Senior Network Security Engineer

The Senior Network Security Engineer at NAN is a senior-level technical expert responsible for the design, implementation, support, and optimization of highly complex network and security solutions. You will deploy and configure advanced technologies primarily based on Fortinet security products, along with enterprise routers, switches, Wi-Fi infrastructure, SD-WAN, and other connectivity solutions. Serving as a key resource on the engineering team, you will lead high-impact projects, troubleshoot intricate technical challenges, ensure customer satisfaction, and deliver solutions aligned with best practices. This role requires deep expertise in network security architecture (cloud and on-prem), exceptional problem-solving skills, and a commitment to ongoing customer support and technical excellence.

Design, Implementation & Deployment

Design, plan, configure, and deploy complex, multi-site network security solutions including Fortinet firewalls (FortiGate), switches (FortiSwitch), wireless solutions (FortiAP), SD-WAN deployments, and related network equipment and fabric-based technologies.

Lead large-scale security migrations and network infrastructure projects, ensuring efficient, secure, and seamless transitions for enterprise clients.

Conduct thorough testing and validation procedures, documentation, and training sessions to ensure successful handover and client satisfaction.

Technical Leadership & Support

Serve as a principal technical escalation point for advanced network security issues, troubleshooting and resolving critical incidents with urgency and precision.

Provide strategic guidance and technical mentorship to other engineers within the team, elevating the overall technical capability and ensuring adherence to best practices.

Engage directly with customers, clearly communicating complex technical solutions, issue resolutions, and recommendations in an accessible and customer-centric manner.

Participate in an on-call rotation on an as needed basis for escalations during nonstandard hours.

Perform regular assessments and optimization of client environments, proactively identifying opportunities for improvement in security posture, performance, reliability, and operational efficiency.

Keep up to date on new product features, industry developments, emerging security threats, and evolving network technologies to maintain industry-leading expertise.

Develop and maintain detailed technical documentation, including solution configurations, diagrams, operational procedures, and client-specific network documentation.

Collaborate closely with sales team and technical partners to ensure solutions remain aligned with original designs and client expectations, providing feedback and pre-sales engineering as necessary.

REQUIREMENTS

Required

Minimum of 8+ years of progressive experience in network security engineering, implementation, and technical support within MSSP, ISP, enterprise networking, or related industries.

Advanced hands‑on expertise implementing and supporting Fortinet solutions, including FortiGate firewalls, FortiSwitches, FortiAPs, and connected products such as FortiClient, FortiAuthenticator, FortiManager and FortiSASE.

Extensive knowledge and practical experience with enterprise networking technologies including switching, routing protocols, Wi-Fi architecture, SD-WAN, MPLS/VPLS, VPNs, and complex WAN deployments.

Proven track record successfully implementing large-scale migrations and complex network security projects for enterprise clients.

Strong troubleshooting skills with the capability to resolve complex network and security issues quickly and effectively.

Preferred

Industry‑leading certifications such as Fortinet NSE7/FCP, CCNP/CCIE, CISSP, or equivalent.

Bachelor's or Master’s degree in Computer Science, Information Technology, Engineering, or related discipline.

Experience with Extreme Networks, Cisco, Aruba, Juniper, Palo Alto Networks, or other relevant enterprise networking/security technologies.

WHAT WE OFFER

• Base Salary Range: $110,000 - $130,000
• 100% employer‑paid medical, vision, and dental insurance for Employees
• Out of pocket health expense allowance
• Company holidays and Unlimited PTO
• Wellness Stipend
• Sabbatical Leave
• Retirement Plan
• Professional Development Support & Incentives

This is a Hybrid Remote / On‑Site position. NAN's Engineering Offices and Corporate HQ are located in North Attleboro, MA. Preference will be given to candidates who can travel to the office 1-2 days per week.