---
title: 'Senior Engineering Manager, Rapid Response at Horizon3 AI'
canonical: 'https://feeny.ai/job/senior-engineering-manager-rapid-response-horizon3-ai-united-states-zrcycdthh9q4'
type: 'job'
last_seen: '2026-09-12'
---

# Senior Engineering Manager, Rapid Response at Horizon3 AI

- **Company:** [Horizon3 AI](https://feeny.ai/companies/horizon3-ai)
- **Location:** United States
- **Compensation:** $242k–$328k
- **Employment:** full-time
- **Work type:** remote
- **Posted:** 2026-08-27
- **Last confirmed live:** 2026-09-12
- **Apply:** https://jobs.ashbyhq.com/horizon3ai/35b5f49f-67a4-47ee-b2a3-9f9d9d5b6c10

## Job description

Summary We are seeking an experienced Senior Engineering Manager to lead our Rapid Response Attack Engineering team. Rapid Response is Horizon3’s proactive capability that allows customers to keep ahead of emerging, exploitable vulnerabilities before adversaries can exploit them in the wild. You will lead a high-performing team of Attack Engineers operating at the intersection of breaking vulnerability research, AI-driven automation, and product delivery. In this role, you will establish operational excellence across daily triage and execution while balancing rapid delivery with production-safe quality. You will bring a deep understanding of vulnerability analysis, lead a team building out cutting-edge AI harnesses to accelerate vulnerability research and exploit pipelines, and partner closely with Product Management to turn offensive research into a high-quality product. Ideal candidates bring a strong mix of technical depth in vulnerability analysis, leadership experience, and a software engineering mindset. You should be excited to mentor a diverse team and build foundational AI-native technologies that shape the future of autonomous offensive security.

## What You’ll Do

Leadership & Team Development

- Lead a diverse team of Attack Engineers specializing in vulnerability research and agentic software engineering across multiple seniority levels (from junior engineers to Principal Attack Engineers), ensuring appropriate career development, mentorship, and growth paths for each.
- Set technical direction, priorities, and quality standards for AI-native automation pipelines, vulnerability research and the Rapid Response product
- Drive hiring and organizational scaling as the Rapid Response team expands.
- Foster a culture of continuous learning, raising the bar for offensive rigor, delivery quality, and secure software development practices.

Rapid Response Strategy & Execution (Hack, Fix, Verify, Repeat)

- Lead daily triage, prioritization, and cross-functional coordination for breaking CVEs and zero-days. Establish high-velocity operational cadences that allow the team to analyze, reproduce, and weaponize emerging threats within hours of public disclosure.
- Drive the vision and engineering for AI-driven harnesses, LLM workflows, and automated pipelines to accelerate vulnerability discovery, patch diffing, and proof-of-concept exploit development.
- Partner seamlessly with Product Management and field teams. Serve as the bridge between technical vulnerability research and product strategy, ensuring a high quality Rapid Response product, delivered continuously at market-leading speed.
- Lead the analysis of real-world attack data, telemetry, and threat trends to prioritize high-value research targets and measure the real-world impact of attack coverage.

## What You’ll Bring

Leadership

- 2-3+ years of direct people management experience leading software engineers
- 3+ years of software development experience
- Experience hiring and interviewing engineers
- Experience partnering with Product Management, field teams, and customers to deliver high quality end-user facing products
- Proven ability to balance hands-on technical depth with strategic leadership.
- Strong technical writing and communication skills, capable of conveying complex exploits to both technical and non-technical audiences.

Expertise

- Experience in a prior cybersecurity-related role - R&D, vulnerability research/analysis, or offensive security
- Deep, practical knowledge of vulnerability classes (e.g., remote code execution, authentication bypasses, deserialization, SSRF). Understanding of what makes a vulnerability attractive and practical for real-world threat actors to exploit.
- Strong background in production software engineering, especially in Python
- Experience with leveraging AI harnesses and agentic frameworks
- Familiarity with secure software development practices, Git version control, and effective team workflows.
- Ability to evaluate technical designs and ensure high-quality, production-safe software.
- Experience working with database systems like Postgres or Neo4j.

