Senior Systems Engineer

Job Description Job Description Our valued client is seeking a Senior Systems Engineer (Principal-Level) for their team in Aurora, CO. This is a contract opportunity with the possibility of extension. All work will be performed on-site. We are seeking a very senior, hands-on Sr. Systems Engineer for a contract engagement to provide deep technical expertise across core enterprise infrastructure. This role is designed for a seasoned individual contributor who can quickly assess complex environments, architect practical solutions, and resolve high-impact issues with minimal ramp-up. This is not a junior augmentation role. You will be brought in as a trusted technical authority to stabilize, improve, and guide critical systems. You will mentor and train the current system administrators on the existing technologies.

What You’ll Do Advanced Systems Engineering andArchitecture Serve as a senior technical expert across the enterprise, Microsoft, and infrastructure platforms Design, assess, and improve architectures involving: Microsoft 365 (Exchange, Entra ID/Azure AD, Teams, SharePoint) Active Directory (on-prem and hybrid) DNS, identity, and authentication services Windows Server platforms VMware virtualization environments Enterprise storage systems (SAN/NAS) Identify architectural risks and recommend pragmatic, supportable improvements High-Level Troubleshooting & Incident Resolution Understand and document existing architecture; suggest improvements for efficiency and security Act as an escalation point for complex, multi-layer infrastructure issues Troubleshoot across OS, identity, virtualization, and storage layers Perform root-cause analysis and implement durable fixes Quickly stabilize environments experiencing reliability or performance challenges Operational Impact Improve documentation, standards, and operational consistency Partner with internal teams (security, networking, cloud, application) to unblock progress Transfer knowledge to internal staff as needed Required Experience & Skills 10-15+ years of hands-on enterprise systems engineering experience Deep, hands-on practical expertise in: Microsoft 365 Active Directory (design, replication, trusts, GPOs) DNS and identity services Windows Server VMware Enterprise storage concepts and platforms Proven ability to diagnose and resolve complex infrastructure issues quickly Strong architectural judgment and systems thinking Excellent communication skills; able to explain complex issues clearly Comfortable operating independently with limited oversight Ideal Contractor Profile Principal- or lead-level individual contributor background Has been “the escalation point” in prior environments Thrives in ambiguous or high-pressure situations Able to deliver value immediately in a contract setting Contract Details Opportunity for extension based on performance and business need No expectation of people management Compensation for this position starts at $60.00/hour and includes optional medical, dental, vision, 401k, PTO, and holiday benefits.