---
title: 'Senior Technical Support Engineer, EMEA at Horizon3 AI'
canonical: 'https://feeny.ai/job/senior-technical-support-engineer-emea-horizon3-ai-amsterdam-1xbkdvyzfgwt'
type: 'job'
last_seen: '2026-09-12'
---

# Senior Technical Support Engineer, EMEA at Horizon3 AI

- **Company:** [Horizon3 AI](https://feeny.ai/companies/horizon3-ai)
- **Location:** Amsterdam, Netherlands
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-08-28
- **Last confirmed live:** 2026-09-12
- **Apply:** https://jobs.ashbyhq.com/horizon3ai/0371c81c-9330-4202-af9f-38226cdb8c8c

## Job description

Get to Know Us [Horizon3.ai](http://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.

## What You’ll Do

We are seeking a motivated Mid to Senior Level Enterprise Technical Support Engineer with 5+ years of hands-on industry experience to join our high-performing support team. In this role, you will serve as a key technical resource for our enterprise customers, diagnosing and resolving complex issues related to cloud infrastructure, networking, and security. You'll collaborate with cross-functional teams to ensure seamless customer experiences, leveraging your expertise in Linux, containerization, and cloud technologies. This position requires a proactive self-learner who thrives in fast-paced enterprise environments and can handle escalated support tickets with minimal supervision.

## Key Responsibilities

- Provide advanced technical support to enterprise customers via phone, email, chat, and remote sessions, troubleshooting issues across cloud, networking, and infrastructure domains.
- Diagnose and resolve customer-reported problems, performing root cause analysis to prevent recurrence and ensure high availability of services.
- Collaborate with engineering, product, and sales teams to escalate and resolve intricate technical challenges, while documenting solutions for knowledge sharing.
- Assist in the deployment and optimization of customer environments, offering guidance on best practices for infrastructure as code (IaC) and containerized applications.
- Monitor and respond to support tickets in a timely manner, maintaining SLAs and contributing to continuous improvement of support processes.
- Mentor junior team members and contribute to internal training resources, fostering a culture of knowledge transfer and technical excellence.
- Stay abreast of emerging technologies and industry trends to enhance support capabilities and customer satisfaction.

Required Qualifications

- Bachelor's degree in Computer Science, Information Technology, Engineering, or a related field (or equivalent professional experience).
- 5+ years of relevant industry experience in technical support, systems administration, or cloud operations, ideally in an enterprise-level environment (e.g., supporting large-scale deployments for Fortune 500 clients).
- Background in cybersecurity, including knowledge of threat detection, vulnerability management, encryption standards, and compliance frameworks (e.g., SOC 2, GDPR).
- Strong proficiency in Linux administration, including server configuration, performance tuning, security hardening, and troubleshooting in production environments.
- Hands-on experience with Docker and containerization technologies, such as building, deploying, and managing containerized applications in orchestrated environments (e.g., Kubernetes or similar).
- Solid understanding of cloud platforms (e.g., AWS, Azure, or GCP) and Infrastructure as Code (IaC) tools like Terraform, Ansible, or CloudFormation, with experience provisioning and managing cloud resources.
- In-depth knowledge of networking fundamentals, including TCP/IP, firewalls, VPNs, load balancers, and network troubleshooting tools (e.g., Wireshark, tcpdump).
- Basic scripting skills in languages such as Bash, Python, or PowerShell for automation of routine tasks, diagnostics, and simple workflow enhancements.
- Demonstrated self-learning ability, evidenced by personal projects, home labs, certifications (e.g., AWS Certified Solutions Architect, Linux+, or equivalent), or contributions to open-source communities, with a track record of adapting to new technologies independently.
- Experience equivalent to a junior cloud administrator role in an enterprise setting, managing multi-tenant environments, resource allocation, and compliance requirements.
- Familiarity with identity management systems, including Role-Based Access Control (RBAC), Single Sign-On (SSO) protocols (e.g., OAuth, SAML), and directory services (e.g., Active Directory, LDAP).
- Basic understanding of database concepts, including relational and schemaless databases (e.g., SQL vs. NoSQL), schema design, querying, and basic administration tasks.

## Preferred Qualifications

- Proven experience integrating and troubleshooting APIs, including RESTful services, authentication mechanisms, and API-driven automations in enterprise applications.
- Familiarity with observability tools like Datadog, including monitoring, logging, and alerting for distributed systems to enhance system reliability and performance.
- Basic experience with managed database services such as Amazon RDS, including setup, backups, scaling, and query optimization.
- Full-stack coding proficiency in languages like Python, JavaScript, or Go, with experience developing custom tools or scripts for support automation.

Travel Required We are ideally looking for someone to be based hybrid in our Amsterdam office or can be remote in UK, France, Ireland or Spain.

## 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.

- Additional compensation: All full-time roles are eligible for an equity package in the form of stock options.

Perks of [Horizon3.ai](http://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.
- Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave.

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.

## 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)

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