting

Senior System Administrator

At Centrico, we bring innovation to the banking and fintech world with our open ...

Location

Italy , Biella

Salary:

Not provided

Centrico

Expiration Date

Until further notice

Requirements

Bachelor’s Degree in Informatics
Excellent diagnostic and problem solving skills
Curiosity, innovative spirit and always willing to stay up-to-date
Teamwork skills and ability to build strong inter-personal relationships
Good work organization skills and compliance with deadlines
Fluent English required
Excellent knowledge of load balancers - F5 Networks preferred
Excellent knowledge of Checkpoint technology, Fortinet firewalls
Strong skills in Cloud and Hybrid Cloud environments (Microsoft AZURE preferred)
Excellent knowledge of L2 and L3 switches

Job Responsibility

Management of the Group Network infrastructure (balancers, firewalls, switches, AS, etc ...)
Coordination of ordinary and extraordinary activities of the tlc carrier for the Group WAN
Management of the Group WAN infrastructure (routers, switches, Wi Fi, etc ...)
Design and management of Cloud and Hybrid Cloud environments
IT Operations architectures definition and setting

Network Administrator

As a Network Administrator, you'll be tasked with providing technical support fo...

Location

United States , Washington, District of Columbia

Salary:

Not provided

Robert Half

Expiration Date

Until further notice

Requirements

Bachelor’s degree in Computer Science, Information Technology, Network Engineering, or a related field
equivalent certifications or experience may be accepted in place of a degree
1–2 years of experience in network administration or IT support, with hands-on exposure to network monitoring tools and technologies
basic experience with network monitoring tools such as Nagios and Splunk
familiarity with Cisco Prime for device monitoring and management
understanding of Cisco Identity Services Engine (ISE) for network access control and security policies
strong knowledge of network protocols (e.g., TCP/IP, DNS, DHCP, SNMP, HTTP)
solid understanding of network security tools and best practices
ability to diagnose and troubleshoot basic network issues, escalating complex problems to senior engineers as required
excellent verbal and written communication skills, with the ability to collaborate across IT teams and create detailed documentation

Job Responsibility

Monitor the performance and availability of network devices using tools such as Nagios and Splunk
respond to network alerts, investigate issues, and escalate them to senior engineers for resolution as necessary
troubleshoot network connectivity and device performance issues to ensure prompt resolution
support the administration of Cisco Prime for device monitoring and management
assist in configuring and maintaining network device settings using Cisco Prime
generate performance reports and device health summaries using Cisco Prime tools
help configure and maintain Cisco Identity Services Engine (ISE) for network access control, security policies, and guest-management settings
support the enforcement of network security segmentation and policies to ensure a safe operating environment
perform basic network security tasks like firmware upgrades, patch management, and configuration backups
document network configurations, infrastructure changes, and troubleshooting steps for internal record-keeping

What we offer

Medical insurance
vision insurance
dental insurance
life and disability insurance
eligibility to enroll in company 401(k) plan
free online training

Fulltime

Senior System Administrator

As a Senior System Administrator at Exor International, you will manage, maintai...

Location

Italy , San Giovanni Lupatoto

Salary:

Not provided

EXOR International

Expiration Date

Until further notice

Requirements

Proven experience (5+ years) as a system administrator or in similar roles
Strong knowledge of Windows Server operating systems in hyperconverged server farm environments (Nutanix) and virtualization platforms (VMware)
Experience with monitoring tools (PRTG)
Good understanding of network protocols, DNS, DHCP, TCP/IP
Knowledge of Microsoft authentication services (AD and Entra ID)
Experience with Sophos Firewall, End Point Security, and VPN
Familiarity with mail relay servers (Libra Esva) and email management using Exchange Online
Ability to work independently and manage complex projects
Good written and spoken English
Willingness to travel occasionally to company locations

Job Responsibility

Manage and monitor physical and virtual servers (Windows/Linux)
Administer cloud environments (Azure)
Configure and maintain networks, firewalls, VPNs, and security systems
Automate processes using scripting (e.g., Bash, PowerShell) with MDM and EDB (Baramundi)
Oversee backups (Veeam) and disaster recovery (Nutanix asynchronous replication)
Provide second- and third-level technical support
Manage vulnerability assessments and implement remediations
Maintain technical documentation and update IT policies

Fulltime

IT Systems, Network, & Security Administrator

We’re seeking a IT Systems, Network, & Security Administrator for a project-base...

Location

United States , Los Angeles

Salary:

Not provided

Tech Holding

Expiration Date

Until further notice

Requirements

Bachelor’s degree from an accredited university in Business, Technology, or a related field required
At least 3 years of experience in an IT Systems Admin, Security Admin, or Senior IT Support role
Prior experience with cloud-based email security software, preferably Mimecast
Experience with mobile device management (MDM), preferably Microsoft Intune and/or Kandji
Strong knowledge of Microsoft 365 administration and Entra ID
Prior experience troubleshooting identity, access, and MFA-related issues
Solid understanding of email security concepts such as phishing, spoofing, DMARC, DKIM, and SPF
Comfortable supporting a mixed Windows and macOS environment
Ability to work in an unstructured, fast-paced environment while making sound judgment calls in security and user access scenarios
Must have a valid driver’s license and a reliable and fully insured vehicle as this role will be traveling throughout Los Angeles to support staff at LAFC Headquarters, BMO Stadium, and the LAFC Performance Center at California State University – Los Angeles

Job Responsibility

Administer and support the organization’s cloud-based email security platform, Mimecast, for issues relating to threat investigation, message tracing, and policy management
Monitor and respond to phishing, spoofing, and impersonation attempts
Perform physical network troubleshooting, including identifying cabling faults, checking patch panels, validating link lights, and ensuring proper switch/AP connectivity
Support the organization’s cloud-based identity and access management platform, Okta, day-to-day operations regarding user access, SSO access to internal and SaaS applications, and multi-factor authorization (MFA) issue resolution
Manage and monitor the organization's mobile device management (MDM) platforms, Microsoft Intune and Kandji, troubleshooting MDM enrollment issues, profile errors, and missing agents
Provide support and troubleshoot device compliance, deployment, and access issues for Windows and macOS devices
Oversee user account management in Microsoft 365, Entra ID, and Active Directory
Support employee onboarding and offboarding, including user provisioning, device setup, and access changes
Provide Tier 1–3 helpdesk support, including MFA, password resets, access issues, and escalation handling
Review and triage security alerts in Microsoft Defender and Entra ID

Senior Network Administrator

Robert Half

Location:
United States , Jacksonville

Category:
IT - Administration

Contract Type:
Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Nice to have:

Additional Information:

Job Posted:
January 12, 2026

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