IT Infrastructure Engineer Job Description

An IT Infrastructure Engineer owns the layer that every application, user account and data feed in an organization depends on. That layer spans physical and virtual pieces: racks of servers and storage in a data center or colocation cage, hypervisor clusters, campus and branch networks, firewalls at the internet edge, directory and identity services, backup systems, and the cloud subscriptions that now hang off the same identity and network design. The engineer decides how those pieces fit together, builds them, and keeps them supportable for their whole service life.

O*NET, the Labor Department's occupational database, files the title under computer systems engineers/architects, a profile that covers designing solutions to system administration issues and network concerns and performing systems management and integration. Its task list includes directing the installation of operating systems, network software and hardware, and monitoring system operation to detect potential problems. That mix of design and hands-on build is the job.

Build work

A typical project starts with a request: a new application needs a production and disaster recovery environment, a branch office is opening, or a storage array is reaching the end of its contract. The engineer sizes compute and storage, picks network segments and firewall rules, writes the Terraform or Ansible that builds it, and runs the change through review. Good infrastructure engineers build the second site and the restore test into the first design rather than adding them after an outage.

Run and lifecycle work

The other half of the week is keeping what already exists healthy. That means patch cycles for hypervisors, firmware and operating systems, capacity reviews, certificate renewals, and tuning alerts so the on-call engineer is woken only for real problems. When something breaks across layers, such as a storage latency spike that looks like an application bug, the infrastructure engineer is the person who can trace it through the network, the hypervisor and the array.

Lifecycle management is a core part of the role. CISA's Binding Operational Directive 26-02 says advanced threat actors run widespread exploitation campaigns against end-of-support edge devices and that agencies can remediate the risk through proven lifecycle management practices. For an infrastructure engineer, that translates into a maintained inventory of every firewall, router, switch and appliance with its vendor support date, and a replacement plan funded before the date arrives.

Where the job sits

Infrastructure engineers report into IT operations or a platform group, working beside security, network, database and application teams. In a large enterprise the role may be split by domain (compute, network, storage), while a mid-sized company may have two or three engineers covering everything from the core switch to the cloud tenant. Employers range from banks and insurers to hospitals, universities, manufacturers, government agencies and managed service providers that run infrastructure for clients.

Education. BLS lists a bachelor's degree as the typical entry-level education for Computer Occupations, All Other, the group that includes this title. Computer science, information systems, information technology and network engineering degrees are the common fields. As a rough guide, an associate degree or military technical training plus strong certifications and several years of hands-on work can substitute at employers that hire on demonstrated skill.

Experience. BLS lists no related work experience as typical for the catch-all group as a whole, but the infrastructure engineer title is a step up from operations work. As a rough guide, expect 3 to 5 years in help desk, systems administration, network administration or data center operations before taking the title. The useful experience is breadth: having rebuilt a failed RAID set, migrated a domain controller, cut over a firewall pair and restored a database from backup gives an engineer the cross-layer judgment the role needs.

Technical skills.

• Windows Server and Linux administration, including Active Directory, Group Policy, DNS and DHCP
• Virtualization platforms such as VMware vSphere, Microsoft Hyper-V or Nutanix AHV
• Routing and switching fundamentals, VLANs, firewall policy, VPNs and load balancing
• Storage concepts: SAN and NAS, replication, snapshots and backup software
• Infrastructure as code and scripting in Terraform, Ansible, PowerShell or Python, with Git for version control
• At least one public cloud platform's networking, identity and compute services
• Monitoring and logging tools, and the discipline to write runbooks other people can follow

Certifications. None is legally required, but credentials help show depth in a given stack. Common choices:

• Cisco CCNA (Cisco) for networking fundamentals
• Microsoft Certified: Azure Administrator Associate (Microsoft)
• AWS Certified Solutions Architect - Associate (Amazon Web Services)
• Red Hat Certified System Administrator, RHCSA (Red Hat)
• HashiCorp Certified: Terraform Associate (HashiCorp)
• CompTIA Security+ (CompTIA) for security fundamentals

Building proof. A home lab or a low-cost cloud sandbox is the cheapest way to practice the work before an employer trusts you with production. Build a small cluster, break it, restore it from backup, and keep the Terraform and Ansible code in a public repository with a short write-up of each design choice. That record answers interview questions better than a list of tools.

