Infrastructure Engineer

About Legence

Legence () (Nasdaq: LGN) is a leading provider of engineering, consulting, installation, and maintenance services for mission-critical systems in buildings. The company specializes in designing, fabricating, and installing complex HVAC, process piping, and other mechanical, electrical, and plumbing (MEP) systems—enhancing energy efficiency, reliability, and sustainability in new and existing facilities. Legence also delivers long-term performance through strategic upgrades and holistic solutions.

Serving some of the world’s most technically demanding sectors, Legence counts over 60% of the Nasdaq-100 Index among its clients.

The IT Infrastructure Engineer is responsible for designing, implementing, maintaining, and supporting core enterprise infrastructure services across on‑premises and cloud environments. This role ensures high availability, security, and performance of critical systems while partnering closely with cross‑functional IT and business teams.

• Network & Systems Engineering
• Design, implement, and support network infrastructure with strong understanding of Layer 2 and Layer 3 networking concepts, routing, switching, VLANs, ACLs, and wireless technologies.
• Configure, manage, and optimize multi‑vendor switches, wireless access points, routers, and firewalls.
• Administer and support Windows Server, Active Directory, and related identity services.
• Support cloud services (Azure preferred), including IaaS, PaaS, identity, automation, and monitoring capabilities.
• Operational Support & Troubleshooting
• Diagnose and resolve infrastructure issues across network, server, cloud, and authentication platforms to minimize downtime.
• Provide escalation support to help desk, applications, and other technical teams.
• Participate in root‑cause analysis and implement corrective or preventive measures.
• Performance, Monitoring & Documentation
• Monitor network and system performance, identify bottlenecks, and implement improvements.
• Maintain accurate infrastructure documentation (configs, diagrams, runbooks, IP subnets, change histories).
• Security & Compliance
• Implement and maintain security controls, including firewalls, VLAN segmentation, ACLs, and secure configuration standards.
• Ensure solutions comply with enterprise standards and applicable regulations.
• Project Work & Collaboration
• Work on infrastructure projects such as cloud migrations, system upgrades, network redesigns, and technology deployments.
• Collaborate with other IT teams, business partners, and external vendors to deliver effective infrastructure solutions.

• Bachelor’s degree in Computer Science, Information Technology, or equivalent experience.
• 5–10 years experience in enterprise infrastructure roles covering networking, Windows systems, and/or cloud platforms.
• Experience with multi‑vendor firewalls, switches, wireless, IPv4, routing protocols, NAT, VPNs, VLANs, etc.
• Experience with Azure or other cloud platforms.

• Experience with SaaS infrastructure platforms and SSO/identity solutions.
• Strong analytical, documentation, and communication skills.
• Ability to work independently, adapt quickly, and manage priorities in a dynamic environment.

• Strong problem‑solving mindset and ability to work under pressure.
• Team‑oriented collaborator with ability to influence without direct authority.
• Customer‑focused, organized, detail‑oriented, and proactive in learning new technologies.

401(k) Plan with Company Match: Currently match contributions dollar‑for‑dollar up to 4% of eligible pay; immediate vesting.

Health & Welfare Benefits: Employer provided medical, dental, vision, prescription drug, Employee Assistance Program and accident & illness coverage.

Life and Disability Insurance :
Employer provided basic life insurance and AD&D valued at 50K coverage amount with the option for voluntary buy up for additional coverage.

Time Off: Flexible non‑accrual vacation; company holidays per policy. (For California employees, this is separate from California paid sick leave, if applicable.)

Expenses :
Business travel and related expenses reimbursed per company…