About
CloudLinux is a global remote-first company. We are driven by our principles: do the right thing, employees first, we are remote first, and we deliver high-volume, low-cost Linux infrastructure and security products that help companies to increase the efficiency of their operations. Every person on our team supports each other and does what we can to ensure we all are successful. We are looking for a Lead Security Engineer - Vulnerability Response to join our Web Protection Team.
Responsibilities
•Design and build the AI-driven pipeline from disclosure to announcement: vulnerability intake, triage, rule drafting, testing, release, and the public advisory
•Lead the extension of our existing WordPress-plugin pipeline to ModSecurity/Coraza rules
•Write and review WAF rules (ModSecurity/SecLang) for real-world web vulnerabilities
•Build test harnesses that check rules against exploits and real traffic before release
•Lead and mentor security analysts: set priorities, review their work, remove blockers
•Define and track time-to-protection, coverage, and false-positive rate, and improve them
•Automate advisory generation as part of the pipeline, and agree the format and review flow with marketing
Requirements
•5+ years in web/application security: vulnerability research, detection engineering, WAF engineering, or similar
•Deep understanding of web attack classes (SQLi, XSS, RCE, auth bypass, path traversal, file upload, deserialization) and how to detect them in HTTP traffic
•Hands-on experience writing WAF rules (ModSecurity/SecLang, OWASP CRS, or similar) and regular expressions
•Able to read PHP code and understand a vulnerability from an advisory or a patch diff
•Strong Python: you've built automation pipelines that run in production. CI/CD and automated testing
•Hands-on daily use of AI/LLM tools; you know where to trust them and how to verify their output
•Proven track record of leading a technical project end to end
•Product mindset: you reason about customer impact, not only technical correctness
•Upper-intermediate English or better
•Strong ownership: you take a goal, not a task list
•See the whole process and find the bottleneck, not only fix individual issues
•Communicate clearly and raise risks early
•Calm under pressure: critical vulnerabilities don't wait for working hours
•Comfortable making decisions with incomplete information
Nice to have
•WordPress ecosystem security: plugin vulnerabilities, vulnerability feeds (Wordfence, Patchstack, WPScan), CVE credits or bug bounty
•Coraza or other WAF engines
•Exploit analysis or threat intelligence background
•Linux server administration, hosting industry
Conditions
•A focus on professional development
•Interesting and challenging projects
•Fully remote work with flexible working hours, that allows you to schedule your day and work from any location worldwide
•Paid 24 days of vacation per year, 10 days of national holidays, and unlimited sick leaves
•Compensation for private medical insurance
•Co-working and gym/sports reimbursement
•Budget for education
•The opportunity to receive a reward for the most innovative idea that the company can patent
