Senior Infrastructure Engineer

Senior Infrastructure Engineer

MSP4, LLC  |  Full-Time  |  Remote (United States)  |  Up to 25% Travel  |  6+ Years Experience

About the Role

MSP4 operates as the embedded IT department for a portfolio of clients spanning professional services, legal, distribution, manufacturing, and government sectors. Environments range from 50 to 1,500 users and carry real compliance weight: CMMC L2, NIST 800-171, and SOC 2 are active requirements across this client base.

This role owns infrastructure delivery across that portfolio. You design, implement, and support on-premises and hybrid cloud environments: bare metal, virtualization, SAN and HCI storage, backup and recovery, and hardened Windows Server configurations. Cloud work spans AWS, Azure Commercial, and Azure Government. Design authority sits with our Principal Solutions Architect. This role owns clean execution, thorough documentation, and the judgment to improve what exists rather than rebuild it.

Remote within the United States. Travel up to 25% for major client project deployments. Day-to-day work is executed remotely.

What You Will Do

• Deploy and maintain Windows Server environments on bare metal and virtualized platforms: VMware vSphere, Microsoft Hyper-V, and Proxmox
• Design and implement SAN and HCI solutions (NetApp, Pure Storage, Nutanix, VMware vSAN) and manage Mellanox/RDMA high-speed fabric infrastructure
• Architect and operate hybrid cloud environments across AWS, Azure Commercial, and Azure Government, covering IaaS, identity, and landing zone configurations
• Own Veeam-based backup and disaster recovery implementations: design, deployment, testing, and documentation
• Apply STIG hardening and NIST 800-171 controls across Windows Server environments in support of CMMC L2 and SOC 2 compliance requirements
• Support the infrastructure layer beneath the line-of-business and ERP applications used across these sectors: practice management, distribution, manufacturing, and accounting platforms. Experience supporting the infrastructure under mid-market ERP and line-of-business systems (for example Epicor, Infor SyteLine, or Sage) is valued. The application runs on what you build and maintain
• Own the SQL Server platform layer for client ERP and line-of-business applications: installation, licensing, patching and version upgrades, Always On Availability Groups or failover cluster instances, application-consistent backup coordination with Veeam, storage layout for tempdb and data and log files, and baseline instance configuration. DBA-level query tuning, indexing strategy, and application-side schema work sit with client DBAs or application vendors
• Support the infrastructure layer for Citrix Virtual Apps and Desktops: VDA compute and storage provisioning, machine catalog management, hypervisor integration, and NetScaler gateway configuration. Dedicated Citrix specialists own application delivery and session configuration; your ownership is the layer underneath
• Produce documentation that meets audit standards and enables other engineers to maintain what you build
• Travel to client sites up to 25% for major project-based deployments

Qualifications Matrix

Candidates are scored against these. Categories: Technical, Functional, Consulting, Credentials.

Eligibility & Scoring (Required vs Preferred)

Required. Absence screens the candidate out.

• 6+ years infrastructure engineering in production environments (matrix #12)
• US-based work location and US-person status (matrix #13). You must qualify as a US person: US citizen, US national, lawful permanent resident (green card holder), or protected individual (refugee or asylee) under US law. Authorization to work in the United States is not sufficient on its own. A non-immigrant work visa (H-1B, L-1, TN, and similar), F-1 OPT/CPT, or an Employment Authorization Document does not meet this requirement. This role's access to Controlled Unclassified Information and export-controlled systems is restricted to US persons under CMMC L2 and US export control regulations (ITAR / EAR)
• Hands-on Windows Server depth: Active Directory, DNS, DHCP, Group Policy, PKI, server lifecycle (matrix #1)
• Operational SQL Server depth at the platform layer (matrix #2)
• Hands-on virtualization across at least two platforms (matrix #3)
• Veeam Backup & Replication design and administration (matrix #6)
• Ability to apply documentation and standards set by others without constant design input (matrix #11)
• Discovery-led investigation: structured inventory and gap identification before recommendation (matrix #15)

Preferred. Strengthens a candidate, never screens one out.

• SAN/HCI depth beyond working knowledge; Mellanox/RDMA fabric experience (matrix #4)
• Azure Government and federal-adjacent compliance exposure (matrix #5, #7)
• Citrix Virtual Apps and Desktops infrastructure-layer experience (matrix #8)
• Certifications: AZ-104, AZ-800/AZ-801, AZ-305, VMware VCP, AWS Solutions Architect Associate (matrix #14)
• Prior multi-client / MSP service delivery experience (matrix #9)

Core Competencies

How We Work

MSP4 does not operate like a traditional IT department or a ticket-centric help desk. We function as embedded IT leadership for our clients, accountable to their outcomes.

Our Principal Solutions Architect owns the design framework. Engineers at every level, including senior, execute within that framework. The tier structure keeps a multi-client portfolio consistent and audit-ready. Candidates who need design authority to feel effective should pass on this role. Candidates who find satisfaction in high-quality execution and in earning client trust through reliability will do well here.

We are building the operating model in real time. Some processes are documented; others are being written as we go. People here help shape what does not yet exist while executing reliably within what does.

About MSP4

MSP4, LLC provides infrastructure, security, and IT advisory services to mid-market professional services, manufacturing, distribution, legal, and government clients across the United States. Our commercial practice and regulated practice serve organizations with serious compliance requirements including SOC 2 Type II and CMMC Level 2.

We are a small team. Every person on it has direct impact on client outcomes. The ladder is tiered for scope and audit; access is not. Everyone here has direct access to everyone else, up to and including the CEO.

Work Environment & Location

• Remote within the United States. Day-to-day work is executed remotely.
• Travel up to 25% for major client project deployments.
• US-based work location and US-person status required. Work authorization alone (work visa, OPT, or EAD) does not qualify; see Required for the full definition.
• Extended periods at a computer performing configuration, build, and documentation work; occasional on-site work in client server rooms and data closets during deployments.

Equal Opportunity Statement

MSP4, LLC is an equal opportunity employer. All qualified applicants receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, protected veteran status, or any other characteristic protected by applicable federal, state, or local law.

How to Apply

Alongside your resume, submit a one-page cover page in PDF. Name the file CoverPage_LastName_FirstName_SeniorInfrastructureEngineer.pdf. Include a header line with your name, the date, and the JD version string shown at the bottom of this posting.

On the cover page, answer the following in order:

1. Describe one architecture or operational decision you disagreed with at a prior role. What was your position, what did you do about it, and how did it resolve?
2. Name one platform or technology listed in this JD where your depth is shallow. Describe how you would come up to speed in your first 90 days.

Close with the following statement exactly: "I understand that design authority for this role sits with the Principal Solutions Architect, and that my role is to execute within that framework."

One page. PDF only.

JD v4.0. Retain this version string on your cover page.