Desired Skills

- Experience with vulnerability disclosure processes (e.g., published CVEs) or bug bounty programs.
- Experience in exploit development and reverse engineering
- Experience writing customer-facing technical content
- Experience with SQL and analyzing threat intelligence data and attack telemetry
- Experience with deception technologies
- Familiarity with additional programming languages such as C, C++, Rust, or Assembly.
- Knowledge of containerization technologies like Docker and Kubernetes.
- Experience working with cloud environments (AWS, etc.) and large-scale software projects.
- Relevant security certifications (e.g., OSCP or equivalent) are a plus.

Travel Required We are a fully remote company, and this job may require up to 10% travel.

## About Horizon3 AI

## Company Overview
- **One-liner**: Horizon3.ai provides an autonomous penetration testing platform (NodeZero) that safely hacks production environments to identify and fix exploitable attack paths using AI.
- **Entity Type**: Private (Series D – latest funding round in 2026, led by Prosperity7 Ventures)
- **Headquarters**: San Francisco, California, United States (447 Battery Street, San Francisco, CA 94111)
- **Founded**: 2019
- **Founders**: Snehal Antani (Co-Founder & CEO); founded by a mix of US Special Operations, US National Security, and cybersecurity industry veterans

## Core Business
- **Primary industry**: Cybersecurity (autonomous penetration testing, vulnerability management, continuous security validation)
- **Target customers**: B2B – large enterprises, Fortune 100, government agencies (NSA, CISA), healthcare providers, financial services, manufacturing, education, public sector
- **Mission**: “Turn the map around” – using the attacker’s perspective to help enterprises prioritize defensive efforts. The company aims to shift the advantage from attackers to defenders by fighting AI with AI.

## Products & Services
- **[NodeZero®](https://horizon3.ai/)**: Autonomous penetration testing SaaS platform. Safely runs real attack techniques in production environments (no agents, no disruption). Discovers and chains exploitable vulnerabilities, misconfigurations, harvested credentials, and dangerous defaults across external, identity, on-prem, cloud, and Kubernetes attack surfaces. Also includes Active Directory password auditing and phishing impact testing. Continuously validates fixes and repeats autonomously.

## Market Standing
- **Valuation**: Not publicly disclosed
- **Key Metrics**: 
  - Annual Revenue: **$35.5M** (per LinkedIn)
  - Total Funding: **$187M** (per LinkedIn) / **$181M** (per CB Insights – conflicting reports; both cited)
  - **225,000+** production-safe tests completed
  - **5,000+** customers
- **Notable Investors/Partners**: 
  - SignalFire (lead in Seed, Series A, Series B)
  - Craft Ventures (lead Series C)
  - Prosperity7 Ventures (lead Series D – 2026)
- **Growth Signals**:
  - Ranked **#1 in Security** on the 2025 Inc. 5000 list
  - **#3 overall** on the 2025 Deloitte Technology Fast 500
  - Fast Company’s **Most Innovative Companies** (2026) – #1 in Security
  - Named to the **Fortune Cyber 60** (2023 & 2025)
  - Two-time **Black Unicorn Award** winner
  - Headcount grew **115.5% YoY** to 341 employees (LinkedIn)
  - Active job postings up **168.2% YoY**; operates in 14 countries

## Competitive Advantages
- **AI-driven autonomous testing** that learns from hundreds of thousands of tests and uses the right AI (ML, GenAI) for each problem – delivers evidence-based results with **zero hallucinations**.
- **Production-safe** – zero downtime across all production tests, trusted by the world’s most sensitive high-security environments (NSA, CISA, Fortune 10, major healthcare).
- **No agents required** – fully self-service SaaS, safe to run continuously.
- **Real attack techniques** – not a scanner; shows actual attacker paths and impact.
- **Rapid verification** – instantly confirms fixes and repeats the cycle, enabling a continuous validation loop.

