Security Engineer

About the role

ABOUT FUSE

We are building one of the most potentially consequential companies of the century. Our mission is to accelerate the world's transition to fusion energy while safeguarding humankind. This is not a normal company. This is not a normal job. We are committed for the long term to win.

ABOUT THE ROLE

We're hiring our first dedicated Security Engineer to own security across a growing and technically diverse footprint: cloud infrastructure, software development practices, control systems, and data collection pipelines. You'll work alongside our IT Systems Administrator, who owns day-to-day device/identity operations - you'll set the security strategy, standards, and technical controls, and partner with them on enforcement. This role sits at the intersection of cloud security, DevSecOps, and OT/control-systems security with real ownership from day one.

WHAT WE VALUE

- Obsess about the details — sloppy work costs us later, so do it right the first time.

- Care — pick up the trash. Do things no one asks you to do. Go the extra mile because you care.

- Act with urgency — every hour matters more than it feels like it does.

- Be responsible for the outcome, not just the task; if it is not working, it remains your problem until it is fixed.

- Assume good intent — disagree openly, then commit fully once a call is made.

CORE RESPONSIBILITIES

- Own security posture for AWS infrastructure managed via Terraform and Spacelift, including IAM policy review, secrets management, and network segmentation.

- Partner with engineering to build security into the SDLC and CI/CD pipeline - code scanning, dependency/vulnerability management, secure defaults for new services.

- Assess and secure control systems and data collection infrastructure.

- Own and operate our security monitoring and detection tooling; triage alerts and build out detection coverage over time.

- Define access-control standards (conditional access, least privilege, MFA policy) in IdP and across SaaS tools; partner with IT Admin on enforcement.

- Define MDM security baselines (macOS/Windows) for IT to implement and maintain.

- Build and lead incident response efforts when issues arise.

- Track security risk across the environment and lay groundwork for relevant compliance frameworks as the company matures.

- Run periodic security awareness efforts (phishing simulations, training) for a non-security-native team.

MINIMUM QUALIFICATIONS

- 4+ years in a security engineering role spanning cloud security and application/DevSecOps work.

- Strong hands-on experience with AWS and Infrastructure-as-Code (Terraform).

- Practical experience with identity security — SSO/IdP policy (Okta or equivalent), conditional access, least-privilege design.

- Experience with a security monitoring/detection platform (SIEM, EDR, or specialized tools) — alert triage, tuning, investigation.