# Senior IT Systems Engineer at Horizon3.ai

- Company: Horizon3.ai
- What the company does: Horizon3 uses real-world attacks to safely show what attackers can actually do in your environment—so you can fix and prove what matters. Backed by NEA.
- Company website: https://horizon3.ai/
- Type: Startups (AI role)
- Level: Senior
- Location: US, Remote
- Work setup: Remote
- Pay: $142K to $162K base salary per year (USD)
- Posted: 2026-09-29
- Apply by: 2026-11-13
- Apply: https://jobs.ashbyhq.com/horizon3ai/fd069390-47ba-46cf-9777-a1d928fc2a64?utm_source=1752vc&utm_medium=careers
- Page: https://www.1752.vc/careers/jobs/horizon3-ai-senior-it-systems-engineer/

## About the role

We are seeking a security-minded IT Systems Engineer with a genuine passion for networking — someone equally comfortable hardening identity and email infrastructure as they are managing routing and firewall policy. This role is roughly 60% security, identity, and email systems and 40% network engineering. Found on 1752vc Careers, the job board for startup and VC roles.

## What they're looking for

- 3–5 years of experience in systems administration, identity/security engineering, or network administration
- Experience supporting a distributed or remote-first workforce
- Identity/SSO platform (e.g., Okta, or similar)
- Email security gateway / anti-phishing tooling (e.g., Proofpoint, Mimecast, or similar)
- Email/collaboration platform (Google Workspace or Microsoft 365, or similar)
- Enterprise firewalls (e.g., Palo Alto, Fortinet, or similar)

Tags: Security and IT

Source: 1752vc Careers, https://www.1752.vc/careers/jobs/horizon3-ai-senior-it-systems-engineer/