Senior Full Stack Engineer, Horizon3
$155-208k
+ Equity in the form of stock options
More information about location
Autonomous security solutions
Open for applications
Autonomous security solutions
101-200 employees
Open for applications
$155-208k
+ Equity in the form of stock options
More information about location
101-200 employees
Company mission
To help find and fix attack vectors before attackers can exploit them.
Role
Who you are
- BS in Computer Science, Engineering, or equivalent technical background
- 7+ years of experience building production applications, primarily focused on backend development
- Strong prioritization skills to balance competing demands on team resources
- Proven experience delivering backend APIs (especially GraphQL) and working with modern web stacks
- Comfortable contributing to and occasionally leading frontend development efforts in React/TypeScript
- Experience troubleshooting production infrastructure (preferably in AWS)
- Experience collaborating with designers, developers, architects, and product managers
- Experience working with AI-assisted development tools and interest in leveraging AI for productivity
- Strong problem-solving skills, ownership mentality, and the ability to operate in a fast-paced environment with shifting priorities
- Startup or high-growth environment experience: building features from idea to production with urgency and pragmatism
- Must have a strong background building products and features with the following tech stack:
- Python (strong backend proficiency expected)
- Javascript, React, Typescript
- SQL
- GraphQL
- HTML/CSS/Flexbox
- Git
Desirable
- React Query
- WebSockets
- PostgreSQL
- Vite
- AWS
- GitLab CI/CD
- Familiarity with LLM integrations or prompt engineering
- Experience in Cyber Security (Defensive/Offensive)
What the job involves
- You’ll join a fast-paced, collaborative team of talented software engineers helping shape the future of autonomous security testing. While this is a full stack role, we’re specifically looking for engineers with strong backend experience who are comfortable building out front-end features when needed—not because it’s “beneath them,” but because they understand the value of end-to-end product delivery
- Work across the stack to deliver scalable, secure, and high-performing features for our enterprise SaaS platform, with a primary focus on backend development using Python and GraphQL
- Build and support front-end features in React/TypeScript as needed to complete user-facing workflows
- Collaborate with Engineering, Product, and Design teams to break down features, own technical requirements, and help shape the roadmap
- Contribute to architecture decisions, own key services, and guide system design as the platform evolves
- Write high-quality code, enforce best practices through code reviews, and maintain strong test coverage
- Ensure CI/CD reliability, infrastructure stability, and app performance in AWS
- Lead by example, mentoring junior engineers and promoting a culture of technical excellence and continuous learning
- Balance hands-on development with technical leadership responsibilities
Our take
In an era marked by escalating cyber threats and data breaches, safeguarding digital assets has become a high priority across all industries. Amid this landscape, Horizon3.ai stands out as an autonomous security solution by addressing the critical need for robust cybersecurity.
At the heart of Horizon3.ai's mission is NodeZero™, a platform designed to elevate proactive security measures. Using this, customers can verify their security posture and identify potential vulnerabilities through self-service. This proactive approach to cybersecurity effectively thwarts potential exploits and ensures the integrity of their digital infrastructure.
With recent funding under its belt, the company is poised to further its ambition to develop into an industry-leading cybersecurity company. The infusion of funds will be channelled towards expanding its partner network and refining its offerings. Horizon3 aims to establish itself as a pivotal player in the evolving cybersecurity landscape, growing its presence across industries and geographies.
Kirsty
Company Specialist at Welcome to the Jungle
Insights
-8% employee growth in 12 months
Company
Funding (last 2 of 6 rounds)
Jun 2025
$100m
SERIES D
Aug 2023
$40m
SERIES C
Total funding: $187m
Company benefits
- 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
Company HQ
SoMa, San Francisco, CA
Leadership
Snehal Antani
(Co-Founder & CEO)Graduated from the Rensselaer Polytechnic Institute with an MS in Computer Science. Previously worked at IBM as a Lead Architect, at GE Capital as the CIO of Distribution Finance and Splunk as the SVP & GM of Business Analytics & IoT.
Anthony Pillitiere
(Co-Founder)Graduated from the University of Maryland with a Bachelor's Degree in Computer Systems Networking and Telecommunications. Previously worked at the United States Air Force in multiple roles, including Deputy Chief Technology Officer.
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