We are looking for a Lead Security Engineer - Vulnerability Response to join our Web Protection Team. 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.

Check out our website for more information: cloudlinux.com

Imunify360 Security Suite is an innovative security solution designed specifically for shared and VPS/Dedicated servers. The automated, easy-to-use solution with the six-layer approach to security delivers comprehensive and complete attack prevention.

The challenge ahead When a critical vulnerability in a popular web application or WordPress plugin goes public, attackers start exploiting it within hours. Most site owners can't patch that fast. We want our customers protected before the first attack reaches them, and we want them to know it.

That's the challenge we're hiring for:

AI-driven vulnerability response. Build and run a pipeline that detects new high and critical vulnerabilities, generates WAF rules with AI assistance, validates them, and ships them to production in a short window

Protection plus public announcement, both automated. The same pipeline that ships the rule also produces the public advisory. Every critical vulnerability we cover is announced soon after the rule ships, so customers and the market see that Imunify closed it first

Build on what works. An AI-assisted pipeline already runs for our WordPress protection plugin. The first big project is to extend this approach to ModSecurity/Coraza WAF rules

Speed without breaking sites. On shared hosting, a rule that blocks legitimate traffic is a customer incident. Fast and precise both matter

Make it measurable. Time-to-protection,



coverage of critical vulnerabilities, and false-positive rate are the numbers this role owns

About The Role You will own the vulnerability response pipeline end to end and be its main builder. You combine deep web application security expertise with strong automation skills, and you think about the product: what customers need, what to measure, what to build next. You'll lead a small team of security analysts and work closely with automation, QA, and marketing.

What You'll Do

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 What we're looking for:

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

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

Personal skills:

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

Benefits What's in it for you?

A focus on professional development

Interesting and challenging projects

Fully remote work with versátil 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

By applying for this position, you consent to the processing of your personal data as described in our Privacy Policy (https://cloudlinux.com/candidate-privacy-notice), which provides detailed information on how we maintain and handle your data.

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📌 Lead Security Engineer - Vulnerability Response (Imunify360) (Barcelona)
🏢 CloudLinux
📍 Barcelona