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Senior Frontend Software Engineer

Horizon3 AIUnited StatesRemote
This job is no longer open

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 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.

As a remote first company, we require minimum 25Mbps consumer grade broadband connection.

What You’ll Do


You'll be joining an excellent and enthusiastic team of modern javascript engineers. You will work closely with our Engineering team to execute on our technical roadmap to ship new features and products. You'll be expected to hit the ground running, working hands-on with our front-end codebase. You will build features, review code, write tests, maintain infrastructure, and help define best practices. This role is for you if you thrive in fast-paced, high-velocity environments that require you to wear many hats, think on your feet, and are excited about mentoring and growing junior members of the team.We work almost entirely in Typescript.

Our applications are built in React, and backend in Python. We're built on AWS, so familiarity with their product suite is a major plus.


  • Build features - UI/UX components and UI/UX features for our core NodeZero enterprise SaaS Platform.

  • Review Code - review your code and other engineers' code, implement best practices, and maintain high-quality code across the team. 

  • Write tests - own and write unit tests for every feature that you own.

  • Maintain infrastructure - ensure the application runs smoothly and performs well while adhering to CI/CD best practices.

  • Play a technical leadership role for your stream/team while developing features. You will lead and guide technical product requirements and maintain cross-functional collaboration and communication.

  • Mentor, train, and help junior members of the team grow.

What You’ll Bring 



  • BS in an Engineering discipline or equivalent technical degree.

  • 7+ years working on production applications with real-world users.

  • Experience collaborating with designers, developers, and product managers.

  • Experience managing and maintaining production infrastructure.

  • High growth, fast-paced, startup (or similar) experience building products and features from the ground up – the ability to take a feature/product from POC to MVP to market on time.

  • A positive attitude and a desire to build accessible products for all users.

  • Ability to project manage concurrent initiatives and use effective judgment in prioritization and time management.  

  • Creative, self-motivated, highly energetic, detail and results-oriented. 

  • Excellent analytical/problem-solving ability.

  • Ability to understand the product, its logs, and troubleshoot errors.

  • Strong technical documentation and communication. 

Required Tech Stack Experience 


Must have a strong background building products and features with the following tech stack:


  •   Javascript

  •   React

  •   Typescript

  • Python

  •   GraphQL

  •   HTML/CSS/Flexbox

  •   Git

Preferred experience


  • Tanstack Query

  • WebSockets

  • Webpack/Vite

  • Monorepo

  • AWS

  • GitLab CI

  • Figma

  • Design Systems

  • Defensive/Offensive Cyber Security Experience

Travel Required 


We are a fully remote company, and this job may require up to 5% of travel to be successful. 

Perks of Horizon3.ai



  • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive.

  • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities.

  • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking.

  • Remote Work: We are a 100% remote company. Enjoy the flexibility to work in the way that supports you and brings out your best. 

  • Competitive Compensation: We offer competitive salary and benefits which includes health, vision & dental care for you and your family, a flexible vacation policy, and generous parental leave. 

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 that every team member is recognized and compensated equitably across roles, levels, and locations.In accordance with various State’s transparency regulations, we provide the following salary range information for this position:


  • Base salary range: $150,000 - $180,000 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 an equity package (in the form of stock options). If any other compensation benefits apply, they will be discussed during the interview process.

You Belong Here


Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, hair length or any other legally protected status by law.Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve.

We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth.We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless.

Other Duties


Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice. 

Application Note


In any materials you submit, you may redact or remove age-identifying information such as age, date of birth, or dates of school attendance or graduation. You will not be penalized for redacting or removing this information.

This job is no longer open

Life at Horizon3 AI

Our story… We are the fusion of former US Special Operations cyber operators, startup engineers, and frustrated cybersecurity practitioners. We see the world for what it is - bloated security tools, alert fatigue, reports filled with false positives, "checkbox" security culture, and consultants trying to pitch their "expertise". Our approach: We use the "Attacker's Perspective" to cut through the noise and help you find & fix security problems that matter. We deliver that attacker's perspective by running continuous, automated pen-test & red team operations, building “cyber terrain maps”, and running analytics to identify angles of attack. We deliver these capabilities as a true SaaS – no consultants, no professional services, and no “cheating” with agents or up-front configurations
Thrive Here & What We Value- Employee Development and Career Advancement- Collaborative Work Environment- Innovation and Creativity- Community Impact- Supportive Culture- Positive Company Ethos- Growth Opportunities- Teamwork Emphasis- Social Responsibility
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