Senior Infrastructure Engineer — Hybrid/Onsite

Prosum; Los Angeles (CA); Hybrid; USD 135,000 - 150,000; Full time

Benefits offered by this job

Hybrid work model

Job summary

Prosum seeks a Senior Systems Engineer in Los Angeles, CA, on a hybrid schedule after onboarding. You will maintain and optimize enterprise infrastructure across Windows, virtualization, networks, and security, ensuring high availability and resilience.

You will work across VMware, VxRail, storage, firewall management, PKI, and Active Directory while collaborating with security teams and service desks to resolve complex issues and drive modernization initiatives.

Qualifications

• 5+ years of experience in Systems Administration, Infrastructure Engineering, or Systems Engineering roles.
• Strong hands-on experience supporting enterprise infrastructure and networking environments.
• Scripting or automation experience using PowerShell, Python, SQL, or similar technologies.
• Experience with endpoint management and deployment platforms such as Intune, PDQ, or similar tools.
• Bachelor’s degree in Computer Science, Information Technology, Engineering, or equivalent professional experience.

Responsibilities

• Administer, maintain, and optimize enterprise infrastructure environments including virtualization, storage, and networking platforms.
• Deploy and support VMware, VxRail, and NAS/storage solutions.
• Design, configure, and troubleshoot Layer 2 and Layer 3 network infrastructure.
• Manage routing and switching technologies including BGP, OSPF, VLANs, spanning tree, static routing, and EtherChannel/LACP.
• Configure and maintain enterprise firewall environments including VPNs, NAT policies, and security rules.
• Troubleshoot WAN/LAN connectivity, fiber, routing, and network performance issues.
• Manage SSL/TLS certificates and support PKI/Certificate Authority administration.
• Partner with internal security teams on vulnerability remediation, segmentation, and infrastructure hardening initiatives.
• Administer Windows Server environments with focus on performance, resiliency, and high availability.
• Manage Active Directory, DNS, DHCP, Group Policy, and domain controller replication.
• Support clustering technologies for file services and SQL environments.
• Maintain Hybrid Exchange environments including mailbox administration and mail flow management.
• Implement and support patch management, endpoint deployment, and device management solutions.
• Lead backup, business continuity, and disaster recovery efforts using enterprise backup platforms.
• Support internal IT infrastructure including desktops, laptops, printers, telephony, and core enterprise services.
• Collaborate with service desk and infrastructure teams to resolve escalated technical issues and perform root cause analysis.
• Contribute to infrastructure documentation, operational standards, and process improvement initiatives.

Skills

Systems Administration

Infrastructure Engineering

Networking

Troubleshooting

Scripting & Automation

Active Directory

Windows Server

PKI & SSL/TLS

Backup & DR

Intune/Endpoint Deployment

Education

Bachelor’s degree in Computer Science / Information Technology / Engineering

Tools

VMware

VxRail

Palo Alto

Meraki

DNS

GPO

Intune

PDQ

Job description

Prosum seeks a Senior Systems Engineer in Los Angeles, CA, on a hybrid schedule after onboarding. You will maintain and optimize enterprise infrastructure across Windows, virtualization, networks, and security, ensuring high availability and resilience.

You will work across VMware, VxRail, storage, firewall management, PKI, and Active Directory while collaborating with security teams and service desks to resolve complex issues and drive modernization initiatives.