Senior Enterprise Network Services Engineer

Core4ce is seeking a Senior Enterprise Network Services Engineer to design implement and maintain secure and scalable enterprise network infrastructures.

The ideal candidate

will have a strong background in network engineering security routing firewall management load balancing and automation. This role requires deep knowledge of TCP/IP networking encryption protocols traffic analysis scripting and cloud networking. Additionally the candidate will be responsible for planning IT security projects troubleshooting complex network issues and ensuring compliance with security policies.

Responsibilities

Design configure install and manage enterprise network infrastructure including routers switches firewalls and load balancers. Plan and schedule the installation or modification of network hardware and software. Implement and maintain secure network configurations across multi-VRF Cisco routers and enterprise environments. Troubleshoot and analyze TCP/IP network traffic including TCP 3-way handshake TCP window scaling and MSS. Capture and analyze network packets using TCPDump (Linux) and Flow Monitor Capture (Cisco ASR). Implement multi-protocol routing solutions with BGP OSPF and VRF-based networks. Use Wireshark TCPDump and other diagnostic tools for network performance analysis. Perform TLS/SSL handshake troubleshooting and security configuration. Configure and maintain firewalls (Palo Alto Cisco) including security policies VPNs and intrusion prevention systems (IPS). Implement AAA technologies (Cisco ISE LDAP OTP) for access management. Ensure certificate management and encryption including TLS/SSL and OpenSSL operations. Install configure and troubleshoot digital certificates on F5 LTM/GTM/APM/ASM appliances. Implement F5 Client Constrained Delegation (C3D) for certificate delegation. Enable certificate-based authentication using Client-SSL profiles and APM policies. Deploy and maintain network monitoring alerting and repair systems in production environments. Troubleshoot BGP neighbor configurations VPNv4 unicast summary and OSPF network participation. Optimize and troubleshoot load balancing solutions and DNS-based traffic management. This position is designed to be flexible with responsibilities evolving to meet business needs and enable individual growth.

Requirements

Minimum 4 years of hands-on experience as a Network Administrator or Network Security Engineer. Ability to obtain a Secret clearance w/Tier 5 investigation Strong knowledge of OSI and TCP/IP network models TCP 3-way handshake and window scaling. Experience with Palo Alto and Cisco firewalls. Experience with F5 LTM GTM APM ASM for load balancing and security. Cisco Certified Network Professional (CCNP) certification or equivalent experience or willingness to get within 45 days of hire. Preferred Strong troubleshooting skills with routing protocols (BGP OSPF VRF LISP). Familiarity with network packet capture tools (TCPDump Wireshark). Understanding of essential network services (DNS SMTP NTP IMAP SNMP). Experience in TLS/SSL security OpenSSL and certificate management. Experience working with Unix/Linux-based systems. Experience with network automation (REST APIs Syslog XML SNMP). Experience deploying and troubleshooting load-balanced services and SSL certificate management. Why Work for Us? Core4ce is a team of innovators self-starters and critical thinkers—driven by a shared mission to strengthen national security and advance warfighting outcomes.

We offer

401(k) with 100% company match on the first 6% deferred with immediate vesting Comprehensive medical dental and vision coverage—employee portion paid 100% by Core4ce Unlimited access to training and certifications with no pre-set cap on eligible professional development Tuition assistance for job-related degrees and courses Paid parental leave PTO that grows with tenure and generous holiday schedules Got a big idea? At Core4ce The Forge gives every employee the chance to propose bold innovations and help bring them to life with internal backing. Join us to build a career that matters—supported by a company that invests in you. All qualified applicants will receive consideration for employment without regard to race color religion sex (including pregnancy) national origin disability veteran status age genetic information or other legally protected status.