Senior Systems Administrator

We are a fusion power company based in Everett, WA, with the mission to build the world's first fusion power plant, enabling a future with unlimited clean electricity. Our vision is a world with clean, reliable, and affordable energy for everyone. Since Helion's founding in 2013, we have raised $1.5 billion from long-time investors such as Sam Altman, Mithril, and Capricorn Investment Group as well as new investors including Thrive Capital, LightSpeed Venture Capital, SoftBank, and others to propel us forward. Our current prototype, Polaris, has reached record-breaking plasma temperatures of 150 million degrees Celsius (13 keV). Helion is continuing to iterate and on the path to the world's first fusion power plant, Orion. This is a pivotal time to join Helion. You will tackle real-world challenges with a team that prizes urgency, rigor, ownership, and a commitment to delivering hard truths – values essential to achieving what no one has before. Together, we will change the future of energy, because the world can't wait.

What You Will Be Doing

Be part of the team who keeps Helion's team securely connected as we build toward commercial fusion power. This is a hands-on, builder role for someone who would rather automate a problem away than ticket it twice. You'll support the identity, security, and application systems that everyone here depends on, including automation, integration, onboarding, migrations, and decommissioning.

Your week splits roughly evenly between support and project work, including both responding to real-time requests and performing planned and break-fix deployments. You'll join a small, tight-knit team, take on a meaningful share of its load, and bring the scripting depth to reduce manual work. You'll be a trusted technical partner to HR, Legal, GSOC, and business teams, with a seat at the table on access, governance, and risk, and you'll be on the front line when security events happen.

This role reports to the Manager, Identity and Access Management and Enterprise Applications and is based onsite in Seattle, WA, with one remote day per week.

You Will

Administer and support existing automation for the identity lifecycle (joiner, mover, leaver) for employees, contractors, and service accounts, using SSO, MFA, conditional access, SCIM/API-based provisioning, and PowerShell

Manage Entra ID, Active Directory, and Microsoft 365 identity services, enforcing least-privilege access and driving access reviews through remediation

Detect and respond to security events using Microsoft Sentinel, partnering with managed detection and response teams on escalations, log source tuning and remediation through to closure

Administer Microsoft 365 and Atlassian platforms, build integrations with REST APIs, webhooks, and middleware, and review new applications and AI tools for security before they enter the enterprise

Respond to end user issues and action requests captured in our Jira Service Management ticket queue that relate to identity, access, enterprise apps, and security

Produce process and procedure documentation and drive process improvement through effective analysis and collaboration with stakeholders