Network Engineer (Cisco, Linux, VPNs & Scripting)

Summit Technology Management LLC; Chantilly (VA); On-site; USD 110,000 - 140,000; Full time

Job summary

EndLine Systems is seeking a proactive Network Engineer to configure, secure, and maintain our core enterprise networking infrastructure, virtual environments, and Linux systems. You’ll design VPNs, enforce firewall policies, and automate routine tasks with Python/Bash while ensuring high availability and secure remote access.

You will work with Cisco hardware, Linux firewalls, and virtualization platforms (VMware ESXi, KVM, Proxmox), plus implement monitoring and best practices for topology and

Qualifications

• 2–5 years hands-on experience in network administration or network engineering.
• Experience with Linux Systems Administration (Ubuntu, RHEL, CentOS, or Rocky Linux) and command-line management.
• Solid experience configuring Linux Firewalls (iptables, nftables, ufw) and system security controls.
• Practical experience configuring and troubleshooting VPN technologies (IPsec, OpenVPN, WireGuard).
• Proficiency in basic programming/scripting using Python, Bash, or similar languages for task automation.
• Practical experience managing networking within Virtual Machine environments (vSwitches, virtual bridges, hypervisors).
• Core networking protocol expertise: TCP/IP, Subnetting, DNS, DHCP, SNMP, and HTTP/S.

Responsibilities

• Core Network Operations: Configure, maintain, and troubleshoot enterprise network hardware, including Cisco routers, switches, and firewalls.
• VPN & Secure Connectivity: Design, deploy, and support site-to-site and remote-access VPNs to ensure encrypted communications.
• Linux Security & Administration: Configure and manage Linux firewalls and Linux server administration.
• Network Automation & Scripting: Write and maintain programs/scripts to automate backups, log parsing, and monitoring tasks.
• Virtualization Support: Support network configurations and virtual bridging across VMs and hypervisors.
• Troubleshooting & Remediation: Diagnose and resolve network incidents, latency, and routing issues using analysis tools.
• Documentation & Compliance: Maintain topology diagrams, IPAM, and runbooks.

Skills

Linux system administration

VPN technologies

Network engineering

Python/Bash scripting

Firewall configuration

Virtualization

TCP/IP/DNS/DHCP

Wireshark/monitoring

Tools

iptables

nftables

ufw

Wireshark

VMware ESXi

KVM

Proxmox

Job description

About the Role

We are seeking a proactive and detail-oriented Network Engineer to join our infrastructure team. In this role, you will be responsible for configuring, maintaining, and securing our core enterprise networking infrastructure, virtual environments, Linux systems, and secure remote-access connections.

You will work closely with our engineering team to maintain high system availability, implement Linux-based firewall rules, build and maintain secure VPN tunnels, and automate routine operational tasks using languages like Python and Bash. This position is ideal for a growing engineer looking to expand their technical capabilities in network security, virtualization, automated cloud orchestration, and advanced encryption frameworks.

Key Responsibilities

• Core Network Operations: Configure, maintain, and troubleshoot enterprise network hardware, including Cisco routers, switches, and firewalls.
• VPN & Secure Connectivity: Design, deploy, and support site-to-site and remote-access VPNs (IPsec, OpenVPN, WireGuard) to ensure encrypted, secure communications.
• Linux Security & Administration: Configure and manage Linux firewalls (iptables, nftables, ufw) alongside general Linux server administration (DNS, DHCP, SSH, Syslog).
• Network Automation & Scripting: Write and maintain basic programs/scripts using Python, Bash, or similar languages to automate system backups, log parsing, and routine network monitoring tasks.
• Virtualization Support: Support network configurations and virtual bridging across Virtual Machines (VMs) and hypervisors (e.g., VMware ESXi, KVM, Proxmox).
• Troubleshooting & Remediation: Diagnose and resolve Layer 1 through Layer 7 network incidents, packet loss, routing failures, and performance bottlenecks using traffic analysis tools.
• Documentation & Compliance: Maintain precise topology diagrams, IP address management (IPAM), and operational runbooks.

Required Qualifications

• 2–5 years of hands-on experience in network administration or network engineering.
• Hands-on experience with Linux Systems Administration (Ubuntu, RHEL, CentOS, or Rocky Linux) and command-line management.
• Solid experience configuring Linux Firewalls (iptables, nftables, ufw) and system security controls.
• Practical experience configuring and troubleshooting VPN technologies (IPsec, OpenVPN, WireGuard).
• Proficiency in basic programming/scripting using Python, Bash, or similar languages for task automation.
• Practical experience managing networking within Virtual Machine environments (vSwitches, virtual bridges, hypervisors).
• Core networking protocol expertise: TCP/IP, Subnetting, DNS, DHCP, SNMP, and HTTP/S.

Desired Skills

• Infrastructure Automation & Orchestration: Experience with automation and configuration management tools like Ansible, as well as cloud orchestration frameworks (e.g., Terraform, CloudFormation).
• Container Networking: Familiarity with containers and container networking concepts (e.g., Docker, Kubernetes CNI plugins).
• Network Encryption Experience: Familiarity with network encryption protocols and security products (e.g., TLS/SSL, MACsec, hardware encryptors).
• Industry certifications such as CCNA, CompTIA Security+, or Linux Professional Institute (LPIC-1 / RHCSA).
• Experience with network monitoring tools (e.g., Wireshark, Nagios, Zabbix, PRTG).

About EndLine Systems

EndLine Systems is a startup focused on specialized engineering for complex missions across network engineering, systems engineering, software development, and cybersecurity. We are seeking engineers who enjoy tackling multi-disciplinary technical challenges and delivering reliable, field-ready solutions.

Eligibility & Clearance Requirements

• Citizenship: Position requires United States (US) Citizenship only. Applicants selected will be subject to a background investigation and must meet eligibility requirements for access to classified information.
• Security Clearance: An active Top Secret (TS) security clearance is strongly preferred.

Accommodations

EndLine Systems provides reasonable accommodations to qualified individuals with disabilities. If you need assistance or an accommodation during the application process, please contact us at [e-mail].

Equal Opportunity Employer

EndLine Systems is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or protected veteran status.