Network Security Engineer

At Cloudflare, we're on a mission to help build a better Internet. We run 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.

The Cloudflare Customer Support Team solves complicated problems and answers technical questions via phone, email, chat and social media. We're seeking an experienced Network Security Engineer to join our team and support our largest and most technically sophisticated customers in resolving technical problems, threats or attacks on their infrastructure at OSI Layers 3, 4, and 7.

Responsibilities

• Serve as a trusted technical advisor for our enterprise customers, responding to and resolving inquiries and incidents related to network security and performance.
• Work directly with customers to diagnose, troubleshoot and resolve complex technical issues involving DDoS mitigation, firewall rules, SSL/TLS, network confirmation, and other security configurations.
• Create and maintain knowledge base articles, technical guides, and troubleshooting documentation for internal and customer use.
• Compare traffic signatures and attributes to determine what is good traffic and what is malicious.
• Advise customers on how to filter malicious traffic using Cloudflare tools like Magic Transit, Network Firewall, WAF, IP reputation lists, packet inspection, blocklisting, allowlisting, and rate limiting.
• Work with Engineering and Product teams to improve products and tools.
• Utilize generative AI and automation tools to streamline log analysis, accelerate root-cause analysis during security incidents, and optimize customer response times.

Requirements

• Minimum of 4 years experience working as a Network Security Engineer / Technical Support Engineer / Sr. Support Engineer supporting networking or web security products.
• Exceptional troubleshooting and problem-solving skills, with the ability to simplify complex concepts for customers.
• Strong customer service orientation and communication skills.
• Ability to work independently and collaboratively in a fast-paced, dynamic environment.
• Strong understanding of network protocols, including TCP/IP, DNS, HTTP/S, and BGP.
• Proven experience troubleshooting network connectivity issues, BGP routing, and GRE tunnels, and performing packet capture analysis.
• Confident with command line and tools, including curl, dig, traceroute, openssl, git.
• Experience in a web development and / or hosting environment.
• Competent at writing scripts in Bash, Python, JavaScript or other scripting languages.
• Experience working with PostgreSQL, MySQL, MS SQL, and other database servers.
• Bachelor's degree in Computer Science, Cybersecurity, or a related field (or equivalent experience).
• Relevant certifications such as CISSP, GCIA GCIH, GCFA, GCFE or equivalent.