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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Systems Engineer (Tier 3) - Microsoft 365, Servers & Networking in Texarkana - **Company:** Energy Jobline - **Location:** Texarkana, TX, United States - **Experience:** Expert - **Salary:** $85,000.0 - $95,000.0 - **Contract:** Permanent contract - **Skills:** Microsoft Windows, Active Directory, Systems Engineering, User Authentication, Microsoft Azure, Backup Devices, CompTIA Security+, Cyber Security, Dynamic Host Configuration Protocol, Disaster Recovery, Domain Name System (DNS), Hyper-V, Virtual Private Networks (VPN), Microsoft Software, Windows Search, Windows Servers, Routing, Cloud Services, Security Software, Virtual Local Area Networks, Virtualization Technology, Wireless Networks, Sonicwall, Firewalls (Computer Science), Information Technology, 3-tier Architectures, Cloud Migration, Network Server, SentinelOne Expertise, Cisco, Server Operating Systems & Platforms, Vmware - **Published:** September 7, 2026 - **Apply:** https://www.energyjobline.com/job/senior-systems-engineer-tier-3-microsoft-365-servers-networking-texarkana-31553754 ## About the Role The strongest candidates will have substantial hands-on experience with: * Microsoft Windows desktop and server environments * Active Directory, Group Policy, DNS, DHCP, and management * Microsoft 365 administration, Exchange Online, Entra ID, and related cloud services * Business networking, including switching, routing, VLANs, VPNs, wireless networks, and firewalls * Hyper-V, VMware, or similar virtualization platforms * Backup, disaster recovery, endpoint management, and security platforms * Advanced technical troubleshooting and root-cause analysis * Supporting business-critical systems and communicating directly with clients This level of experience is typically gained through at least five years in systems administration, infrastructure support, senior technical support, or a similar role. Previous MSP or multi-client IT experience is strongly , but we will also consider experienced infrastructure professionals coming from corporate IT, healthcare, banking, manufacturing, education, or other multi-location environments. Our Technology Environment Experience with any of the following is helpful, but we do not expect every candidate to know every platform: * Microsoft 365, Azure, and Entra ID * Windows Server and Active Directory * SonicWall and other business-class firewalls * Hyper-V and VMware * ConnectWise or another PSA platform * NinjaOne or another RMM platform * Huntress, Microsoft Defender, SentinelOne, or similar security platforms * Business continuity and disaster-recovery solutions Microsoft, CompTIA, Cisco, SonicWall, or cybersecurity certifications are valued but not required. Practical experience, judgment, communication, and problem-solving ability are equally important. You May Be a Strong Fit If You * Enjoy solving technical problems that do not have obvious answers. * Approach troubleshooting methodically and look for the root cause. * Take ownership without needing to be repeatedly reminded or followed up with. * Know when to work independently and when to involve the right people. * Communicate professionally with clients and coworkers. * Remain organized while managing multiple priorities. * Enjoy sharing knowledge and helping less-experienced technicians improve. ## Description Complete Computing Solutions is seeking an experienced Senior Systems Engineer to serve as the highest technical escalation point for our service team. This position is designed for an engineer who enjoys solving difficult problems, taking ownership of complex client environments, and helping other technicians become better at what they do. You will work across Microsoft 365, Windows Server, Azure and Entra ID, networking, firewalls, virtualization, backups, endpoint security, and other business-critical systems. This is not an entry-level support position. You will be trusted to investigate complex issues, make sound technical decisions, communicate directly with clients, and see problems through to resolution. About Complete Computing Solutions Complete Computing Solutions is a growing managed IT services and cybersecurity company serving businesses throughout the Ark-La-Tex region. We provide managed IT, cybersecurity, Microsoft 365, cloud services, backup and disaster recovery, networking, infrastructure, and technical support. CCS was ranked #255 worldwide on the 2026 MSP 501 list, recognizing us as one of the leading managed service providers in the world. Our standard is simple: World-Class IT. Local Service. What You'll Do Advanced Technical Support * Serve as a senior escalation resource for complex issues that cannot be resolved by Tier 1 or Tier 2 technicians. * Troubleshoot advanced problems involving Windows Server, Active Directory, Microsoft 365, Entra ID, Azure, networking, firewalls, virtualization, backups, endpoint systems, and cybersecurity tools. * Diagnose infrastructure, connectivity, authentication, performance, and security issues across a variety of client environments. * Participate in major incident response and critical client escalations. * Perform advanced systems administration, maintenance, upgrades, and remediation. * Assist with server deployments, Microsoft 365 implementations, cloud migrations, network upgrades, and other infrastructure projects. * Identify recurring problems and recommend permanent solutions rather than repeatedly treating symptoms. * Review technical configurations and documentation to ensure client environments meet CCS standards and best practices. Client Communication * Communicate clearly with both technical and nontechnical clients. * Explain complex issues, recommendations, risks, and resolution plans in understandable . * Maintain accurate ticket notes, time entries, technical documentation, and client-facing updates. * Take ownership of assigned issues and follow them through to completion. * Build trusted client relationships through professionalism, responsiveness, and technical competence. Team Leadership * Provide technical guidance and troubleshooting assistance to Tier 1 and Tier 2 technicians. * Share knowledge and help develop the technical capabilities of the service team. * Contribute to internal documentation, standard operating procedures, and the CCS knowledge base. * Collaborate with service, project, and cybersecurity teams on implementations and remediation work. * Help identify opportunities to improve service delivery, internal processes, and client infrastructure. ## Related Videos - [How Cisco embraced a DevOps culture within its network engineering team](https://www.wearedevelopers.com/videos/99-how-cisco-embraced-a-devops-culture-within-its-network-engineering-team) - [WebAssembly: The Next Frontier of Cloud Computing](https://www.wearedevelopers.com/videos/972-webassembly-the-next-frontier-of-cloud-computing) - [Creating a routing app with Google Maps API from scratch](https://www.wearedevelopers.com/videos/831-creating-a-routing-app-with-google-maps-api-from-scratch) - [What makes Cybersecurity different for critical infrastructure?](https://www.wearedevelopers.com/videos/571-what-makes-cybersecurity-different-for-critical-infrastructure) - [Computer Vision from the Edge to the Cloud done easy](https://www.wearedevelopers.com/videos/263-computer-vision-from-the-edge-to-the-cloud-done-easy) - [Develop enterprise-ready applications for Microsoft Teams with Azure resources on modern web technologies](https://www.wearedevelopers.com/videos/187-develop-enterprise-ready-applications-for-microsoft-teams-with-azure-resources-on-modern-web-technologies) ## Related Articles - [What Are The Top Skills Required For Azure Developers?](https://www.wearedevelopers.com/magazine/77-what-are-the-top-skills-required-for-azure-developers) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [6 Emerging Technologies We’ll Learn About in 2025](https://www.wearedevelopers.com/magazine/381-6-emerging-technologies-we-ll-learn-about-in-2025) - [The Most Popular IT Jobs on the Market](https://www.wearedevelopers.com/magazine/376-the-most-popular-it-jobs-on-the-market) - [A Guide to Green Tech and Green IT Careers](https://www.wearedevelopers.com/magazine/374-a-guide-to-green-tech-and-green-it-careers) - [Where To Find Software Engineering Jobs](https://www.wearedevelopers.com/magazine/396-where-to-find-software-engineering-jobs)