Senior Systems Administrator

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

Required Skills

• 8+ years of systems administration experience spanning identity and access management, enterprise applications, and cybersecurity

• Deep hands-on experience with user lifecycle management, SSO (SAML/OIDC), and SCIM provisioning in the Microsoft ecosystem; Atlassian, privileged identity management, and Purview experience a plus

• Advanced PowerShell scripting, including Microsoft Graph, with Python or JavaScript for automation and API integrations

• Hands-on experience with SIEM/MDR platforms, security monitoring, and incident response, plus working knowledge of PKI; audit support, AI tool governance, and networking fundamentals a plus

• Self-directed communicator who balances ticket work against project deadlines without needing direction, and can support after-hours incident response when needed

• Medical, Dental, and Vision plans for employees and their families

• 10 Paid holidays, plus company-wide winter break

• Up to 5% employer 401(k) match

• Annual wellness stipend