Senior IT Systems Engineer

Must have hands-on experience administering an identity/SSO platform (e.g., Okta) in a production environment, including access policies and app integrations

Must have experience configuring and maintaining email security controls, including SPF, DKIM, DMARC, and anti-phishing/anti-spam tooling

Must have experience administering a cloud email/collaboration platform (Google Workspace or Microsoft 365, or similar)

Must have hands-on experience administering enterprise network infrastructure (switches, routers, firewalls, VPN) in a production environment

Must have working knowledge of network security principles, including segmentation, firewall policy management, and VPN architecture

Must have experience troubleshooting complex network, identity, and email connectivity issues with minimal escalation

Must have experience documenting configurations, architecture diagrams, and operational runbooks

Must be able to scope and manage moderately complex projects end-to-end with little to no direction

Must have experience supporting a distributed or remote-first workforce

3–5 years of experience in systems administration, identity/security engineering, or network administration

Experience supporting a distributed or remote-first workforce

Required Tech Stack Experience

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)

Routing and switching (e.g., Cisco, Meraki, or similar)

Network monitoring tools

What Sets You Apart?

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

Travel Required

We are a fully remote company, and this job may require up to 15% of travel to be successful.

Compensation and Values

At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations.

In accordance with various State’s transparency regulations, we provide the following salary range information for this position:

Base salary range: $142,000 - $162,000 annually. The exact salary will be determined based on the selected candidate’s location, qualifications, experience, and relevant skills.

Additional compensation: All full-time roles are eligible for an equity package in the form of stock options.

Perks of Horizon3

Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive.

Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities.

Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking.

Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence.

Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave.

Base salary range [or Total On-Target Compensation]: $XX - $XX annually. The exact salary will be determined based on the selected candidate’s location, qualifications, experience, and relevant skills.

You Belong Here

Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, hair length or any other legally protected status by law.

Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth.

We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless.

Other Duties

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.

Application Note

In any materials you submit, you may redact or remove age-identifying information such as age, date of birth, or dates of school attendance or graduation. You will not be penalized for redacting or removing this information.