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GRAIL is a healthcare company pioneering early cancer detection technologies using next-generation sequencing and advanced computer science. This Senior Network Engineer role involves designing, implementing, and supporting enterprise network infrastructure across campus, laboratory, data center, manufacturing, and AWS cloud environments in a hybrid infrastructure setting. What You'll Do • Design, implement, and support enterprise network infrastructure across campus, laboratory, data center, manufacturing, and AWS cloud environments • Deploy, maintain, and troubleshoot Juniper and Aruba switching and routing infrastructure including Layer 2/Layer 3 networking, VLANs, routing protocols, and high availability • Configure, maintain, and optimize Palo Alto Networks firewalls, security policies, NAT, VPNs, GlobalProtect, and URL filtering • Design and support AWS networking services including VPCs, Transit Gateway, Route Tables, Security Groups, Network ACLs, and Site-to-Site VPNs • Develop infrastructure automation using Python, Ansible, Terraform, or PowerShell to improve provisioning and operational consistency • Build network monitoring, alerting, and dashboards using New Relic and other enterprise monitoring platforms • Investigate and resolve complex routing, switching, firewall, VPN, cloud networking, DNS, and DHCP issues across hybrid environments • Participate in on-call rotation supporting production infrastructure and contribute to disaster recovery planning and patching What You Need • 4+ years of experience designing, implementing, and supporting enterprise network infrastructure • 3+ years of hands-on experience with Juniper and/or Aruba enterprise networking platforms including switching, routing, and troubleshooting • 3+ years of experience managing Palo Alto Networks firewalls including security policies, NAT, VPNs, and threat prevention • 2+ years of hands-on experience with AWS networking services including VPCs, Transit Gateway, Route Tables, and hybrid cloud networking • Experience with enterprise routing and switching technologies including BGP, OSPF, VLANs, STP, LACP, VRRP, and Layer 2/Layer 3 troubleshooting • Experience developing infrastructure automation using Python, Ansible, Terraform, PowerShell, or similar Infrastructure as Code tools • Experience implementing network monitoring and observability platforms such as New Relic, SolarWinds, or Datadog • Strong troubleshooting skills across networking, cloud connectivity, VPNs, firewalls, DNS, DHCP, and network security • Experience working in Linux and Windows enterprise environments • Bachelor's degree in Computer Science, Information Technology, Engineering, or equivalent practical experience Nice to Have • Experience supporting hybrid cloud infrastructure across AWS and enterprise data centers • Experience with EVPN/VXLAN architectures and modern data center networking • Experience with AWS Direct Connect and hybrid networking architectures • Experience supporting Aruba CX switching platforms and Aruba Central • Experience managing enterprise VPN solutions including GlobalProtect • Experience implementing Infrastructure as Code using Terraform • Experience with Git-based version control and CI/CD pipelines for infrastructure automation • Experience supporting VMware vSphere environments and virtualization networking • Knowledge of DNS, DHCP, Active Directory, PKI, RADIUS, and enterprise authentication services • Experience supporting laboratory, biotechnology, healthcare, manufacturing, or regulated environments • Juniper (JNCIS/JNCIP), Aruba (ACSA/ACSP), Palo Alto (PCNSA/PCNSE), or AWS Associate certifications • Experience mentoring junior engineers and driving operational improvements through automation and best practices • Comfortable using modern AI-assisted engineering tools while applying sound engineering judgment