Locations: Bay Area, RTP, Boulder


Horizon3AI is seeking a Senior Software Engineer to join our exceptional team of modern JavaScript engineers. As a Senior Software Engineer, you will work closely with our Engineering team to execute on our technical roadmap and contribute to the development of our product, NodeZero. This role requires hands-on experience with front-end technologies, especially React and TypeScript. If you thrive in a fast-paced, semi-structured environment, enjoy wearing multiple hats, and possess a problem-solving mindset, then this opportunity is perfect for you!

Roles and Responsibilities:

  • Build new features for our product, NodeZero, using React and TypeScript.
  • Gain in-depth understanding of the product, analyze logs, and troubleshoot errors to ensure smooth operation.
  • Review code and write tests to maintain high code quality and reliability.
  • Manage infrastructure and define best practices for the front-end development process.
  • Mentor and support the growth of junior engineers within the team.


  • Effective prioritization and time management skills for yourself and the team.
  • Self-starter mentality with the ability to identify and resolve problems with known risks and impacts.
  • Excellent analytical and problem-solving abilities to tackle complex challenges in front-end development.
  • Passion for designing and building accessible products that cater to all users.
  • Strong technical documentation and written communication skills to facilitate collaboration.


  • Must be a U.S. citizen and reside in the United States
  • Bachelor's degree in computer science, computer engineering, software engineering, or a related field.
  • 8+ years of experience working on production applications with real-world users.
  • Experience working with SaaS applications and in startup environments.
  • Proficiency in JavaScript, React, TypeScript, HTML/CSS, Git & GitLab.


  • Experience with GraphQL for efficient data retrieval and interaction.
  • Proficiency in Node.js for backend development.
  • Knowledge of WebSockets for real-time communication.
  • Familiarity with Webpack for bundling and optimizing front-end assets.
  • Experience with Monorepo for managing multi-package projects.
  • Knowledge of AWS (Amazon Web Services) to leverage their product suite.
  • Understanding of defensive and offensive cybersecurity concepts.


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: $125,000 - $195,000 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.


This position is instrumental in Horizon3AI's success, playing a critical role in building and maintaining the front end of our product, NodeZero. As a Senior Software Engineer, you will have the opportunity to mentor and guide junior developers while contributing to the growth and development of the team. If you are passionate about building accessible and secure products and meet the qualifications and experience listed above, 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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