ABOUT RADIANT

Radiant is an El Segundo CA-based startup building the worlds first mass-produced portable nuclear microreactors. The companys first reactor Kaleidos is a 1-megawatt fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals data centers remote sites and military bases. Radiants unique practical approach to nuclear development leverages modern software engineering to rapidly deliver safe factory-built microreactors that use existing well-qualified materials. Founded in 2020 Radiant is on track to test its first reactor at the Idaho National Laboratory this summer with initial customer deliveries beginning in 2028.

SENIOR NETWORK SECURITY ENGINEER

Radiant is looking for a hands-on Senior Network Security Engineer to own our network infrastructure as we scale. You will be the primary architect and administrator for our network security fabric bridging our on-premise locations with our growing cloud footprint. This is not a maintain the lights role you will lead critical infrastructure initiatives immediately including migrating core services to a colocation facility (Equinix) and redesigning our site-to-site connectivity using Fortinet SD-WAN.

Responsibilities and Duties

• Lead the design and implementation of moving on-premise servers and network gear to a secure Equinix datacenter cage; ensure high-availability connectivity between the datacenter HQ and warehouse sites.

• Serve as the Subject Matter Expert (SME) for our Fortinet stack manage and optimize FortiGate firewalls (HA pairs) FortiSwitch and FortiAP.

• Design and manage secure connectivity (VPN/Direct Connect) between our physical infrastructure and cloud environments (AWS/Azure)

• Manage complex routing protocols (BGP OSPF) to ensure seamless failover and optimal traffic paths across our SD-WAN fabric.

• Implement Zero Trust principles manage VLAN segmentation and monitor threats using FortiAnalyzer or similar tools.

Required Qualifications and Skills:

• 5 years of network engineering experience with a heavy focus on security and hybrid environments

• Deep hands-on experience with FortiOS comfortable configuring HA clusters VDOMs and SD-WAN rules from scratch (NSE 7 certification is a strong plus)

• Solid understanding of cloud networking constructs including VPCs VNETs Transit Gateways and Security Groups

• Willingness to be hands-on with hardware when necessary racking cabling and physically configuring devices in the datacenter

• Ability to troubleshoot complex connectivity issues spanning the physical layer ISP routing and cloud firewalls

Desired Qualifications and Skills:

• Experience connecting distributed sites (e.g. warehouses remote offices) via SD-WAN

• Background in regulated or high-security industries

• Experience with network automation tools such as Ansible Terraform or Python

Additional Requirements:

• Must work 100% onsite at El Segundo HQ.

• Must be willing to work extended hours and weekends as necessary to accomplish our mission.

Benefits and Perks

• Stock: Substantial incentive stock plan for all full-time employees.

• Medical: 100% up to base silver level plan for employee 50% dependents offers up to Platinum plans.

• One Medical: Sponsored memberships for employees and their dependents.

• Vision: 100% top tier plan coverage 50% for dependents.

• Dental: 100% top tier plan coverage orthodontia extra 50% for dependents.

• Voluntary life accident hospital critical illness commuter and FSA/HSA are offered as employee contributed benefits.

• 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.

• Daily catered lunch. Free snacks and drinks.

• Flexible PTO policy. Remote workday allocation.

• Company and team-bonding events happy hours and in-person camaraderie.

• Beautiful El Segundo headquarters close to the Pacific Ocean.

Total Compensation and Benefits
Radiant compensates people for impact and invests in those who continue to raise the bar. Radiants new hire compensation package includes base salary substantial equity grants and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance experience education and qualifications and are designed to support continued growth as scope responsibility and impact expand at Radiant.

The best of todays advanced reactor builders dont wait for job postings. They join the winning team. If thats you contact us directly for immediate opportunities: .

We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race color religion sex sexual orientation gender identity or expression pregnancy age national origin disability status genetic information protected veteran status or any other characteristic protected by law.

Unfortunately we are unable to provide visa sponsorship at this time.

This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicants capacity to serve in compliance with U.S. export controls.

Required Experience:

Senior IC