Sr. Vulnerability Researcher (US)

Sr. Vulnerability Researcher (US) About VulnCheck Exploitation prevention is only as strong as the intelligence driving those efforts, and most of the industry is still running on intelligence that lacks exploit context. VulnCheck, The Exploit Intelligence Company, delivers structured exploit intelligence on what is actively weaponized in the wild, purpose-built for the data lakes, ETL pipelines, automation, and AI and LLM workflows your infrastructure already runs on, raising the capability of everything it powers. About the Role We’re looking for a Senior Vulnerability Researcher to join our agentic vulnerability discovery team. This role sits within our Initial Access Intelligence group, which delivers exploits, detections, and other artifacts designed for active cyber defense. You'll work with a seasoned team of hackers and threat researchers to find and weaponize new vulnerabilities across a range of operating systems, platforms, and devices — before adversaries do. You'll drive original research from exposure analysis and reverse engineering through vulnerability discovery and weaponized exploit development. You'll also help push the state of the art in how VulnCheck finds bugs by applying novel agentic approaches to vulnerability discovery and exploit creation. This is a 100% remote role based in the United States. Why Join VulnCheck? VulnCheck stands behind its mission to influence how organizations worldwide understand, assess, and remediate security vulnerabilities — and to deliver intelligence-based solutions that change the world. You'll be joining a collaborative, supportive environment that values intellectual curiosity, technical mastery, and personal growth. (And more, below!) • Leverage your expertise: Work on cutting-edge threat intelligence initiatives that matter, alongside the top domain experts in the field. • Shape the industry: Influence how vulnerabilities are classified, scored, mapped, and remediated at scale for enterprise customers and for the entire cybersecurity industry. • Grow your impact: Collaborate with global partners, lead high-visibility research, and drive standards across the security community. • Innovate and explore: Conduct original research and develop tooling — including agentic and automated approaches — for finding and understanding new vulnerabilities. What You'll Do • Conduct vulnerability research to identify net-new vulnerabilities across a range of operating systems, platforms, and devices • Reverse engineer a variety of firmware and software • Author original exploits, network rules (Suricata / Snort), and other artifacts (e.g., Docker containers, version scanners, ASM queries) to accompany new vulnerability finds • Apply and expand agentic approaches to scale vulnerability discovery and exploit development What You'll Bring • 5+ years of full-time vulnerability research experience, including experience targeting networking device firmware, embedded Linux/RTOS-based systems, and/or network protocols • Demonstrable experience with agentic approaches to vulnerability discovery and exploit development • Experience developing original (weaponized) exploit code • Comfort acquiring, unpacking, and analyzing target firmware and appliances, including reasoning about network protocols and unauthenticated attack surface • Familiarity with embedded architectures (MIPS, ARM) and firmware extraction/unpacking (e.g., binwalk). • Experience with dynamic analysis and debugging on embedded/emulated targets (e.g., QEMU) • Working knowledge of common networking protocols (TCP/IP, routing protocols, VPN protocols such as IPsec/SSL-VPN, SNMP, etc.). • Strong reverse engineering skills, including static and dynamic analysis of compiled binaries and firmware (VulnCheck uses Ghidra for reversing) • Strong command of memory corruption and other vulnerability classes (e.g., stack and heap overflows, use-after-free, type confusion, integer errors, command and path injection, authentication and logic flaws) • Solid working knowledge of C/C++ and at least one scripting language (e.g., Python) • Experience working on technical projects remotely, alone, and on small teams. Preferred Qualifications • Prior cybersecurity work experience (at a vendor or in government) • A track record of discovering new vulnerabilities (e.g., CVEs, advisories, exploits, or published research) • Able to share example research or exploit code written IMPORTANT NOTE: This position may involve access to technology subject to U.S. export control regulations. Employment is contingent upon the company's ability to authorize access under applicable export control, sanctions, and any other applicable legal or contractual requirements. The company does not guarantee and is under no obligation to seek such authorization if it would be necessary. What We Offer We believe people do their best work when they feel supported, trusted, and valued. VulnCheck offers benefits designed to meet a wide range of needs and lifestyles, tailored to your country of employment: • Generous, flexible time off • Retirement/pension plan contributions (e.g., 401k with match in the US; local pension schemes elsewhere) • Comprehensive healthcare coverage • Generous paid parental leave • Remote-friendly environment with flexibility • Support for home office costs (phone & internet) Specific benefit details vary by country and are confirmed during the offer process. Why Join Us Built on over two decades of cybersecurity experience, our team of experts understands the intricacies of vulnerabilities, their exploitation in the wild, and how to leverage this data to build more effective cybersecurity products that produce better outcomes for organizations. VulnCheck gives organizations a tactical advantage by providing best-in-class exploit & vulnerability intelligence information. We have a sense of duty to protect the critical infrastructure we rely on including medical devices, power grids and telecommunication networks. We were founded in 2021 in Lexington, Massachusetts. VulnCheck has a transparent, collaborative, and supportive culture — we are looking for people who have a growth mindset, are curious and innovative. Our team is smart, but humble, hardworking, and supportive. VulnCheck is proud to be an Equal Employer Opportunity employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics. VulnCheck is committed to working with and providing reasonable accommodations to applicants with physical and mental disabilities. Even if your experience doesn't perfectly align with the job description, we encourage you to apply—we value potential just as much as a perfect resume.