Sr. Network Administrator

Apex Systems; Alexandria (VA); On-site; USD 95,000 - 125,000; Full time

Benefits offered by this job

ESPP (Employee Stock Purchase Program)

401K with company match

Health Savings Account (HSA)

Employee Assistance Program (EAP)

Certification discounts

Job summary

Everforth Apex Systems in Alexandria, VA is seeking a Senior Network Administrator to maintain secure, high‑performing network services on-site. You will work with engineers, admins, and security teams to troubleshoot, design, and implement network solutions that support critical missions.

Required: 3+ years of experience, CCNA and Security+ certifications, TCP/IP, VLANs, VPN, and Cisco ISE/DNA Center proficiency. TS/SCI eligibility is preferred, and 100% on-site work is expected.

Qualifications

• 3+ years of Network Administrator experience.
• Experience configuring switches and routers.
• Strong understanding of TCP/IP, DNS, DHCP, STP, SNMP, and routing fundamentals.
• Hands-on with Cisco ISE and DNA Center (DNA-C).
• Knowledge of firewalls, ACLs, NAT, and VPN technologies.

Responsibilities

• Troubleshoot incidents and implement network changes.
• Participate in design discussions and deployments.
• Support Cisco ISE and DNA Center for access control and policy automation.
• Implement VLANs, routing policies, and network segmentation.
• Maintain secure environments with firewall rules and VPNs.
• Document activities and follow change management processes.

Skills

Network troubleshooting

TCP/IP fundamentals

DNS & DHCP

VLANs & routing

Firewall & VPN basics

RADIUS & 802.1X

Wireshark / NetFlow

Cisco ISE & DNA Center

Documentation

Education

High School diploma

Tools

Cisco ISE

DNA Center

Wireshark

NetFlow

Job description

Sr. Network Administrator - Alexandria, VA (22315)

Location: Alexandria, VA (22315); 100% onsite Monday-Friday

Job Description

Our work depends on a Network Administrator Senior joining our team to maintain and enhance secure, reliable, and high‑performance network services that enable the customer’s critical mission operations.

Responsibilities

• Work closely with senior network engineers, system administrators, and security teams to troubleshoot issues, resolve incidents, and implement network changes in a collaborative team environment.
• Participate in network design discussions and deployments, supporting equipment setup, cabling, fiber work, and physical infrastructure buildouts while adhering to established standards and best practices.
• Support Cisco ISE and DNA Center (DNA‑C) to manage network access control, policy‑based automation, and assurance in a fast paced environment.
• Implement and manage VLANs, routing policies, access control rules, and network segmentation to support secure, scalable, and logically separated environments.
• Assist in maintaining secure network environments by enforcing firewall rules, VPN configurations, network access control policies, and security best practices in support of compliance and cyber defense objectives.
• Utilize full scope of technical and interpersonal skills to further the mission.

Required Education

High School diploma

Required Experience

3+ years of experience

Required Technical Skills

• Experience configuring and supporting network switches and routers
• Strong understanding of TCP/IP, DNS, DHCP, STP, SNMP, and routing fundamentals
• Hands‑on experience with Cisco ISE and DNA Center (DNA‑C)
• Knowledge of firewalls, ACLs, NAT, and VPN technologies
• Proficiency with VLANs, trunking, inter‑VLAN routing, and segmentation
• Experience with packet capture and analysis tools (e.g., Wireshark, NetFlow)
• Familiarity with enterprise wireless technologies and basic RF troubleshooting
• Understanding of network access control systems (RADIUS, TACACS+, 802.1X)
• Working knowledge of cabling standards, fiber infrastructures, and physical network components

Required Certifications

CompTIA Security+ Cisco Certified Network Associate (CCNA)

Security Clearance Level

TS/SCI (must be able to maintain or obtain)

Required Skills and Abilities

• Strong troubleshooting and analytical skills with a methodical approach to problem solving
• Effective verbal and written communication skills to collaborate with technical and non‑technical stakeholders
• Ability to follow standard operating procedures, change management processes, and security/compliance requirements
• Strong attention to detail and ability to maintain accurate documentation
• Ability to work both independently and as part of a team in a fast‑paced, mission‑focused environment

Preferred Skills

• Experience with cloud networking concepts (Azure or AWS)
• Exposure to SD‑WAN technologies
• Familiarity with VoIP and QoS principles
• Experience with network automation tools or scripting (e.g., Python, PowerShell, Ansible)

Location

On Customer Site

Benefits Overview

• Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection.
• We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure.
• We also offer a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts.
• In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA.
• Everforth Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach.
• You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Everforth Apex team member can provide.

Equal Opportunity Statement

Everforth Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law.