Note: The job is a remote job and is open to candidates in USA. 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 and security, responsible for 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
Skills
- Minimum 4 years of hands-on experience as a Network Administrator or Network Security Engineer
- 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
- 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
Benefits
- 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.
Company Overview
Core4ce is a mission-oriented company that serves as a trusted partner to the national security community. It was founded in 2018, and is headquartered in Reston, Virginia, USA, with a workforce of 501-1000 employees. Its website is https://www.core4ce.com/.