Senior Offensive Security Consultant

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.

JOB TITLE: SENIOR OFFENSIVE SECURITY CONSULTANT (RED TEAM / PENETRATION TESTER)

LOCATION: REMOTE (UNITED STATES) TRAVEL:MINIMAL (OCCASIONAL COMPANY OR CLIENT MEETINGS, OR ONSITE REQUIREMENTS, <10%) CITIZENSHIP REQUIREMENT: U.S. CITIZEN (REQUIRED FOR STATE AND LOCAL GOVERNMENT OPPORTUNITIES)

ROLE SUMMARY

We’re looking for a Senior Offensive Security Consultant with deep, hands-on experience leading end-to-end penetration testing and red team engagements. In this role, you’ll assess real customer production environments — including internal networks, web applications, and cloud infrastructure — to uncover vulnerabilities, validate attack paths, and deliver clear, actionable risk insights.

You will primarily lead remote engagements (1–2 weeks in duration) that include both pure red team exercises and compliance-focused testing (PCI DSS, SOC 2, etc.). You’ll combine strong technical tradecraft with excellent communication skills to help customers understand and address their security risks.

KEY RESPONSIBILITIES

- Lead full-scope penetration testing and red team engagements from scoping through final reporting.

- Perform in-depth testing of internal networks, web applications, APIs, cloud environments, and external attack surfaces.

- Identify and safely demonstrate business-logic flaws, edge cases, and high-impact attack chains that automated tools often miss.

- Review and validate findings from automated platforms, reproducing issues manually where needed.

- Deliver high-quality, client-ready reports with clear risk ratings, business impact, and practical remediation guidance.

- Collaborate with sales, customer success, and engineering teams to translate findings into product improvements.

- Mentor junior consultants and contribute to methodology, tooling, and process enhancements.

- Support compliance-driven assessments while maintaining an offensive security mindset.

REQUIRED EXPERIENCE & QUALIFICATIONS

- 5–10 years of current, hands-on experience in offensive security, red teaming, or penetration testing.

- Strong background in web application penetration testing and internal network assessments.

- Experience with compliance-focused engagements (PCI DSS, SOC 2, etc.).

- U.S. Citizen (required).

- Excellent written and verbal communication skills, including the ability to explain complex technical issues to both technical and executive audiences.

TECHNICAL TOOLING EXPERTISE

You should be highly proficient with modern offensive security tooling, including:

Web Application & API Testing (Core Focus):

- Burp Suite Professional (essential — Repeater, Intruder, Scanner, Extensions, and advanced workflows)

- OWASP ZAP

- Postman / API testing tools

- SQLMap, NoSQLMap, GraphQL tools

Internal Network & Active Directory:

- CrackMapExec

- BloodHound / SharpHound

- Impacket suite

- Responder, NTLMRelayX

- Metasploit Framework

Cloud & Infrastructure:

- Pacu, Scout Suite, Prowler

- AzureHound, RoadRecon

General Exploitation & Productivity:

- Cobalt Strike / Sliver / Covenant (C2 frameworks)

- Nmap, Masscan

- John the Ripper / Hashcat

- Custom scripting (Python, PowerShell, Bash)

Reporting:

- Strong experience writing professional security reports

WHAT MAKES YOU STAND OUT

- Passion for the craft of penetration testing and finding what automation misses.

- Experience with AI-assisted testing or agentic workflows.

- Published research, blog posts, or community contributions.

- Relevant certifications (OSCP, OSCE, CRTP, OSEP, GXPN, etc.).

WHAT WE OFFER

- Fully remote role with flexible scheduling.

- Opportunity to work on diverse, meaningful engagements.

- Competitive compensation and benefits.

- Professional development support (tools, training, conferences).

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, r

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