Results for Network Security Administrator Jobs in San Mateo, CA

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Network & Systems Administrator

Santa Cruz, CA
onsite
Temporary to Hire
47.5 - 55 USD / Hourly
We are looking for a skilled Network & Systems Administrator to support and strengthen a hybrid IT environment in California. This contract opportunity with potential for a permanent role is ideal for someone who combines strong systems administration expertise with hands-on network support and end-user troubleshooting. The role will focus on maintaining core infrastructure, improving platform reliability, and helping advance security-focused initiatives across the organization. Responsibilities: • Administer and support Windows-based server environments, ensuring stable performance, availability, and timely issue resolution. • Manage identity and access services through Active Directory and Entra, including user administration, permissions, and policy enforcement. • Provide support for endpoint management tools such as Intune to maintain device compliance, configuration, and deployment standards. • Oversee Microsoft 365 administration and assist with SharePoint organization, maintenance, and content cleanup efforts. • Troubleshoot and support core network components, helping maintain connectivity, performance, and dependable daily operations. • Deliver desktop and user support for Windows 10 environments, resolving hardware, software, and access-related issues. • Maintain and support infrastructure involving Dell technologies and Citrix platforms where needed across the environment. • Contribute to cybersecurity implementation efforts by assisting with compliance measures, security controls, and operational best practices.
2026-10-12T00:00:00Z

Security Network Engineer

San Jose, CA
onsite
Temporary / Contract
60 - 70 USD / Hourly
We are looking for an experienced Security Network Engineer to support and strengthen a data center environment in California. This long-term contract opportunity is ideal for a senior specialist who brings deep expertise in secure network operations, infrastructure monitoring, and enterprise firewall administration. The role focuses on maintaining a reliable, high-performing network across a smaller infrastructure footprint while partnering with teams that operate during Pacific Time hours. Responsibilities: • Manage and optimize secure network infrastructure across data center switching, routing, and firewall platforms. • Administer firewall environments and centralized policy management tools to maintain strong security controls and network availability. • Monitor network performance and security events, identify issues proactively, and drive timely resolution of incidents. • Support day-to-day operations for a compact but critical infrastructure environment with a focus on stability and efficiency. • Implement configuration changes, upgrades, and troubleshooting activities across core networking components. • Use network monitoring platforms such as SolarWinds to track health, capacity, and performance trends. • Contribute technical expertise on Cisco-based environments, including Nexus platforms where applicable. • Collaborate with internal stakeholders and remote teams to ensure dependable support coverage during Pacific Time business hours.
2026-09-21T00:00:00Z

Network/Systems Manager

Livermore, CA
onsite
Temporary to Hire
65 - 70 USD / Hourly
We are looking for an experienced Network/Systems Manager to join our team in Livermore, California. This is Network/Systems Manager a Contract-to-Permanent position offering an opportunity to lead and oversee critical network operations while collaborating with management and technical teams. The ideal Network/Systems Manager will take ownership of network systems, provide strategic recommendations for improvements, and ensure seamless technology operations across multiple sites. This is an onsite position sitting in Livermore, Ca. The ideal Network/Systems Manager will have Palo Alto firewall experience, strong Cisco networking skills, and a background in Active Directory, VMware, and Google Workspace. The Network/Systems Manager will also help manage security in collaboration with our managed security provider, including patch management, configurations, and oversight of new firewall deployment. Experience with Cisco VoIP systems—particularly in design and configuration—is preferred. When the current manager is out, this Network/Systems Manager role will act as the primary liaison to upper management, requiring excellent communication skills and the ability to present clearly to executives. You will also be the go-to person for staff when issues arise, ensuring problems are addressed quickly and effectively. Responsibilities:•Key Responsibilities<ul><li>Oversee the network and virtual server environments, ensuring reliable and secure operations across all sites.</li><li>Administer LAN/WAN infrastructure including Cisco network equipment, virtualization platforms (VMware), Active Directory, user accounts, and network services.</li><li>Manage and configure firewalls (Palo Alto) and coordinate with security providers for patching, monitoring, and threat mitigation.</li><li>Oversee deployment of new network and security hardware, including upcoming firewall projects.</li><li>Configure and support Cisco VoIP systems, including design and implementation.</li><li>Troubleshoot and resolve hardware, software, and network issues to minimize downtime.</li><li>Evaluate requests for technical assistance, determine appropriate actions, and assign resources accordingly.</li><li>Collaborate with leadership to plan short- and long-term technology upgrades, replacements, and system improvements.</li><li>Design and optimize network architectures (e.g., VLAN, VPN, routing, content filtering, QoS, IDS/IPS, etc.) for high performance and security.</li><li>Install and update network software, service packs, and security patches across multiple platforms.</li><li>Monitor servers, appliances, and network devices to ensure proper performance and availability.</li><li>Lead technology projects, including migrations, new implementations, and product evaluations, ensuring they meet deadlines and quality standards.</li><li>Coordinate with internal teams, vendors, and contractors to complete projects and resolve issues efficiently.</li><li>Prepare documentation including network maps, technical reports, procedures, and recommendations for improvements.</li><li>Stay informed on industry trends, tools, and best practices to inform purchasing and operational strategies.</li><li>Act as a primary contact for management, providing updates, reports, and recommendations.</li></ul>
2026-10-08T00:00:00Z

