Sr. Infrastructure Engineer

OverviewWe are seeking a Senior Infrastructure Engineer with extensive experience leading infrastructure consolidations, systems integrations, and enterprise migration projects. This role will play a critical part in integrating newly acquired organizations into the technology environment.The ideal candidate will have deep hands-on expertise across hybrid infrastructure, Active Directory, Microsoft 365, VMware, storage platforms, networking, and security. You will lead technical integration efforts from discovery through execution, ensuring seamless transitions into ETG standards while minimizing operational disruption.Key ResponsibilitiesIdentity & Directory Services IntegrationDesign and execute Active Directory consolidation strategies for acquired organizations.Establish and manage cross-domain and cross-forest trusts.Migrate AD DS objects, DNS, DHCP, and Group Policy Objects (GPOs).Transition legacy identity environments into ETG's hybrid Active Directory and Microsoft Entra ID architecture.Microsoft 365 Tenant ConsolidationLead tenant-to-tenant migrations into the corporate Microsoft 365 environment.Manage migrations across Exchange Online, SharePoint, OneDrive, Teams, and Intune.Coordinate user, device, and identity transitions while maintaining business continuity.Infrastructure, Virtualization & Storage MigrationPerform technical assessments of acquired infrastructure environments.Plan and execute migrations of VMware vSphere environments, including vCenter and ESXi hosts.Consolidate or decommission SAN/NAS storage platforms and legacy hardware infrastructure.Support server modernization and platform standardization initiatives.Network & Security IntegrationEstablish secure connectivity between acquired and corporate environments.Configure and support site-to-site VPNs, VLAN segmentation, routing, and firewall integrations.Migrate security policies and network configurations into ETG's standardized Fortinet environment.Endpoint & Server ModernizationLead workstation and server onboarding into corporate management platforms.Re-provision, domain-join, or Entra ID-join devices as required.Ensure compliance with corporate security, patching, and endpoint protection standards.Infrastructure DecommissioningPlan and execute the retirement of legacy systems following successful migrations.Decommission domain controllers, physical servers, hypervisors, storage arrays, and redundant cloud services.Validate data retention, compliance, and business requirements prior to shutdown activities.Required Qualifications5+ years of experience as a Senior Infrastructure Engineer, Systems Engineer, or Infrastructure Architect.Proven success delivering complex infrastructure integrations, domain consolidations, or M&A technology migrations.Expert knowledge of:Active Directory Domain Services (AD DS)DNS, DHCP, and Group Policy (GPO)Cross-forest trusts and identity migration methodologiesMicrosoft Entra ID and hybrid identity environmentsStrong hands-on experience with:VMware vSphere (vCenter, ESXi)Physical server infrastructure (Dell, HPE)SAN/NAS storage technologiesMicrosoft 365 administration and migrationsIntune and endpoint managementSolid understanding of networking fundamentals, including:VLANsRouting and switchingSite-to-site VPNsFirewall administrationExperience working in enterprise or multi-site environments.Preferred QualificationsExperience with enterprise migration platforms such as:QuestBitTitanAvePointCloudFuzePrior experience supporting mergers, acquisitions, carve-outs, or large-scale infrastructure transformation initiatives.Fortinet firewall administration experience.Relevant certifications such as Microsoft, VMware, Fortinet, or Azure certifications.Top SkillsWindows InfrastructureActive DirectorySystems EngineeringVMwareMicrosoft 365 / Entra IDCloud TechnologiesNetworking & SecurityJob Type & LocationThis is a Contract position based out of Menomonee Falls, WI.Pay and BenefitsThe 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)Job Type & LocationThis is a Contract position based out of Menomonee Falls, WI.Application DeadlineThis position is anticipated to close on Oct 26, 2026.Workplace TypeThis is a fully onsite position in Menomonee Falls,WI.About TEKsystemsWe'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 Were 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. Were 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. Were strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. Were 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 be 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.Job SummaryJob number: JP-006344839Profession: Systems Administrator/Engineer