Working habits. Write change plans with a tested rollback, keep diagrams current, and say plainly when a design carries risk; those habits are what let a colleague review, approve and later support your work. Government and contractor positions may also require a background investigation or security clearance, which the employer sponsors.

BLS released its 2025-35 employment projections on Aug. 27, 2026. Computer Occupations, All Other, the group that contains O*NET's systems engineers/architects profile, is projected to grow 5.1% over the decade.

The neighboring occupations split. BLS projects employment of network and computer systems administrators to fall 4.1% from 2025 to 2035, while computer network architects grow 7.7%. Infrastructure engineers sit between those two groups in daily work. The projections describe whole occupations, not this title, but they are one reason to build skills on the design side of that line: architecture, automation and ownership of whole platforms.

Pay across settings

Within Computer Occupations, All Other, the May 2025 median wage was $126,880 in computer systems design and related services and $83,120 in educational services. Engineers weighing a move between a university IT department and a services firm should read those as figures for the whole catch-all group, since BLS does not report infrastructure engineers separately.

AI and automation

In the same release, BLS published AI exposure categories, and it placed Computer Occupations, All Other in the "Very high" tier. Network and computer systems administrators and computer network architects are in that tier too. BLS defines exposure as AI technology that could be or has been used to assist or complete some of the work, and it states that exposure does not imply job loss, productivity gains, automation probability or wage effects.

For an infrastructure team, that exposure shows up in configuration drafting, log summarization and ticket triage. The accountable parts of the job stay with the engineer: approving a change to a production firewall, deciding which cluster can tolerate a failed node, and signing off on a disaster recovery test.

Security pressure on legacy gear

Federal security agencies have published specific direction on aging infrastructure. CISA's BOD 26-02 told federal civilian agencies to inventory devices on CISA's end-of-support edge device list within three months of the Feb. 5, 2026 issuance. It gives them twelve months to decommission listed devices whose support ends on or before that deadline, eighteen months to remove all identified end-of-support edge devices, and twenty-four months to set up continuous discovery. On Oct. 30, 2025, CISA and the NSA published a guide to hardening on-premises Microsoft Exchange servers, warning that threat activity against vulnerable Exchange servers, including versions that have reached end-of-life, persists. Both documents describe work that lands on infrastructure engineers: inventory, replacement planning, migration and hardening.

Moving up

Common next steps are infrastructure or solutions architect, cloud platform lead, site reliability engineer, and IT infrastructure manager. To move up, pair broad technical range with clear writing and cost awareness, and volunteer for the multi-year refresh and migration programs that show both.

Dear Hiring Manager,

Please consider me for the IT Infrastructure Engineer opening at Ridgeview Health Partners. For the past six years I have worked on the infrastructure team at a regional manufacturer with four plants and a headquarters data center, first as a systems administrator and for the last three years as the engineer responsible for compute, storage and the site-to-site network.

My largest project was replacing an aging three-host virtualization cluster and its storage array before vendor support ended. I wrote the design, sized the new cluster from twelve months of performance data, built it with Ansible playbooks stored in Git, and moved 140 virtual machines over six weekend windows without an unplanned outage. I also added a second cluster at our largest plant and ran the first full failover test the company had ever completed.

On the network side, I replaced our branch VPN appliances with a pair of next-generation firewalls at each site, rewrote the rule base from scratch, and cut the number of permitted inbound services by half. I keep an inventory of every switch, firewall and server with its support end date, and I present a refresh forecast to our IT director each budget cycle so nothing becomes unsupported by surprise.

I hold the CCNA and the Azure Administrator Associate certification and am working toward the Terraform Associate. I write runbooks that the night operations staff actually use, and I am comfortable explaining a design tradeoff to a plant manager as well as to a security auditor.

Ridgeview's move to consolidate its clinic networks and expand its disaster recovery site is the kind of work I want to do next. I would welcome the chance to talk about how I could help.

Sincerely, Jordan Alvarez