Senior Network Security Engineer

🔥 4 minutes ago

🇺🇸 United States – Remote

💵 $135k - $205k / year

⏰ Full Time

🟠 Senior

👮‍♂️ Cybersecurity / Security Engineer

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SimSpace

WebsiteLinkedInAll Job Openings

201 - 500 employees

Founded 2015

🔒 Cybersecurity

☁️ SaaS

🏛️ Government

🔥 Funding within the last year

💰 $39M Venture Round - SimSpace on 2025-10

Cybersecurity • SaaS • Government

SimSpace is a cybersecurity company that provides a realistic, intelligent cyber range platform for training, testing, and validating security teams, tools, and AI agents. Its platform enables live-fire exercises, threat emulation (full kill-chain and atomic), validation of controls and agentic workflows, and disaster recovery and compliance testing; it is used by enterprises and government customers to build cyber readiness and resilience. Founded by experts from U. S. Cyber Command and MIT Lincoln Laboratory, SimSpace focuses on upskilling individuals, strengthening teams, and evaluating AI-driven defenses in realistic, production-like simulations.

📋 Description

• Act as the subject matter expert for SimSpace network and network security infrastructure • Design, implement, support, and secure enterprise network infrastructure and software-defined networking solutions • Configure and maintain complex VMware environments leveraging NSX-T, DVS, and software-defined networking technologies • Contribute to the design and implementation of resilient, secure, and scalable network architectures • Configure and troubleshoot virtual networking, VLANs, VRFs, traffic forwarding, and hybrid cloud connectivity • Troubleshoot all levels of network connectivity issues including, but not limited to, network outages, switch failures, network performance, network interface card (NIC), cabling, TCP/IP configuration, etc. • Manage and optimize secure web access technologies including content filtering, secure web proxy, SSL inspection, DLP, and zero-trust remote access platforms • Administer next-generation firewall infrastructure, including firewall policies, ACLs, NAT, IPS/IDS, VPNs, routing, segmentation, and high-availability configurations • Manage web application firewall (WAF) and edge security technologies, including rulesets, custom protections, bot mitigation, and application-layer threat prevention • Perform troubleshooting of complex network and security incidents, including outages, performance issues, routing failures, VPN issues, and security events • Assist in vulnerability management activities for network and security infrastructure, including performing web application vulnerability assessments using DAST tools, coordinating remediation efforts, and validating corrective actions • Monitor network and security infrastructure performance and execute corrective actions as needed • Support centralized logging, security monitoring, alerting, and threat analysis activities across network and security platforms • Assess existing network and security technologies to identify opportunities for modernization, improved security posture, and operational efficiency • Maintain documentation, standards, and operational procedures for network and security infrastructure • Provide technical leadership, mentorship, and guidance to junior engineers and operational staff • Participate in maintenance activities, infrastructure upgrades, and business-driven technology projects

🎯 Requirements

• 8+ years of network engineering experience • 5+ years of hands-on network security or security infrastructure experience • Strong understanding of enterprise networking concepts, protocols, and infrastructure design • Strong knowledge of routing, switching, TCP/IP, DNS, VPNs, network segmentation, and secure remote access technologies • Experience managing next-generation firewalls, secure web gateways, WAFs, and zero-trust security platforms • Strong hands-on experience with firewall policy management, NAT, IPS/IDS, VPN technologies, and routing protocols including BGP • Strong understanding of web certificates, PKI, TLS/SSL encryption, certificate lifecycle management, and troubleshooting certificate-related connectivity or inspection issues • Experience with LAN/WAN design including IP allocations, segmentation, VLAN implementation, and hybrid cloud networking • Proficiency with packet captures, traffic analysis, and network troubleshooting methodologies • Experience with centralized logging, SIEM, security monitoring, alerting, and log analysis platforms to support threat detection and incident investigation • Familiarity with vulnerability management and security assessment tools • Experience with monitoring and observability platforms • Ability to lead technical implementations, infrastructure upgrades, and operational initiatives • Ability to quickly learn and adapt to new technologies and platforms • Strong written and verbal communication skills.

🏖️ Benefits

• Base salary range: $135,000 - $205,000 reflecting our confidence in your expertise and impact, with the opportunity for bonuses tied to company performance and individual contributions. • Comprehensive medical, dental, and vision benefits, plus savings plans—coverage starts on day one! • Access to company-paid counseling, coaching, and resources for you and your family through Spring Health. • Plan for your future with a 401(k)-retirement savings plan featuring a company match. • Take the time you need with unlimited vacation and dedicated health & wellness days. SimSpace provides flexible solutions to meet the diverse work-life needs of team members. • Paid leave plans to support you and your loved ones during life’s most important moments. • Equity stock options at hire, with annual performance-based grants—become an invested stakeholder in our shared success. • Earn $1,500–$3,500 for every qualified hire through our employee referral program. • Full- and partial- subsidized membership plans and equipment discounts to help you reach your personalized fitness goals. • Access a LinkedIn Learning membership to prioritize your personal and professional development. • Monthly reimbursements for meaningful connections with teammates through our SocialSpace Community. • Legal plan coverage, pet insurance, wellness reimbursements, and more to simplify life’s details.