WebApp Offensive Security Software Engineer

• 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, and 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
• 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 — the edge cases and corner-case attack scenarios that autonomous testing doesn’t yet handle
• Manually reproduce and validate those edge cases, building reliable, production-safe proof-of-concept exploits and clear test cases that demonstrate the gap end to end — including against live customer environments without disrupting them
• Partner closely with software engineers to translate your findings into product improvements — defining detection logic, attack content, expected behavior, and remediation so NodeZero handles those cases going forward
• Build and maintain a library of regression and benchmark test cases so newly added coverage doesn’t silently regress over time
• Monitor production pentests for missed findings and false positives; create and triage Jira tickets to drive issues to resolution
• Work directly with customers and internal teams to investigate findings, explain attack paths, and address questions about web application coverage and results
• 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
• 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

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

• If you love breaking real web apps by hand, get satisfaction from finding what scanners miss, and want your tradecraft to scale to thousands of customers through the product, this role is for you
• Track record of successful bug bounty contributions
• Quick to learn and adopt new technologies as needed
• History of recognized security research, including documented CVE discoveries and responsible disclosure
• Experience applying AI-assisted development tools to security research and automation tasks
• Ability to manage multiple priorities, work independently, and mentor teammates of varying experience levels
• Proficient in object-oriented programming and test-driven development, with strong analytical and problem-solving skills
• Strong written and verbal communication, including technical documentation
• Curiosity about emerging AI technologies
• Experience conducting full scope web application pentests
• Skilled in designing, evaluating, and communicating technical solutions across systems, APIs, algorithms, and data structures
• Familiarity with relational and graph databases, particularly Postgres and Neo4j
• Experience with proxy tools like Burp and with browser developer tools
• Be self-motivated and highly energetic to have the ability to operate effectively with limited supervision and guidance
• Work with our security researchers to understand the technical aspects of reverse engineered exploits and weaponizing these exploits into the product
• Proficient in designing, presenting, and evaluating technical solutions
• Outstanding problem-solving aptitude
• Document findings, methodologies, and recommendations for both technical and non-technical stakeholders
• Strong technical documentation and communication skills
• Experience developing software and automation to aid in web application pentesting
• Experience with AI/LLM tools for building agentic workflows (e.g., LangChain, LangFlow) and integrating contextual data using protocols like Model Context Protocol (MCP)
• Experience fine-tuning language models or implementing retrieval-augmented generation (RAG) for security-focused applications
• Background in large-scale software development projects
• OSCP (Offensive Security Certified Professional) Certification
• Demonstrated examples of using AI to enhance or automate exploit development