Linux Systems Engineer – Squid Proxy & RADIUS Specialist

Role: Linux Expert

Location: Denton, TX (Onsite)

USC

Job Summary:

We are looking for a highly proficient Linux Expert with experience in managing and optimizing Squid Proxy and RADIUS servers. The ideal candidate will be responsible for deploying, configuring, and maintaining these services in a secure, scalable Linux environment to support enterprise network access control and web caching/proxy services.

Key Responsibilities:

• Install, configure, and maintain Squid Proxy servers on Linux platforms to optimize web traffic, caching, and filtering.
• Deploy and manage RADIUS servers (e.g., FreeRADIUS) for authentication, authorization, and accounting in network environments.
• Integrate Squid and RADIUS with Active Directory, LDAP, or other identity management systems.
• Monitor, troubleshoot, and tune performance of Squid and RADIUS services to ensure high availability and security.
• Implement access control policies, filtering rules, and authentication mechanisms.
• Maintain system security by applying patches, updates, and configuring firewalls.
• Analyze logs and metrics for both Squid and RADIUS to diagnose issues and improve system performance.
• Develop scripts or automation tools to streamline administration and reporting.
• Collaborate with network, security, and application teams to meet organizational requirements.
• Document system configurations, processes, and incident resolutions.
• Patching and remediation of Security Vulnerabilities in Linux servers

Required Qualifications:

• 5 years of hands-on experience administering Linux systems (RedHat, CentOS, Ubuntu, Debian, or similar).
• Strong expertise configuring and managing Squid Proxy servers.
• Solid experience with RADIUS servers, preferably FreeRADIUS, including configuration and integration.
• Understanding of authentication protocols (PAP, CHAP, EAP, PEAP).
• Familiarity with network protocols such as TCP/IP, DNS, DHCP, and firewall management.
• Experience with identity management integration (LDAP, Active Directory).
• Proficiency in shell scripting (Bash, Python, Perl).
• Strong troubleshooting and analytical skills.
• Good understanding of security best practices in Linux environments.
• Strong communication and documentation skills.

Preferred Qualifications:

• Experience with other proxy technologies or authentication services.
• Knowledge of VPN and wireless authentication workflows.
• Understanding of network security tools and concepts (firewalls, IDS/IPS).
• Experience with monitoring tools (e.g. Centreon).
• Relevant certifications such as RHCE, LPIC, or equivalent.