Senior Enterprise 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. Overview 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. Key Responsibilities 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. 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. Qualifications Required 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. Preferred 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. Soft Skills 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. Compensation: $130k-$148k, depending on experience #LI-JS1 #LI-Hybrid Benefits Overview 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 policy. Reasonable Accommodations If you need assistance or accommodations during the application or interview process, please contact us View email address on click.appcast.io or your dedicated recruiter with the job title and requisition number. Employment Eligibility Candidates must have current work authorization in the U.S.; visa sponsorship is not available for this position. Third-Party Recruiting Disclaimer Legence and its affiliates do not accept unsolicited resumes from agencies; any such submissions without a prior signed agreement authorized by Legence Holdings LLC's CHRO or Director of Talent Acquisition will not incur fees and are considered property of Legence. Pay Disclosure & Considerations Where pay ranges are indicated, please note that a successful candidate’s exact pay will be determined based relevant job -related factors, including any of the following: candidate’s experience, skills, and qualifications, as well as geographic and market considerations. We are committed to ensuring fair and competitive compensation for all employees and comply with all applicable salary transparency laws. Equal Employment Opportunity Employer Legence and its affiliate companies are proud to be an equal opportunity workplace. We are committed to equal employment opportunity regardless of race, color, religion, sex (including pregnancy, gender identity, and sexual orientation), marital or familial status, national origin, age, disability, genetic information (including family medical history), political affiliation, military service, other non-merit-based factors, and any other characteristic protected under applicable local, state or federal laws and regulations. EEO is the Law #J-18808-Ljbffr