Senior Network Engineer - Level 3

Systems Integration Inc.; Wallingford (CT); On-site; USD 120,000 - 150,000; Full time

Job summary

Systems Integration Inc. is seeking a Level 3 Senior Network Engineer for an in‑person role based in Wallingford, CT. You will lead complex IT infrastructure implementations, act as escalation for junior techs, and support on-site and client projects across MSP environments.

The ideal candidate has 5+ years in MSP settings, strong Windows Server/AD/Azure/M365 skills, and solid networking, virtualization, and security expertise. Travel to the Wallingford office is required five days per week.

Qualifications

• 5+ years of progressive IT experience in an MSP or multi-client environment.
• Strong technical proficiency in Windows Server environments, Active Directory, Azure, and M365 administration.
• Advanced knowledge of networking concepts (firewalls, routing, switching, VLANs, SD-WAN).
• Experience implementing and supporting virtualization platforms (VMware, Hyper‑V).
• Expertise with endpoint security, patching, and RMM tools.

Responsibilities

• Lead the implementation and support of complex IT infrastructure projects (server migrations, network redesigns, cloud transitions).
• Configure and troubleshoot advanced network devices (firewalls, Layer 2/3 switches, VLANs, VPN tunnels, routing policies).
• Deploy and manage Microsoft 365 services (Exchange Online, Teams, SharePoint, Intune, Conditional Access).
• Administer Azure AD, Azure VMs, Group Policy, DNS/DHCP, file/print services, and hybrid environments.

Job description

THIS IS AN IN-PERSON ROLE, 5 DAYS A WEEK, WITH TRAVEL TO WALLINGFORD, CT DAILY.

THIS IS NOT A DEVELOPER ROLE.

We are seeking an experienced and highly skilled Level 3 Senior Network Engineer to lead complex technical implementations, serve as an escalation point for junior technicians, and support infrastructure and cloud projects across our client base. This role is ideal for a seasoned professional with strong hands‑on experience in network design, Microsoft 365/Azure, virtualization, server environments, and firewall/security technologies within a Managed Services Provider (MSP) setting.

As a Senior Engineer, you will manage project scopes, act as technical lead for client deployments, and provide Tier 3 escalation support. You will mentor other team members, help refine internal processes, and ensure client solutions align with industry best practices and business goals.

We are looking for an individual who is a problem-solver and has a proven track record of working within a team environment to address challenging user computing issues successfully, and is accustomed to leveraging technical training opportunities to improve their skills.

Accountabilities include identifying user problems and working within structured problem management and resolution processes to remediate them within established SLAs, and involve working with other resources and vendors to deliver effective support services. Includes identifying, documenting, and troubleshooting user computing issues to resolution and maintaining customer satisfaction.

Responsibilities and Duties

• BE ABLE TO COMMUTE TO ON-SITE OFFICE IN WALLINGFORD, CT 5 DAYS PER WEEK
• Lead the implementation and support of complex IT infrastructure projects (server migrations, network redesigns, cloud transitions).
• Configure and troubleshoot advanced network devices (firewalls, Layer 2/3 switches, VLANs, VPN tunnels, routing policies).
• Deploy and manage Microsoft 365 services (Exchange Online, Teams, SharePoint, Intune, Conditional Access).
• Administer Azure AD, Azure VMs, Group Policy, DNS/DHCP, file/print services, and hybrid environments.
• Implement and manage backup and disaster recovery solutions (Datto, Veeam, or similar).
• Provide Tier 3 support and serve as the final escalation point for unresolved issues.
• Conduct site assessments, document technical environments, and make recommendations for improvements.
• Collaborate with vCIO and project managers to scope, plan, and execute IT initiatives.
• Mentor Level 1 and Level 2 technicians and provide knowledge transfer for issue resolution and best practices.
• Contribute to the development and improvement of technical SOPs, security baselines, and deployment templates.
• Maintain current technical documentation, network diagrams, and project notes in AutoTask and related systems.

Qualifications

Required:

• BE ABLE TO COMMUTE TO ON-SITE OFFICE IN WALLINGFORD, CT 5 DAYS PER WEEK
• 5+ years of progressive IT experience in an MSP or multi-client environment.
• Strong technical proficiency in Windows Server environments, Active Directory, Azure, and M365 administration.
• Advanced knowledge of networking concepts (firewalls, routing, switching, VLANs, SD-WAN).
• Experience implementing and supporting virtualization platforms (VMware, Hyper‑V).
• Expertise with endpoint security, patching, and RMM tools.
• Excellent troubleshooting and analytical skills for root cause analysis and problem resolution.
• Proven ability to lead IT projects and coordinate with internal teams and client stakeholders.
• Exceptional verbal and written communication skills.
• Valid U.S. driver's license and reliable transportation.
• Availability for after-hours support and on-call responsibilities when needed.

Preferred:

• Relevant certifications such as Microsoft 365 Enterprise Administrator Expert, Cisco CCNA/CCNP, Fortinet NSE4+, VMware VCP, or Azure Administrator Associate.
• Familiarity with PSA and documentation platforms (AutoTask, IT Glue).