Senior Engineering Manager, Client Platform

Horizon3.ai; United States; Remote; USD 242,000 - 275,000; Full time

Benefits offered by this job

Remote work

Health, vision & dental coverage

Flexible vacation policy

Parental leave

Job summary

Horizon3.ai is a remote-first cybersecurity company delivering NodeZero autonomous pentests and scalable assessment workflows. We seek a Platform Leader to guide Go/Python/C++ based platform teams, defining architecture, security, and delivery practices at scale.

You will oversee multi-team engineering, own OTA delivery, secure software supply chains, and partner with product and security researchers to ship new autonomous capabilities across thousands of environments.

Qualifications

• Experience leading large, distributed Go/Python/C++ platforms.
• Expertise in containerized software and CI/CD pipelines.
• Proven ability to design and operate OTA update systems at scale.
• Strong security mindset for software supply chain and deployment in varied environments.

Responsibilities

• Lead and mentor engineering managers and teams across sub-teams.
• Own end-to-end CI/CD for NodeZero runner container images and SBOM generation.
• Architect and operate OTA update delivery across thousands of customer environments.
• Collaborate with Security Research to ship autonomous pentest capabilities.
• Act as Product Owner with product managers and customer success to manage the roadmap.

Skills

Go

Python

C++

Linux

CI/CD

Containerization

OTA updates

Team leadership

Security

Tools

Docker

Cosign

Notary v2

SBOM

Job description

Get to Know Us

Horizon3.ai is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find, fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZero™ 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 IT Ops/SecOps teams, consulting pentesters, and MSSPs and MSPs.

We are a fusion of former U.S. Special Operations cyber operators, startup engineers & operators, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools and 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.

As a remote first company, we require minimum 25Mbps consumer grade broadband connection.

What You'll Do

• Team Building & Culture: Build, mentor, and grow Client Platform to ~10 engineers across Image Build & Release and OTA Services. You will directly manage the Engineering Managers of both sub-teams and set the technical and cultural direction for the full org. Establish engineering norms and a culture of ownership for a team whose software runs in environments you cannot control.
• Image Build & Release: Lead end-to-end CI/CD workflows to create, sign, and reliably publish the NodeZero runner container image. Own software supply chain security: reproducible builds, image signing, SBOM generation, and vulnerability scanning in CI.
• OTA Services: Architect and operate the over-the-air update delivery system that keeps NodeZero runners current across thousands of customer environments — reliably, securely, and without requiring manual customer IT intervention.
• Security Research Partnership: Collaborate closely with Security Research to ensure the runner seamlessly executes new autonomous pentest capabilities as they ship.
• Act as a Product Owner: Partner with product managers, security researchers, and customer success to manage the client-side roadmap.

What You'll Bring

Platform Leadership & Architecture

• Demonstrated expertise leading teams that design, build, and operate containerized software (Docker, VM images) deployed into on-premise or customer-managed environments.
• Experience implementing robust software supply chain practices — secure builds, image signing (cosign, Notary), reproducible builds, and vulnerability scanning in CI.
• Experience designing and operating OTA update mechanisms for distributed agents or edge software at scale — including staged rollouts, rollback, and delivery verification.
• Ability to reason about correctness in opaque, customer-controlled environments where you cannot observe failure modes directly.

Team Building & Engineering Culture

• Experience building or significantly growing an engineering team — including hiring, onboarding, and establishing engineering norms tailored for shipped software.
• Proven ability to define and instill engineering culture: rigorous code review standards, robust testing across diverse customer environments, and a strong culture of ownership.
• Drives high-impact architecture decisions rigorously — requires design documents, runs structured reviews, builds consensus, and ensures decisions account for customer environment variables.

Technical Expertise

• Proficient in Go (preferred), Python, or C++.
• Strong Linux OS-level operations: container runtimes, networking in corporate environments, systemd, process isolation.
• Experience with CI/CD pipelines for building and signing container images (cosign, Notary v2, or equivalent).
• Familiarity with OTA update protocols and frameworks: TUF (The Update Framework), Omaha, or custom mechanisms.
• Understanding of TLS, certificate pinning, and secure software delivery in hostile network environments.

Nice to Haves

• Exposure to cybersecurity, pentesting tools, or vulnerability remediation.
• Experience with cross-platform agents (Windows/Linux) and endpoint telemetry.
• Background in software running in air-gapped or restricted network environments.
• Familiarity with SLSA supply chain security framework.

Travel Required

We are a fully remote company, and this job may require up to 5% 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: $242,250 - $275,000 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills.
• Additional compensation: This role may also be eligible for an equity package (in the form of stock options). If any other compensation benefits apply, they will be discussed during the interview process.

Perks of Horizon3.ai

• 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.
• Remote Work: We are a 100% remote company. Enjoy the flexibility to work in the way that supports you and brings out your best.
• Competitive Compensation: We offer competitive salary and benefits which includes health, vision & dental care for you and your family, a flexible vacation policy, and generous parental leave.

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, 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

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