Locations: Bay Area, RTP, Boulder


Horizon3AI is seeking a Senior Backend Engineer to join our dynamic Backend/Data Engineering Team. As a Senior Backend Engineer, you will play a crucial role in bridging the gap between our Attack Team and UI/UX Team by developing and maintaining various components on the product backend. This includes building core product features, creating backend APIs in GraphQL, developing ETL pipelines and BI stack, and conducting data analysis and enrichment. Your technical expertise and structured thinking will contribute to presenting data in a comprehensible and compelling format to enhance our product's capabilities.

Roles and Responsibilities:

  • 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.
  • Build and maintain ETL pipelines and the BI (Business Intelligence) stack for efficient data processing and analytics.
  • Conduct data analysis and enrichment to extract valuable insights from the data generated during penetration tests.
  • Collaborate with the UI/UX Team to present data in a clear and user-friendly format, enhancing the product's user experience.
  • Own and manage concurrent initiatives, demonstrating effective judgment in prioritization and time management.
  • Demonstrate creativity, self-motivation, and strong analytical and results-oriented skills in your work.
  • Maintain comprehensive technical documentation to support the development process.
  • Foster effective communication and collaboration with designers, developers, and product managers.
  • Mentor and provide guidance to junior and mid-level engineers to foster their growth and development.


  • Strong technical documentation and structured thinking to ensure efficient development processes.
  • Effective communication and collaboration skills to work seamlessly with cross-functional teams.
  • Ability to mentor and guide junior and mid-level engineers to foster a collaborative and learning-oriented environment.
  • Proficiency in SQL and experience with various database architectures, including relational (PostgreSQL) and graph (Neo4j).
  • Experience in building GraphQL backends for efficient data retrieval and interaction.
  • Knowledge of data engineering, analytics, enrichment, and visualizations to enhance data processing capabilities.
  • Driven, self-managed, and capable of conceiving and implementing solutions individually and as part of a team.
  • Strong desire to continuously improve and learn new technologies in a fast-paced Agile development environment.
  • Excellent analytical and problem-solving skills, attention to detail, and commitment to delivering high-quality work.

Required Education/Experience/Work Authorization:

  • Bachelor's Degree in Computer Science, Computer Engineering, or a related field.
  • 5+ years of professional software engineering experience using modern object-oriented or functional languages (Python, Go, Scala, C++, TypeScript, etc).
  • Experience building SaaS applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies like Docker and Kubernetes.
  • Must be a U.S. citizen and reside in the United States.


  • Expert proficiency in SQL and experience with various database architectures, including relational and graph databases.
  • Experience building GraphQL backends to enhance data interactions and retrieval.
  • Knowledge of data engineering, analytics, enrichment, and visualizations to optimize data processing.
  • A strong desire to continuously improve and learn new technologies in a fast-paced Agile development environment.

Why H3

  • Competitive Compensation: We offer a highly competitive salary and benefits package.
  • Growth Opportunities: Be part of a dynamic and growing team with numerous career advancement opportunities.
  • Innovation-Driven Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking.
  • Flexible Work Environment: Enjoy the convenience and work-life balance that comes with remote work.
  • Inclusive and Diverse Team: We value diversity and promote an inclusive culture where everyone can thrive.

Compensation Disclosure:

In accordance with various State’s transparency regulations, we provide the following salary range information for this position:

  • Base salary range: $143,000 - $184,000 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 performance bonuses, equity options, and other benefits which will be discussed during the interview process. 

We are committed to pay equity, fairness, and transparency. All candidates will be evaluated based on their skills, experiences, and potential contributions without regard to race, gender, age, or any other protected status.

Horizon3.ai is an equal opportunity employer and is committed to providing a work environment that is free from discrimination and harassment. We do not discriminate based on 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.

We encourage all qualified candidates to apply for open positions with our company and welcome candidates from all backgrounds and experiences. We are committed to providing equal employment opportunities to all employees and applicants for employment and will make reasonable accommodations to enable individuals with disabilities to perform the essential functions of their roles.

Joining Horizon3AI as a Backend Engineer offers an exciting opportunity to work on cutting-edge technologies and contribute to the development of innovative products in the cybersecurity industry. If you have a passion for backend development, data engineering, and driving impactful results, we encourage you to apply and become an essential part of our mission to enhance cybersecurity capabilities and protect our clients from emerging threats.


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