This is a contract position for a Network Security Engineer to support and maintain enterprise network infrastructure across multiple sites and data centers. Based in Marlborough, Massachusetts, this role offers a 6+ month engagement and requires participation in a 24x7 on-call rotation, with travel of up to 25%. Responsibilities Manage enterprise firewalls, including rule creation, policy reviews, security hardening, and change management Configure, monitor, and troubleshoot routing and switching infrastructure Support multi-site network environments and remote locations Perform vulnerability assessments and network security scans Manage centralized logging, monitoring, and alerting systems Maintain security patching for firewalls, routers, switches, network appliances, and monitoring tools Administer application delivery and load-balancing platforms Provide support for remote sites and data centers, including "smart hands" support for network and infrastructure equipment Rack and stack network hardware Upgrade IOS on networking equipment Manage network backup and recovery processes Participate in disaster recovery activities Monitor system performance, availability, and capacity Investigate and resolve network or infrastructure outages Review system and application logs Troubleshoot hardware and software issues Work with vendors to resolve technical issues and support compliance initiatives Ensure compliance with

NERC CIP

standards Create and maintain network diagrams, topology maps, configuration documentation, and operational procedures using Visio Qualifications Required Bachelor's degree in a related field or equivalent combination of education and experience 3+ years of experience in Network Engineering, Network Security, or Infrastructure Support Hands-on experience with firewalls, routers, and switches Knowledge of routing protocols and TCP/IP networking Experience with VLANs, DNS, DHCP, and SNMP Familiarity with VPN technologies Experience with network monitoring and logging tools Understanding of network security best practices Experience with vulnerability scanning and remediation Knowledge of backup and recovery processes Proficiency with Visio for documentation Strong troubleshooting and analytical skills Excellent written and verbal communication Ability to work independently and collaboratively Experience supporting teams across multiple time zones Comfort working in fast-paced environments with competing priorities Preferred Enterprise firewall administration experience Experience with load balancing and application delivery platforms Familiarity with Syslog and centralized monitoring tools Packet capture and traffic-flow analysis skills Disaster recovery planning and execution experience Experience with configuration management and change control processes Network testing and automation knowledge