Senior IT Security & Network Engineer (Remote)

Horizon3; United States; Remote; USD 142,000 - 162,000; Full time

Benefits offered by this job

Inclusive Team

Growth Opportunities

Innovative Culture

Hybrid & Remote Work

Competitive Compensation

Job summary

Horizon3 is a fully remote cybersecurity company seeking an IT Systems Engineer with a passion for networking. You will own identity, email security, and network controls for a distributed workforce, approximately 60% security and 40% networking.

You will manage Okta, email security posture, and network infrastructure, collaborating with Security and Help Desk to resolve issues and document configurations in a cloud-first environment.

Qualifications

• Hands-on experience administering an identity/SSO platform (e.g., Okta) in production.
• Experience configuring email security controls (SPF, DKIM, DMARC) and anti-phishing tooling.
• Experience administering cloud email/collaboration platforms (Google Workspace or Microsoft 365).
• Hands-on experience administering enterprise network infrastructure (switches, routers, firewalls, VPN).
• Knowledge of network security concepts including segmentation, firewall policy management, and VPN architecture.

Responsibilities

• Administer and secure Okta (or equivalent IdP/SSO), managing authentication policies, access provisioning, and integration with downstream applications
• Architecting, administering and securing 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 elevate per incident response procedures
• Collaborate across teams (Security and Help Desk) to resolve escalated connectivity issues, support onboarding/offboarding, and ensure infrastructure remains aligned 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 also supporting a distributed workforce, including capacity planning and performance monitoring
• Design and implement network changes (VLANs, routing, firewall rule changes) with minimal disruption to business operations
• 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 a commitment to integrity, process improvement, and customer satisfaction

Skills

Identity/SSO admin

Email security

Network engineering

Remote-work support

Vendor management

Tools

Okta

Email security (Proofpoint/Mimecast)

Google Workspace / MS 365

Enterprise firewalls (Palo Alto/Fortinet)

Routing & Switching (Cisco/Meraki)

Network monitoring tools

Job description

Horizon3 is a fully remote cybersecurity company seeking an IT Systems Engineer with a passion for networking. You will own identity, email security, and network controls for a distributed workforce, approximately 60% security and 40% networking.

You will manage Okta, email security posture, and network infrastructure, collaborating with Security and Help Desk to resolve issues and document configurations in a cloud-first environment.