Senior Network & Infrastructure Engineer

We're hiring a Senior Network & Infrastructure Engineer to sit at the top of our technical escalation chain and lead our most complex projects. This is a hands-on, on-site role in our Hauppauge office - not a management seat and not a ticket queue.

You are the final escalation point: the person our Level 1 and Level 2 techs come to when something is genuinely hard - the failed migration, the network that "randomly" drops, the firewall policy nobody else can untangle. You own the design and delivery of major infrastructure projects end to end, mentor the techs below you, and set the technical bar for how we build and support client environments.

We're looking for someone who takes pride in being the engineer who gets it fixed and gets it right - confident, personable, and exceptional with clients, with the judgment to lead a project and the ownership to see it through.

What You Will Do

• Serve as the final escalation point for servers, networking, virtualization, cloud, and security across our client base.
• Lead the design, build, and delivery of infrastructure projects end to end: server rebuilds, network redesigns, migrations, and cutovers.
• Architect and troubleshoot Layer 2/3 networks - VLANs, STP, routing, VPNs, and firewall policy design.
• Configure and manage Cisco, Fortinet, and Ubiquiti switching, routing, and firewall platforms (plus SonicWall/Meraki as needed).
• Lead on-prem-to-cloud and P2V/V2V migrations across VMware and Hyper-V; own the virtualization layer.
• Run Microsoft 365 tenant migrations, Exchange cutovers, and Teams/SharePoint deployments.
• Administer Windows Server, Active Directory, DNS/DHCP, Group Policy, and Azure AD/Entra (hybrid identity, conditional access, AADConnect).
• Own and validate BCDR platforms (Datto, Axcient) and DR runbooks.
• Mentor and level up Level 1/Level 2 technicians; document standards and raise the technical bar across the team.
• Work directly on-site with clients as the senior technical voice in the room, representing B&L professionally and confidently.

Do you have experience in Windows support?, * 5+ years in an MSP or multi-client environment, with demonstrable senior/escalation-level responsibility.

• Deep, hands-on networking expertise across Cisco, Fortinet, and Ubiquiti - VLANs, routing, switching, VPNs, and firewall rule/policy design.
• Advanced virtualization experience in VMware and/or Hyper-V, including migrations.
• Strong Windows Server, AD, and Azure/Entra experience (hybrid identity, conditional access).
• Expert Microsoft 365 administration, including tenant migrations and Exchange/Teams/SharePoint work.
• Proven ability to lead projects and run point on technical execution - scoping, planning, and delivering without hand-holding.
• Excellent communication, a strong ownership mindset, and the confidence to be client-facing.
• Comfortable with occasional, pre-scheduled after-hours/weekend maintenance windows as part of a salaried engineering role.

Bonus / Preferred

• Fortinet NSE, Cisco CCNA/CCNP, or Microsoft certifications.
• Experience with SentinelOne, ThreatLocker, or Blackpoint Cyber.
• Experience mentoring junior engineers or owning a technical standard/runbook.

Pulled from the full job description

• 401(k)
• Health insurance
• Retirement plan
• 401(k) matching
• Paid time off
• Vision insurance
• Dental insurance, * 401(k)
• 401(k) matching
• Dental insurance
• Health insurance
• Life insurance
• Paid time off
• Retirement plan
• Vision insurance