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Salary: USD 142,000 - 162,000 / annual
Horizon3.ai is a fast-growing remote cybersecurity company that enables organizations to proactively find, fix, and verify exploitable attack vectors before criminals exploit them. The flagship product, NodeZero, delivers production-safe autonomous pentests and assessment operations that scale across internal, external, cloud, and hybrid cloud environments. The company was founded by a fusion of former U.S. Special Operations cyber operators, startup engineers, and cybersecurity practitioners.
You will own the controls that protect how the distributed workforce authenticates, communicates, and connects, while keeping the underlying network reliable and well-documented. This role is approximately 60% security, identity, and email systems and 40% network engineering. You will partner closely with Security and the Help Desk team to resolve escalated issues and keep network, identity, and email infrastructure aligned with company security standards.
Key responsibilities include:
- Administer and secure Okta (or equivalent IdP/SSO), managing authentication policies, access provisioning, and application integrations
- Architect, administer, and secure the company email/collaboration platform, including mail flow rules, spam/phishing filtering, DKIM/DMARC/SPF configuration, and data loss prevention policies
- Own operations, monitoring, and incident response for network, email, and identity security controls including firewall policy and threat detection
- Triage incidents and remediate or escalate per incident response procedures
- Collaborate across teams to resolve escalated connectivity issues, support onboarding/offboarding, and ensure infrastructure alignment with security standards
- Evaluate and recommend improvements to identity architecture, email security posture, and related tooling
- Administer and maintain network infrastructure: switches, routers, firewalls, and wireless access points while supporting a distributed workforce, including capacity planning and performance monitoring
- Design and implement network changes (VLANs, routing, firewall rule changes) with minimal business disruption
- Maintain accurate documentation of network topology, configurations, and email/identity security architecture
- Manage vendor relationships and support contracts for network, firewall, identity, and email security tooling
- Demonstrate commitment to integrity, process improvement, and customer satisfaction
REQUIREMENTS:
- 3–5 years of experience in systems administration, identity/security engineering, or network administration
- Experience supporting a distributed or remote-first workforce
- Hands-on experience administering an identity/SSO platform (e.g., Okta) in a production environment, including access policies and app integrations
- Experience configuring and maintaining email security controls, including SPF, DKIM, DMARC, and anti-phishing/anti-spam tooling
- Hands-on experience administering a cloud email/collaboration platform (Google Workspace, Microsoft 365, or similar)
- Hands-on experience administering enterprise network infrastructure (switches, routers, firewalls, VPN) in a production environment
- Working knowledge of network security principles, including segmentation, firewall policy management, and VPN architecture
- Experience troubleshooting complex network, identity, and email connectivity issues with minimal escalation
- Experience documenting configurations, architecture diagrams, and operational runbooks
- Ability to scope and manage moderately complex projects end-to-end with little to no direction
Required tech stack: Identity/SSO platform (Okta or similar), email security gateway/anti-phishing tooling (Proofpoint, Mimecast, or similar), email/collaboration platform (Google Workspace or Microsoft 365), enterprise firewalls (Palo Alto, Fortinet, or similar), routing and switching (Cisco, Meraki, or similar), network monitoring tools.
Desirable qualifications: Relevant certifications such as Security+, CCNA, CCNP, or Okta certifications; experience with SASE/SSE platforms or Zero Trust network architecture; experience automating identity, network, or email security tasks via scripting (Python, PowerShell, or similar); experience in high-growth SaaS or cybersecurity companies.
Note: This is a fully remote position that may require up to 15% travel.
