Senior Systems Administrator

Job Title : Senior Systems Administrator

Department : IT / Engineering

Reports To : RSekure Program Manager

Location : Chantilly, VA

Schedule : Monday – Friday

Hours : Full-time, 40-hours / week

Clearance Req : TS / SCI – Full-Scope Polygraph

Position Summary

RSekure is seeking a highly skilled Senior Systems Administrator to manage and maintain Linux and Windows environments in a mixed-OS infrastructure supporting a high-performance, commercial web-based platform. The role requires hands-on expertise with AWS, Linux (Red Hat / Rocky), Windows Service environments, and PostgreSQL, plus strong scripting and automation skills. This position partners with developers, end users, and management to ensure systems are secure, stable, and scalable, while elevating automation, security, and uptime across production times.

Essential Duties and Responsibilities

• Administer and maintain Red Hat / Rocky Linux systems, including updates, patching, system hardening, and configuration.
• Ensure secure and stable integrations, deployments, and system testing.
• Develop and maintain automation scripts to streamline systems operations.
• Provide Tier 2 / 3 technical support for Linux-based systems and applications.
• Manage AWS cloud infrastructure for a commercial web-based application.
• Implement and maintain secure, scalable cloud resources (EC2, S3, IAM, RDS, etc.).
• Create and maintain streamlined CI / CD pipelines and infrastructure-as-code (IaC) for automated deployments.
• Support and coordinate with development and QA teams for infrastructure needs.
• Administer standalone Windows domains and workstations (Windows 11 Pro, Windows Server 2025).
• Manage domain services including DNS, DHCP, WSUS, Group Policy, and software such as Adobe Photoshop.
• Maintain and support artist workstations and creative production environments.
• Monitor and support a high-volume PostgreSQL transactional database environment.
• Perform routine maintenance, backup, and performance tuning in coordination with DBAs.
• Support Docker Desktop for local Linux container use on Windows systems.
• Coordinate with users, management, and contractors for system changes, upgrades, and troubleshooting.
• Ensure minimal disruption to operations during maintenance or deployments.
• Enter the actual time worked, once complete, at the end of the day, or no later than 10 : 00 a.m. the following workday, and submit timesheets at the end of each pay period.
• Monitor RSekure email on a regular basis, at least 2 times per week, and respond accordingly.
• Complete required compliance training as assigned.
• Other duties as assigned.

Qualifications, Knowledge, and Critical Skills

Education and Work Experience

Desired Certifications and Licenses

Special Requirements

Work Environment

Employee will be working indoors in an office environment with other people. Typical indoor and computer related noise level, and typical office, paper, and equipment related dust. Exposure to video display terminals occurs on a regular basis.

Physical Demands

To successfully perform the essential functions of the job, the employee needs to be able to sit at a workstation for extended periods; use hand(s) to handle or feel objects, tools, or controls; reach with hands and arms; talk and hear; see to read printed materials and computer screens; mobility to work in a typical office setting. The ability to stand, walk, squat, bend, kneel, stoop, and climb will be required for this position. Ability to work on desktop or laptop computer for extended periods of time reading, reviewing / analyzing information, and may be required to provide recommendations, summaries and / or reports in written format. Must be able to effectively communicate with others verbally and in writing. Employee must be able to lift and / or move moderate amounts of weight, typically up to 30 pounds. Regular and predictable attendance is essential.

ADA : RSekure will make reasonable accommodations in compliance with the Americans with Disabilities Act of 1990.

EEO / AA : RSekure does not discriminate based on race, color, national origin, sex, religion, age, disability, sexual orientation, gender identity, veteran status, height, weight, or marital status in employment or the provision of services and is an equal access / equal opportunity / affirmative action employer.

This job description is not intended to be an all-inclusive list of duties and standards of the position and will be reviewed periodically as duties and responsibilities change with business necessity. Essential job functions are subject to modification. Incumbents will follow any other instructions, and perform any other related duties, as assigned by their supervisor.

Company Overview

RSekure employees work alongside their civilian and military counterparts in the federal government to find creative, innovative solutions to today's problems. Our teams are committed to excellence and dedicated to our clients' missions. We believe in hiring bright people and empowering them to do their best work from day one. Bring your skills and share our vision! Learn more about us at

Why Join Us

RSekure prides itself on its tradition of service, responsiveness and team work ethic. We don't just hire employees; we develop partnerships with our staff based around their personal career and educational goals. RSekure encourages professional development through our company-paid educational programs and training.

Job Posted by ApplicantPro