Sr. Infrastructure Engineer

TEKsystems; Menomonee Falls (WI); On-site; USD 69,000 - 96,000; Full time

Benefits offered by this job

Medical, dental & vision

401(k) Retirement Plan

Time Off/Leave (PTO)

Job summary

TEKsystems is seeking an Infrastructure Engineer to drive the technical integration of acquired entities. You’ll consolidate hybrid environments, unify AD, migrate Microsoft 365, and integrate firewalls into Fortinet standards.

You’ll lead cross-functional workstreams and re-house endpoints to Entra ID, ensuring compliance and security across the estate. This contract-based, onsite role is based in Menomonee Falls, WI, with four days onsite and one remote day per week.

Qualifications

• 5–7 years of experience as an Infrastructure Engineer or Systems Architect.
• Expert-level knowledge of AD DS, DNS/DHCP, GPOs, cross-forest trusts, ADMT or equivalent tools, and hybrid Entra ID sync.
• VMware vSphere, vCenter/ESXi, bare-metal provisioning, and SAN/NAS storage migration expertise.
• Practical experience migrating M365 tenants and managing Entra-joined devices.
• Experience with perimeter firewalls, routing, VLANs, and site-to-site VPNs.

Responsibilities

• Plan, execute, and finalize the integration of acquired entities into the existing infrastructure.
• Lead cross-functional workstreams to consolidate hybrid environments and UNIFY domains and tenants.
• Migrate VMware workloads and reallocate or decommission SAN/NAS storage.
• Merge perimeter firewall rules into Fortinet standards and establish site-to-site VPNs.
• Re-house endpoints and servers to Entra ID, ensuring corporate PATCH, security and compliance.
• Safely retire legacy DCs, servers, hypervisors, and redundant cloud software after data retention reviews.

Skills

Windows

Infrastructure

Systems engineering

Active directory

Cloud

Tools

VMware vSphere

vCenter/ESXi

Dell/HPE servers

SAN/NAS storage

Job description

Description

We are seeking a Infrastructure Engineer with deep hands-on expertise in infrastructure consolidation and systems integration. In this role, your primary focus will be planning, executing, and finalizing the technical integration of acquired entities into the infrastructure.

You will lead cross-functional workstreams to consolidate hybrid environmentscollapsing legacy Active Directory domains, migrating VMware clusters and SAN/NAS storage arrays, unifying Microsoft 365 tenants, and migrating perimeter firewalls into the ETG Fortinet standard.

Primary M&A Integration Responsibilities

• Directory & Identity Unification: Architect and execute domain consolidation plans. Establish active directory domain trusts, migrate Active Directory Domain Services (AD DS) objects, rationalize Group Policies (GPOs), and manage cutovers from legacy identity setups into our target hybrid/Entra ID structure.


• Tenant-to-Tenant Migrations: Lead the consolidation of acquired Microsoft 365 environments into the corporate tenant. Execute migrations across Exchange Online, Teams, SharePoint, OneDrive, and device management (Intune/Entra ID join).


• Compute, Virtualization & Storage Absorption: Conduct technical discovery on acquired physical and virtual infrastructure. Migrate and consolidate VMware vSphere (vCenter/ESXi) workloads onto target hypervisors and re-allocate or decommission acquired SAN/NAS storage arrays.


• Network & Firewall Integration: Establish site-to-site IPsec VPN connectivity, harmonize IP addressing/VLANs, and merge network security rulesets from acquired firewalls into corporate Fortinet standards.


• Endpoint & Server Re-homing: Lead the re-provisioning, domain-rejoining, or Entra-joining of acquired server inventory and end-user devices to enforce corporate compliance, patching, and endpoint protection standards.


• Decommissioning & Legacy Sunset: Safely retire legacy domain controllers, physical servers, hypervisors, and redundant cloud software once integration and data retention requirements are verified.

Core Infrastructure & Technical Qualifications

• Experience: 5-7 years of experience as a Infrastructure Engineer or Systems Architect, with a proven track record of completing complex IT integrations, domain consolidations, or M&A migrations.


• Active Directory & Identity: Expert-level knowledge of AD DS, DNS/DHCP, GPOs, cross-forest trusts, ADMT or equivalent identity migration tools, and hybrid Entra ID sync (Azure AD Connect / Cloud Sync).


• Virtualization & Hardware: Strong in VMware vSphere environments (vCenter, ESXi hosts), bare-metal server provisioning (Dell/HPE), and SAN/NAS storage migration (iSCSI, Fibre Channel, NFS).


• Microsoft Cloud & Device Management: Practical experience executing M365 tenant-to-tenant migrations, managing Entra-joined machines, and enforcing Intune MDM policies.


• Networking & Security Fundamentals: Working experience configuring perimeter firewalls, routing, VLAN segmentation, and site-to-site VPN tunnels.

Preferred Qualifications

• Migration Tooling Expertise: Experience utilizing enterprise migration software (e.g., Quest, BitTitan, AvePoint, CloudFuze) for mailbox, file share, and tenant consolidation

Skills

• Windows, Infrastructure, Systems engineering, Active directory, Cloud, Vmware

Top Skills Details

• Windows,Infrastructure,Systems engineering,Active directory,Cloud

Additional Skills & Qualifications

• Onsite 4 days a week, remote Friday

Job Type & Location

This is a Contract position based out of Menomonee Falls, WI.

Pay And Benefits

The pay range for this position is $50.00 - $70.00/hr.

Individual compensation offered for this position within this range will depend on many factors, including qualifications, skills, relevant experience, job knowledge, geographic location, internal equity, and other pertinent job-related factors.

Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following: Medical, dental & vision Critical Illness, Accident, and Hospital 401(k) Retirement Plan Pre-tax and Roth post-tax contributions available Life Insurance (Voluntary Life & AD&D for the employee and dependents) Short and long-term disability Health Spending Account (HSA) Transportation benefits Employee Assistance Program Time Off/Leave (PTO, Vacation or Sick Leave)

Application Deadline

This position is anticipated to close on Oct 25, 2026.

Workplace Type

This is a fully onsite position in Menomonee Falls, WI.

About TEKsystems

We're partners in transformation. We help clients activate ideas and solutions to take advantage of a new world of opportunity. We are a team of 80,000 strong, working with over 6,000 clients, including 80% of the Fortune 500, across North America, Europe and Asia. As an industry leader in Full-Stack Technology Services, Talent Services, and real-world application, we work with progressive leaders to drive change. That's the power of true partnership. TEKsystems is an Allegis Group company.

The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

About TEKsystems And TEKsystems Global Services

We're a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. We're a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed. We're strategic thinkers, hands on collaborators, helping customers capitalize on change and master the momentum of technology. We're building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at TEKsystems.com.

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

San Francisco Fair Chance Ordinance: Pursuant to the San Francisco Fair Chance Ordinance, for all positions located in the city and county of San Francisco, we will consider for employment qualified applicants with arrest and conviction records.

Massachusetts Lie Detector: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall subject to criminal penalties and civil liability.

Use of Artificial Intelligence (AI): We may use Artificial Intelligence (AI) to support parts of our hiring process, including sourcing, screening, and evaluating candidates. AI helps assess applications and qualifications, but final decisions are made by our hiring team. By applying, you acknowledge and agree that your application may be reviewed using AI tools.