Payroll Administrator

About this role

Get to Know Us

Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs.

We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, false positives resulting in alert fatigue, blind spots, "checkbox” security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results.

THE OPPORTUNITY

Horizon3 http://Horizon3.ai is seeking a detail-oriented, service-minded Payroll Administrator to support our U.S. and international payroll operations. This role will help ensure employees are paid accurately and on time while providing responsive support for payroll questions and maintaining high standards for data integrity, confidentiality, and compliance.

The ideal candidate brings strong attention to detail, a customer-service mindset, and the ability to manage recurring payroll responsibilities in a fast-paced, evolving environment. This person will partner closely with People and Finance teams and will have the opportunity to help strengthen scalable payroll and HR operations as the company grows.

What You’ll Do

- Assist with the regular processing of payroll for U.S. and international employees.

- Serve as a first point of contact for employee questions related to paychecks, taxes, deductions, direct deposit, garnishments, and other payroll matters.

- Provide timely, accurate, and high-quality customer service while resolving payroll questions and issues.

- Review and audit payroll data, including hours worked, pay rates, deductions, and other employee information, to identify and correct discrepancies.

- Support payroll-related onboarding and offboarding activities.

- Maintain accurate employee payroll records and protect data integrity across HRIS and payroll systems.

- Assist with payroll adjustments, corrections, off-cycle payments, and other special payroll requests as needed.

- Help support compliance with applicable federal, state, local, and international payroll requirements.

- Partner with People and Finance teams to investigate and resolve payroll discrepancies.

- Support year-end payroll activities, including W-2 distribution and related employee communications.

- Maintain organized documentation and contribute to continuous improvement of payroll processes and controls.

What You’ll Bring

- 1–3 years of customer service, payroll, HR operations, accounting operations, or related experience.

- Basic knowledge of payroll processes and terminology, including taxes, deductions, garnishments, direct deposit, and payroll adjustments.

- Strong attention to detail, accuracy, and follow-through.

- Excellent written and verbal communication skills with a solutions-focused approach.

- Ability to handle sensitive and confidential employee information with discretion.

- Proficiency in Microsoft Excel and the ability to learn payroll, HRIS, and other business systems quickly; advanced spreadsheet skills are a plus.

- Ability to manage multiple priorities, meet deadlines, and maintain consistent quality in a fast-paced environment.

- Associate’s or bachelor’s degree in Human Resources, Accounting, Business, or a related field is preferred.

CORE COMPETENCIES

- Customer service mindset

- Attention to detail and data accuracy

- Accountability and ownership

- Confidentiality and sound judgment

- Team collaboration

- Organization and time management

- Problem-solving and follow-through

- Comfort working independently in a remote environment

WHY JOIN US

- Opportunity to grow within Payroll and People Operations.

- Collaborative and supportive team environment.

- Exposure to end-to-end payroll processes across U.S. and international populations.

- Opportunity to help build efficient, scalable payroll processes at a high-growth cybersecurity company.

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.

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…