Senior Software Engineer, Browser Automation

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 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, the 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.

 

Summary

We're building an autonomous, black-box web application penetration tester. It crawls and attacks real production websites the way a skilled human pentester would, finding broken access control, injection, XSS, and more, under a strict production-safe, no-false-positives mandate. The hardest part of that job isn't the exploitation. The hardest part is reliably driving a real browser through messy, modern web apps at scale: logging in, navigating SPAs, surviving anti-bot defenses, and mapping every reachable surface without getting stuck or causing harm. That's the engine you'd own.

Essential Functions

- Help us grow and harden our browser automation and crawling engine, which is the layer that discovers, navigates, and interacts with target applications...