Get to Know Us

Horizon3 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 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 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.

What You’ll Do

The Senior Software Engineer will be joining the Platform Integration team — a high-impact group whose mandate is critical to the scalability of our platform. You’ll be responsible for building the systems and platforms behind a product that helps security teams cut through the noise and prioritize actually fixing the weaknesses that represent real risk in their environment. This role is for a senior individual contributor who leads through technical judgment, cross-functional partnership, and execution.

This nascent team helps push our existing APIs to be first-class citizens, building the consistent, well-documented foundation that powers every integration and allows customers to build their own agentic workflows atop our platform. No less critical, this team will build strategic integrations to unlock critical new features atop mountains of complimentary data from users own systems. We want to meet users where they are at with their current tooling, and use the products they already have in their ecosystem to drive the find-fix-verify loop with greater accuracy and less downtime.

What You’ll Be Responsible For

Develop core product features in ETL (Extract, Transform, Load) and GraphQL to support data processing and retrieval.

Design and implement backend APIs in GraphQL to facilitate data interactions between different components of the product.

Contribute production code, setting the standard for design quality, code quality, and operational rigor.

Collaborate with frontend team members to present data in a clear and user-friendly format, enhancing the product's user experience.

What You’ll Bring

Ability to own and manage concurrent initiatives, demonstrating effective judgment in prioritization and time management.

Driven, self-managed, capable of conceiving and implementing solutions on your own and with a team

A strong desire to continuously improve and learn new technologies in a fast-paced Agile development environment

Excellent analytical and problem-solving skills, effective communication, attention to detail and high-quality work

Strong technical documentation ability to support the development process.

Effective communication and collaboration with designers, developers, and product managers.

Ability and interest in mentoring junior and mid-level engineers to foster their growth and development.

Required Education / Experience

Bachelor's Degree in Computer Science, Computer Engineering or related field.

7+ yrs professional software engineering experience using modern object-oriented or functional languages (Python, Java, Go, Scala, C++, TypeScript, etc).

Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes.

What Sets You Apart

Expert proficiency in SQL and experience with various database architectures including relational (PostgreSQL) and graph (Neo4j).