Systems Administrator

Santa Cruz, CA
onsite
Temporary / Contract
47.5 - 55 USD / Hourly
We are looking for an experienced Desktop Support to provide hands-on technical support in Santa Cruz, California. This Contract position focuses on endpoint administration, user support, and systems management across a primarily onsite environment. The ideal candidate will bring strong expertise in Microsoft and Apple device support, directory services, and enterprise infrastructure tools while ensuring reliable day-to-day operations. Responsibilities:• Deliver onsite support for Windows and Mac devices, including setup, troubleshooting, and ongoing administrative assistance.• Manage device enrollment and policy application through Intune to maintain secure and consistent endpoint configurations.• Administer Active Directory and Windows Server environments, supporting user accounts, access controls, and system stability.• Assist with domain alignment activities, including UPN updates and device or user enrollment into the appropriate environment when required.• Support Microsoft Windows 10 endpoints by resolving operating system, configuration, and performance issues.• Maintain and troubleshoot Dell hardware used across the organization, coordinating repairs or replacements as needed.• Provide support for Citrix-based access and desktop solutions to help users remain productive.• Collaborate with local staff and technical teams to resolve infrastructure and endpoint issues for an environment serving approximately 225 users.
2026-10-12T00:00:00Z

Systems Administrator

Martinez, CA
onsite
Temporary to Hire
45 - 60 USD / Hourly
Robert Half is looking for a Systems Administrator to support and maintain a complex enterprise technology environment in California. This Systems Administrator opportunity is ideal for a hands-on technical professional with strong experience in Windows Server, VMware, Active Directory, networking, and infrastructure support. The Systems Administrator will be responsible for maintaining critical systems, troubleshooting escalated technical issues, supporting infrastructure projects, and improving the reliability, performance, and security of enterprise technology. This position requires someone who can work independently, collaborate with senior technical staff, and provide exceptional support to end users. This Systems Administrator Role is an onsite position out of Martinez, Ca and has the potential to go fulltime. Responsibilities:<ul><li>Administer, configure, and maintain enterprise infrastructure, including Windows servers, VMware virtual environments, Active Directory, networks, VPNs, firewalls, and storage systems.</li><li>Support the installation, configuration, testing, maintenance, and troubleshooting of physical and virtual servers, network devices, and enterprise applications.</li><li>Manage Windows Server environments, including Active Directory, Group Policy, DNS, DHCP, file services, and user account administration.</li><li>Support VMware virtualization technologies, including vCenter, vSphere, vMotion, and virtual machine management.</li><li>Troubleshoot complex hardware, software, network connectivity, application access, and system performance issues.</li><li>Perform routine infrastructure maintenance, including system backups, patch management, operating system upgrades, security updates, and performance optimization.</li><li>Monitor infrastructure health, network security, and system availability while identifying and resolving potential issues.</li><li>Administer Microsoft 365, Exchange, and related cloud-based services to support enterprise communications and collaboration.</li><li>Support network infrastructure, including LAN/WAN environments, switches, routers, wireless connectivity, firewalls, and VoIP systems.</li><li>Assist with storage administration, disaster recovery processes, data protection, and system restoration activities.</li><li>Utilize PowerShell and other scripting tools to automate administrative tasks and improve operational efficiency.</li><li>Serve as a second-level escalation resource for technical support issues involving servers, networks, applications, and end-user systems.</li><li>Collaborate with internal teams, technical leadership, and external vendors on infrastructure improvements and technology implementations.</li><li>Develop and maintain technical documentation, system configurations, troubleshooting procedures, and operational guidelines.</li><li>Identify opportunities to improve infrastructure reliability, security, automation, and overall IT service delivery.</li></ul>
2026-10-14T00:00:00Z

Sr Network Engineer

Concord, CA
onsite
Permanent / Full Time
140000 - 150000 USD / Yearly
We are looking for an experienced Sr Network Engineer to support and strengthen a hybrid enterprise infrastructure in Concord, California. This role focuses on designing, optimizing, and securing network environments that enable dependable connectivity, protected data exchange, and stable day-to-day operations. The ideal candidate brings strong technical depth across cloud and on-premises platforms, a practical troubleshooting mindset, and the ability to communicate effectively with both technical and non-technical stakeholders. Responsibilities: • Design, maintain, and enhance network infrastructure across routing, switching, wireless connectivity, firewall platforms, VPN services, and hybrid Azure-integrated environments. • Develop and uphold network architecture standards, technical documentation, and long-term infrastructure plans that improve performance, segmentation, and security. • Administer and support a hybrid Microsoft ecosystem, including cloud and on-premises services, to ensure reliable access and operational continuity. • Manage the Hyper-V environment and related infrastructure components to maintain availability, scalability, and system efficiency. • Investigate and resolve complex network and connectivity issues, serving as an escalation point for advanced incidents and selected help desk matters. • Oversee backup operations for critical systems and verify that recovery processes align with business continuity needs. • Partner with IT leadership and security stakeholders to implement preventive safeguards and contribute to incident response efforts. • Provide technical guidance to end users and entry-level team members while promoting strong service standards and timely issue resolution. • Monitor industry developments, evaluate emerging technologies, and recommend improvements that strengthen the overall network environment. • Travel occasionally to support offices or operational needs as required.
2026-09-18T00:00:00Z

