Security Engineer – Node.js, Proactive Defense

CloudLinux

Security Engineer for CloudLinux developing runtime protection for Node.js applications in a fully remote setup. Focus on security for managed-hosting environments and cooperation with AI coding agents.

Posted 7/21/2026full-timeRemote • 🇵🇱 PolandMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in building runtime protection layers and web application security, with a strong focus on detection logic and threat intelligence. Capable of leading product development from conception to implementation while effectively utilizing AI coding agents.

Highest-signal resume keywords

Node.js Runtime FamiliarityWeb Application Security FundamentalsDetection Rules Behavior at ScaleRuntime-Protection Product ExperienceMalware Analysis Background

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

JavaScript EcosystemDetection Logic ImplementationThreat Intelligence UtilizationInstrumentation StrategyApplication Firewall Knowledge

Soft Skills

LeadershipResource ManagementProactive Problem Solving

Tools & Technologies

Managed-Hosting EnvironmentsAI Coding Agents

Industry Keywords

Public Security ResearchVulnerability DisclosuresDetection Rulesets

Tech Stack

Tools & technologies

FirewallsJavaScriptNode.js

About the role

Key responsibilities & impact

Build that runtime protection layer end-to-end.
Define the product — what we intercept, what we don't, what the customer-visible surface looks like.
Determine the technical approach — instrumentation strategy, deployment shape, programming language — all open.
Implement the product, end to end, using the full tooling stack provided.
Establish your methodology for building conviction in your detection logic.
Utilize cross-layer signal from existing stack to help with threat intelligence and detection.

Requirements

What you’ll need

Familiarity with the Node.js runtime and the JavaScript ecosystem.
Strong web application security fundamentals and current knowledge of practical exploitation.
A working sense of how detection rules behave at scale — what catches attackers without flagging the long tail of legitimate code.
Ability to start as the PM, architect, lead engineer, and QA for this product. You ask for resources or help when you need them; you don't wait to be told what to do.
Comfort directing AI coding agents to high-quality output — most of our engineering does this now.
Prior work on runtime-protection products, application firewalls, or instrumentation tooling.
Background in malware analysis or incident response.
Familiarity with managed-hosting environments.
Public security research, vulnerability disclosures, or detection rulesets you've authored.

Benefits

Comp & perks

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.