Continuous, autonomous pentesting, powered by NodeZero. Are your systems secure? Don't wait for a breach to find out!
Web Application Offensive Security Engineer
Location
United States
Posted
4 days ago
Salary
$196K - $242K / year
Seniority
Mid Level
Job Description
Web Application Offensive Security Engineer
Horizon3.ai
Role Description We're looking for a Webapp Offensive Security Engineer with deep, hands-on web application penetration testing experience to push our autonomous testing beyond what it can do today. You'll be testing real customer web applications — not just labs and benchmarks — using NodeZero as your starting point and then going further as the human expert: - Hunting the edge cases, novel attack chains, and business-logic flaws that automated testing doesn't yet handle. - Proving them out safely against live targets. - Working shoulder-to-shoulder with our software engineers to turn each discovery into durable product coverage that benefits every customer. This is a pentesting-first role. You won't be expected to architect platform internals or ship production features yourself — you'll be the offensive expert who tests live customer applications, finds the gaps NodeZero doesn't yet cover, demonstrates them, defines what "good" looks like, and partners with engineering to close them. Essential Functions - Perform hands-on, full-scope web application penetration tests against real customer applications, alongside benchmark and lab targets, to surface vulnerabilities and attack paths. - Review NodeZero results on live customer engagements to identify coverage gaps, blind spots, and missed opportunities. - Manually reproduce and validate edge cases, building reliable, production-safe proof-of-concept exploits and clear test cases. - Partner closely with software engineers to translate findings into product improvements. - Build and maintain a library of regression and benchmark test cases. - Monitor production pentests for missed findings and false positives; create and triage Jira tickets. - Work directly with customers and internal teams to investigate findings and explain attack paths. - Author technical blog posts and research write-ups showcasing new exploits, edge cases, and attack methodologies. - Mentor teammates and contribute to continuous improvement of team processes, methodology, and testing standards. Qualifications - Extensive hands-on experience conducting full-scope web application penetration tests. - Deep, practical knowledge of common and not-so-common web vulnerability classes. - A talent for finding and exploiting business-logic and edge-case flaws that automated scanners miss. - Strong command of proxy tools like Burp Suite and browser developer tools. - Comfort scripting to reproduce findings and build proof-of-concept exploits. - Ability to clearly communicate attack steps, impact, and remediation guidance. - Curiosity about emerging AI technologies and comfort using AI-assisted tools. - Strong written and verbal communication skills. - Ability to manage multiple priorities, work independently, and mentor teammates. - Quick to learn and adopt new technologies, frameworks, and target stacks. - History of recognized security research, including documented CVE discoveries. - Track record of successful bug bounty contributions. Desired/Nice to Have - Familiarity with how autonomous, agentic, or AI-driven pentesting tools work. - Experience writing detection or attack content. - Enough software development background to collaborate fluently with engineers. - Familiarity with relational and graph databases, particularly Postgres and Neo4j. - Experience with AI/LLM tools for building agentic workflows. Expectations - Outstanding problem-solving aptitude and a relentless curiosity for how things break. - Self-motivated and highly energetic, with the ability to operate effectively with limited supervision. - Work with engineers and security researchers to turn manual discoveries into reliable product capabilities. - Strong technical documentation and communication skills. - Document findings, methodologies, and recommendations for stakeholders. What makes you stand out - A portfolio of novel web application research, exploits, or edge-case findings. - Demonstrated examples of using AI to enhance or accelerate testing. - OSCP, OSWE, or comparable offensive security certifications. Benefits - Inclusive Team: We value diversity and promote an inclusive culture. - Growth Opportunities: Be part of a dynamic and growing team. - Innovative Culture: Work in a collaborative environment that encourages creativity. - Hybrid & Remote Work: Embrace a mix of remote and hybrid work models. - Competitive Compensation: We offer competitive salary, equity, and benefits. 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. In accordance with various State’s transparency regulations, we provide the following salary range information for this position: - Base salary range: $196,000 - $242,000. - Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. 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 welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. 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.
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