Network Security Engineer

About the role

Cerebras Systems builds the world's largest AI chip, 56 times larger than GPUs. This architecture allows Cerebras to deliver industry-leading training and inference speeds; over 10 times faster than GPU-based hyperscale cloud inference services.

This order of magnitude increase in speed is transforming the user experience of AI applications, unlocking real-time iteration and increasing intelligence via additional agentic computation.

Cerebras works with the leading model labs, global enterprises, and cutting-edge AI-native startups. OpenAI recently announced a multi-year partnership with Cerebras, to deploy 750 megawatts of scale, transforming key workloads with ultra high-speed inference.

Cerebras is seeking a Network Security Engineer to build, operate, and secure the network infrastructure supporting our data centers, cloud environments, corporate network, and AI systems.

This is a hands-on individual contributor role based in Sunnyvale, CA, with regular on-site work in our data centers. You will work across network security and network operations, supporting firewalls, segmentation, routing and switching, network access, and automation.

Responsibilities

• Operate firewalls, ACLs, segmentation, and network security controls across data center, corporate, and AWS environments.
• Support hands-on data center network operations, including deployment, configuration, troubleshooting, maintenance, and lifecycle management.
• Implement and maintain segmentation, firewall, and ACL policies across corporate, compute, customer, and infrastructure environments.
• Manage inbound and outbound network controls, including public exposure, NAT, load balancers, DNS filtering, proxies, and egress policies.
• Implement and operate VPN, ZTNA, NAC, Wi-Fi, and vendor or partner connectivity.
• Perform recurring firewall rule reviews, segmentation audits, and remediation of unnecessary network exposure.
• Automate network and security workflows using Terraform, Ansible, GitOps, Python, and policy as code.
• Support network telemetry, detection, investigation, and containment in partnership with Security Operations.
• Troubleshoot routing, switching, TCP/IP, DNS, TLS, and cloud networking issues.
• Maintain network architecture documentation, procedures, and runbooks.

Skills and Qualifications

• 7+ years of experience in network security, network engineering, cloud security, or infrastructure security.
• Strong hands-on experience with firewalls, ACLs, segmentation, routing, switching, VPNs, and network troubleshooting.
• Experience operating data center and on-premises network infrastructure.
• Experience with AWS networking, including VPCs, transit gateways, security groups, and load balancers.
• Experience with Palo Alto, Juniper, Cloudflare, or similar platforms.
• Proficiency with Terraform, Ansible, Python, GitOps, or similar automation tools.
• Strong understanding of ZTNA, NAC, egress controls, TCP/IP, DNS, and TLS.
• Strong written communication and documentation skills.
• Ability to work regularly on-site in Sunnyvale, CA and perform hands-on work in data center environments.

Experience in several of the following is valuable

• AI, HPC, or large-scale compute environments.
• Data center networking and security.
• AWS network security and segmentation.
• ZTNA and VPN architectures.
• DNS filtering, SWG, proxy, or SASE platforms.
• Vendor and partner connectivity.
• Public exposure and attack surface remediation.
• Network detection and incident response.