Senior IT Systems Administrator: Automation, Security & Scale

Mosaic.tech; Mountain View (CA); Hybrid; USD 80,000 - 110,000; Full time

Benefits offered by this job

Healthcare benefits

FSA

Flexible schedule

EAP

PTO & parental leave

Team events

Internet reimbursement

Job summary

Harness in Mountain View, CA is seeking a Senior IT Systems Administrator to own, scale, and secure the corporate IT environment. This hands-on senior IC role focuses on identity, SaaS platforms, device management, automation, and security in a fast-growing, global company.

The ideal candidate has 5+ years in a similar role, experience supporting 1,000+ end users across multiple locations, and a proven ability to operate independently while driving automation and security-first initiatives.

Qualifications

• 5+ years in a similar role in a growing or enterprise environment.
• Experience supporting 1,000+ end users across multiple locations.
• Proven ability to operate independently and own systems without heavy oversight.

Responsibilities

• Administer identity and access management platforms (Okta, SSO, SCIM, lifecycle workflows).
• Manage and optimize SaaS applications (Google Workspace, Microsoft 365, Atlassian, Slack, etc.).
• Lead device management for macOS and mobile platforms using MDM solutions (Kandji, ManageEngine).
• Design, build, and maintain automation workflows using Workato, BetterCloud, Okta Workflows, and similar tools.
• Maintain a security-first mindset across identity, endpoints, SaaS, and access controls.
• Lead and execute IT projects from design through delivery.
• Provide Tier-3 level troubleshooting and escalation support.
• Create and maintain documentation, runbooks, and knowledge base articles.

Skills

IAM platforms

SaaS administration

MDM administration

Automation tooling

Security mindset

Documentation

Tools

Okta

Google Workspace

Microsoft 365

Atlassian

Slack

Kandji MDM

Job description

Harness in Mountain View, CA is seeking a Senior IT Systems Administrator to own, scale, and secure the corporate IT environment. This hands-on senior IC role focuses on identity, SaaS platforms, device management, automation, and security in a fast-growing, global company.

The ideal candidate has 5+ years in a similar role, experience supporting 1,000+ end users across multiple locations, and a proven ability to operate independently while driving automation and security-first initiatives.