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Senior Back End Engineer

Job in Netherlands, Pemiscot County, Missouri, USA
Listing for: Horizon3 AI
Full Time position
Listed on 2026-02-28
Job specializations:
  • Software Development
    Software Engineer, Backend Developer, Cloud Engineer - Software
Salary/Wage Range or Industry Benchmark: 100000 - 125000 USD Yearly USD 100000.00 125000.00 YEAR
Job Description & How to Apply Below
Location: Netherlands

Get to Know Us

Horizon
3.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 NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. Node Zero 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/Sec Ops 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 25

Mbps consumer grade broadband connection.

What You’ll Do

The Senior Backend Engineer will be joining one of our world-class software engineering teams, and will be a key contributor to both user-facing product launches as well as platform enhancements and stability.
* This job description covers roles available across multiple teams. During the interview process, we’ll work with you to determine the best team fit based on your experience, interests, and career goals.

Responsibilities
  • Develop core product features in ETL (Extract, Transform, Load) and Graph

    QL to support data processing and retrieval.
  • Design and implement backend APIs in Graph

    QL to facilitate data interactions between different components of the product.
  • Build and maintain ETL pipelines for efficient data processing and analytics.
  • 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++, Type Script, etc).
  • Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes.
  • Expert proficiency in SQL.
Preferred Education/Experience
  • Experience with various database architectures including relational (Postgre

    SQL) and graph (Neo4j).
  • Experience building Graph

    QL backends.
  • Experience managing and maintaining production infrastructure.
  • Experience building platform capabilities for internal teams.
Travel Required

We are a fully remote company with a strong preference for candidates in the Bay Area. 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…

Position Requirements
10+ Years work experience
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