Systems/Infrastructure Engineer

Petaluma, CA
onsite
Permanent / Full Time
110000 - 135000 USD / Yearly
A growing private aviation services organization is seeking a Senior Systems / Infrastructure Engineer to support and secure its enterprise infrastructure, cloud platforms, and business-critical systems. This is a hands-on role responsible for administering Microsoft technologies, Azure cloud environments, virtualization platforms, networking, and security tools while driving infrastructure modernization and operational excellence.What You'll OwnMicrosoft 365, Azure administration and migrations, Active Directory, Entra ID, VMware/Hyper-V, infrastructure modernization, security tools, and identity management. Networking experience is important but serves as a supporting component of the role rather than the primary focus.Role FocusThis position is primarily centered on systems administration and infrastructure engineering, with significant responsibility for Azure administration, cloud implementations, migrations, and hybrid environments. You'll work across Microsoft technologies, virtualization, identity management, and security platforms while helping drive modernization initiatives throughout the organization. Security operations and network administration are important aspects of the role, but deep network architecture is not the primary focus.Key ResponsibilitiesInfrastructure & Cloud Administration<ul><li>Administer and support Microsoft 365, Entra ID (Azure AD), Active Directory, Windows Server, Group Policy, and hybrid cloud environments.</li><li>Lead and support Azure administration, implementation, migration, and optimization projects.</li><li>Design, deploy, and maintain Azure cloud services, hybrid identity solutions, and cloud-based infrastructure.</li><li>Manage VMware and Hyper-V environments, enterprise servers, storage, backups, and core infrastructure.</li><li>Implement patching, monitoring, system hardening, and infrastructure best practices.</li></ul>Network Administration<ul><li>Manage and troubleshoot enterprise LAN/WAN environments.</li><li>Support switches, routers, firewalls, VPNs, wireless infrastructure, and network segmentation.</li><li>Ensure high availability, performance, and reliability across on-premises and cloud environments.</li></ul>Security & Identity Management<ul><li>Administer Okta, MFA, identity governance, privileged access, and user lifecycle management.</li><li>Support SIEM, EDR, vulnerability management, endpoint security, IDS/IPS, and security monitoring platforms.</li><li>Perform vulnerability remediation, risk reduction, and security hardening initiatives.</li><li>Implement Zero Trust security principles and secure access controls.</li></ul>Incident Response & Compliance<ul><li>Participate in security incident response, investigation, root cause analysis, and remediation efforts.</li><li>Support compliance initiatives related to NIST, CIS, SOC 2, GDPR, and CCPA.</li><li>Maintain technical documentation, infrastructure diagrams, runbooks, and operational procedures.</li></ul>
2026-10-07T00:00:00Z

AI Engineer (AI Data Privacy, Security & Governance)

San Ramon, CA
remote
Permanent / Full Time
85000 - 124000 USD / Yearly
obert Half is seeking a Software Engineer II – AI Engineer to analyze, design, program, debug, test, implement, and support the privacy, security, and governance controls that protect generative AI technologies. This role safeguards GenAI-enabled applications, including LLM-powered workflows, RAG pipelines, plugins, skills, and autonomous agents, by embedding data protection, security guardrails, and responsible AI governance across the development lifecycle. This role supports SDLC documentation across all phases, with a focus on data privacy, security guardrails, governance, compliance, and risk management. It also works with users to define requirements and support applications in production. What You’ll Do <ul><li>Design and implement data privacy controls, including PII/PHI detection, redaction, and data minimization. </li><li>Build security guardrails, including prompt-injection defense, jailbreak prevention, and output filtering. </li><li>Establish governance for plugins, skills, and agents, including registration, approval, and lifecycle management. </li><li>Review and vet third-party plugins, skills, and agent tools for security, privacy, and compliance risks. </li><li>Define and enforce access controls, authentication, and least-privilege permissions for AI components. </li><li>Implement guardrails for autonomous agents, including action scoping, tool-use restrictions, and human-in-the-loop approval. </li><li>Apply data classification, retention, and residency policies across GenAI data flows. </li><li>Monitor AI systems for policy violations, data leakage, and anomalous plugin, skill, or agent behavior. </li><li>Maintain audit trails and logging for plugin, skill, and agent activity. </li><li>Support compliance with regulations and frameworks, including GDPR, CCPA, and the EU AI Act. </li><li>Provide Level II production support for security, privacy, and governance incidents. </li><li>Support incident response, including containment, escalation, and remediation. </li></ul>
2026-09-28T00:00:00Z

8 results for Network Security Administrator in San Mateo, CA