Incident Response Analyst - REACT

Job Application for Incident Response Analyst at Cloudflare

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About Us

At Cloudflare, we are on a mission to help build a better Internet. Today the company runs one of the world’s largest networks that powers millions of websites and other Internet properties for customers ranging from individual bloggers to SMBs to Fortune 500 companies. Cloudflare protects and accelerates any Internet application online without adding hardware, installing software, or changing a line of code. Internet properties powered by Cloudflare all have web traffic routed through its intelligent global network, which gets smarter with every request. As a result, they see significant improvement in performance and a decrease in spam and other attacks. Cloudflare was named to Entrepreneur Magazine’s Top Company Cultures list and ranked among the World’s Most Innovative Companies by Fast Company.

At Cloudflare, we’re not looking for people who wait for a polished roadmap; we’re looking for the builders who see the cracks in the Internet that everyone else has simply learned to live with. We value candidates who have the instinct to spot a "normalized" problem and the AI-native curiosity to create a solution using the latest tools. Our culture is built on iteration, leveraging AI to ship faster today to make it better tomorrow, while ensuring that every improvement, no matter how small, is shared across the team to lift everyone up. If you’re the type of person who values curiosity over bureaucracy, and that AI is a partner in solving tough problems to keep the Internet moving forward, you’ll fit right in.

Available Locations: Lisbon, Portugal

About the Role

Cloudflare is a system spanning the globe, on a mission to make the internet safer and more powerful everyday. To help fulfill this mission, we are seeking a talented REACT Analyst / Consultant to join us in growing our Cloudforce One REACT organization. In this role, you will be instrumental in building a proactive and threat intelligence-driven approach to protecting Cloudflare and its customers from sophisticated and evolving threat actors.

As a REACT Consultant, you will respond to customer security incidents across on-premises, cloud, and hybrid environments. This position requires an innovative, self-starting, and detail-oriented problem solver with a passion for analyzing, tracking, and triaging malicious activity. You will engage with customers at all levels—including Executive, VP, Director, and engineering levels—serving an integral role alongside forensic analysts, threat researchers, detection engineers, and malware analysts to detect, isolate, and mitigate threats.

Key Responsibilities

1. Incident Response & Active Edge Mitigation

Active Edge Mitigation: Execute immediate defensive maneuvers at the Cloudflare edge to protect customer availability. This includes deploying custom WAF rules, implementing L3/L4 DDoS shunning, and performing real-time traffic filtering to neutralize attacks before they reach the customer's origin.

Support Full IR Lifecycle Management: Support and execute the end-to-end incident response process for clients (investigation, containment, remediation, and recovery). Review technical deliverables and coordinate sessions with customer stakeholders to ensure high-quality service and resolution.

Incident Remediation: Build a strong understanding of targeted attacks to create and execute customized tactical and strategic remediation plans for compromised organizations.

2. Direct Customer Containment & Threat Isolation

Ransomware & BEC: Identify and isolate infected hosts, revoke compromised sessions/identities, and stop data exfiltration within the customer's infrastructure.

Insider Threats & Nation-State Attacks: Track unauthorized lateral movement, identify sophisticated persistent backdoors, correlate threat actor activity across the environment, and execute containment to preserve evidence while neutralizing the adversary.

3. Forensics, Engineering & AI Analysis

Forensic Evidence & Chain of Custody: Conduct initial evidence preservation (logs, volatile memory, disk images) within customer environments according to forensic standards to support legal, regulatory, or insurance requirements.

Crisis Solution Development: Create and enhance client-facing Crisis & Incident Response solutions based on industry standards (ISO 27001, NIST, CIS). Advance customer cyber readiness by identifying opportunities for process optimization in monitoring, detection, and response.

AI-Leveraged Analysis: Utilize AI-powered security platforms to synthesize massive telemetry sets, automate log summarization, and accelerate the identification of emerging threat patterns during active customer engagements.

Technical Documentation & Reporting: Prepare high-fidelity incident reports, forensic findings, and client communications. Maintain rigorous standards for clarity and accuracy to ensure customer executives and engineers understand both the threat and the resolution.

Desirable Skills, Knowledge, and Experience

Education: Bachelor's degree in Computer Science, Information Systems, Cybersecurity, a related technical field, or equivalent training/practical experience.

Experience: 3+ years of overall experience in cybersecurity, including 2+ years of dedicated Incident Response / Digital Forensics experience, and 1+ years in a customer-facing role.

OS & Cloud Environments: In-depth understanding of Windows operating systems and general knowledge of Unix, Linux, and Mac environments. Familiarity with cloud environments (AWS, Azure, O365, Google Cloud, Cloudflare) and cloud IR methodologies.

Network Forensic Analysis: Strong technical knowledge of common network protocols and design patterns (TCP/IP, HTTPS, FTP, SFTP, SSH, RDP, CIFS/SMB, NFS). Experience with network analysis tools like Bro/Zeek or Suricata, and analyzing associated network logs.

Industry Standards: Solid understanding of MITRE ATT&CK and NIST Cyber Security Frameworks.

Communications: Excellent verbal and written communication skills with a proven ability to establish relationships and clearly explain tasks, guidance, and complex technical findings to executive and technical clients.

Bonus Points

Proficient in Python or Golang, capable of writing modular code or simple scripts that can be installed on a remote system.

Proficient with Yara and writing rules to detect similar malware samples....