## Strategic Focus
- **Continuous validation** – driving a loop of test-fix-verify-repeat autonomously.
- **Fighting AI with AI** – building NodeZero to operate at machine speed against AI-powered attacks.
- **Global expansion** – already in 14 countries, with active hiring in EMEA, APAC, and the Americas.
- **Scaling the team** – 59 active job postings (as of mid-2026), with emphasis on engineering, sales, and customer success roles.

## Why Work Here
- **Culture**: Rated **5.0/5.0 on LinkedIn** (76 reviews) with perfect scores for Culture (5.0), Career (4.9), Compensation (4.7), and Work-Life (4.6). Described as a “kick-ass organization hell bent on disrupting an industry” with a team of “motivated learn-it-alls.”
- **Work Policy**: Remote-friendly (most roles listed as remote, HQ in San Francisco, CA). Offers flexibility across time zones.
- **Notable Perks** (from Built In and LinkedIn):
  - Comprehensive healthcare (medical, dental, vision, FSA)
  - Life insurance, disability insurance
  - 401(k) with company matching
  - Equity and employee stock purchase plan
  - Generous parental leave and family medical leave
  - Performance bonuses
  - Job training, conferences, and customized development tracks
  - Promotion policies and career growth support
- **Engineering Culture**: Built by US Special Operations and National Security veterans. Emphasis on high autonomy, real-world impact, and cutting-edge AI/security work. “If you want to be part of a kick-ass organization hell bent on disrupting an industry and keeping attackers at bay, let’s talk.”

## Sources
1. [horizon3.ai – Homepage](https://horizon3.ai/)
2. [horizon3.ai – About/Team](https://horizon3.ai/about-us/)
3. [LinkedIn – Horizon3.ai Company Page](https://www.linkedin.com/company/horizon3ai)
4. [Built In – Horizon3.ai Careers & Perks](https://builtin.com/company/horizon3ai)
5. [CB Insights – Horizon3.ai Profile](https://www.cbinsights.com/company/horizon-3-ai)

## Other roles at Horizon3 AI

- [Account Executive, MSP (East)](https://feeny.ai/job/account-executive-msp-east-horizon3-ai-east-q4w5atyf2a5p) — East
- [Senior Channel Field Marketing Manager, META](https://feeny.ai/job/senior-channel-field-marketing-manager-meta-horizon3-ai-dubai-0d5m3qsarw9t) — Dubai, United Arab Emirates
- [Channel Account Manager, Midatlantic](https://feeny.ai/job/channel-account-manager-midatlantic-horizon3-ai-united-states-fj7veyksksrn) — United States
- [Senior Manager, Sales Compensation & Incentive Strategy](https://feeny.ai/job/senior-manager-sales-compensation-incentive-strategy-horizon3-ai-united-states-nyed00v8m8gz) — United States
- [Manager, Commercial Sales](https://feeny.ai/job/manager-commercial-sales-horizon3-ai-washington-tzanjykxxkvy) — Washington, DC
- [Commercial Account Executive, DC](https://feeny.ai/job/commercial-account-executive-dc-horizon3-ai-washington-p55jz13x238t) — Washington, DC
- [Sales Engineer (Enterprise, Pacific NorthWest)](https://feeny.ai/job/sales-engineer-enterprise-pacific-northwest-horizon3-ai-united-states-qja22wvgb4sq) — United States
- [Partner Operations, MSSP](https://feeny.ai/job/partner-operations-mssp-horizon3-ai-united-states-338jd1v1m3nm) — United States
- [Product & Privacy Counsel](https://feeny.ai/job/product-privacy-counsel-horizon3-ai-united-states-6c6sgefxegx0) — United States
- [Sales Engineer (SouthWest)](https://feeny.ai/job/sales-engineer-southwest-horizon3-ai-southwest-vrtjjnpsxa8b) — Southwest