Network Security Engineer

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