Job DescriptionCore4ce is seeking a highly skilled Network Developer to maintain secure, scalable enterprise infrastructures through advanced automation and scripting. While grounded in traditional network engineering-including BGP, OSPF, and Palo Alto firewalls-your primary focus will be designing programmatic workflows to manage devices, F5 load balancers, and complex TLS/SSL configurations. This is a dynamic role for a strong scripter who excels at network packet analysis and thrives on transforming manual IT operations into automated, highly efficient systems.
Responsibilities- Design, create, and maintain automations to manage Enterprise network infrastructure.
- 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.
- Troubleshooting knowledge of 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/BIG-IP DNS/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.
- 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- Experience withnetwork automation/scripting (REST APIs, Bash/C-shell, Python).
- 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.
- Knowledge of routing protocols (BGP, OSPF, LISP).
- Experience with Palo Alto and Cisco firewalls.
- Experience with F5 LTM for load balancing and security.
- Familiarity with network packet capture tools (TCPDump, Wireshark).
- Experience in TLS/SSL security, OpenSSL, and certificate management.
- Experience working with Unix/Linux-based systems.
Preferred- Knowledge of Client Constrained Delegation (C3D).
- Knowledge of F5 ASM, APM, BIG-IP DNS.
- Understanding of essential network services (DNS, SMTP, NTP, IMAP, SNMP).
- Experience deploying and troubleshooting load-balanced services and SSL certificate management.
*Core4ce provides the listed pay range for this position as a general guideline only and not as a guarantee of compensation or salary. Final offers may take into account a variety of factors, including, but not limited to, job responsibilities, education, experience, knowledge, skills, abilities, internal equity, market data alignment, any applicable collective bargaining agreement, and other legal requirements. 
