ArcGIS Enterprise Administrator

OldRex Technologies; Washington (District of Columbia); On-site; USD 120,000 - 150,000; Full time

Job summary

OldRex Technologies in Arlington, VA, seeks a skilled GIS Systems Administrator to design, implement, and maintain enterprise GIS solutions for government and commercial clients. The role requires experience with Windows and Linux, SQL databases, and Esri ArcGIS Enterprise/Portal, delivering reliable, secure, and scalable GIS services.

Candidates must hold a TS/SCI clearance; a STEM BS is required. You will collaborate with cross‑functional teams to translate operational requirements into GIS

Qualifications

• Bachelor's in Computer Science, Mathematics, Geographic Information Systems (GIS) or STEM field.
• 3–5 years of experience designing, implementing, administering and maintaining enterprise GIS systems (PROD and DEV).
• Broad system administration experience on Windows and/or Linux.
• Experience with at least one RDBMS, including SQL query writing (SQL Server, Oracle, PostgreSQL).
• Experience with Esri software including ArcGIS Enterprise and Portal for ArcGIS and their APIs or interfaces.

Skills

GIS system design

Windows & Linux admin

SQL & RDBMS

Esri ArcGIS Enterprise

Networking concepts

Authentication concepts (SAML/OIDC)

Cloud SysOps

TS/SCI clearance

Education

Bachelor's in Computer Science, Mathematics, GIS or STEM

Tools

Esri ArcGIS Enterprise

Job description

Company Description

OldRex Technologies is a mission-driven technology company founded by U.S. Coast Guard veterans and rooted in precision, readiness, and service. The team translates complex operational requirements into practical, high-impact digital solutions for government and commercial clients. This background provides a distinctive “always ready” mindset that shapes how projects are planned, executed, and supported. Applicants can expect a culture that values reliability, attention to detail, and clear communication. Professionals who thrive in structured, purpose-oriented environments will find meaningful work and growth opportunities here.

Location: Arlington, VA

Clearance: TS/SCI

Requirements

• 3-5 professional experience designing, implementing, administrating and maintaining enterprise GIS systems (PROD and DEV)
• Broad system administration experience on Windows and/or Linux
• Experience with at least one RDBMS, including SQL query writing (such as SQL Server, Oracle, PostgreSQL)
• Experience with Esri software including ArcGIS Enterprise and Portal for ArcGIS and their associates APIs or interfaces
• Familiarity with network concepts and topics (such as domains, directories, DNS, HTTPS, firewalls, proxies, load-balancing)
• Familiarity with authentication concepts and topics (such as SAML, Web Tier, OIDC)
• Familiarity with cloud-based system operations (SysOps)
• TS/SCI US Security Clearance
• Bachelor's in Computer Science, Mathematics, Geographic Information Systems (GIS) or STEM related field

Recommended Qualifications

• Master's in Computer Science, Mathematics, Geographic Information Systems (GIS) or STEM related field
• One or more industry-standard IT certifications (such as Esri, CompTIA, Microsoft, Amazon)
• Experience with Esri software including ArcGIS Pro, ArcGIS Notebook Server, ArcGIS Monitor and their associates APIs or interfaces