Network Security Engineer
Join Cloudflare as a Network Security Engineer to solve complex technical issues and support sophisticated customers in securing their infrastructure.
Posted by employer 1 month ago
First seen on Joblaze 1 month ago
Last verified on the company career page 20 hours ago
Skills & Technologies
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Not disclosed in this posting: years of experience, visa sponsorship.
Benefits
Joblaze summary
In this role, the Network Security Engineer at Cloudflare focuses on resolving complex technical issues for high-profile clients, ensuring their infrastructure remains secure against various threats. Key skills include a deep understanding of OSI layers, modern internet protocols, and experience with tools like DDoS mitigation and web application firewalls. This position is ideal for someone with a strong technical background and customer-facing experience, particularly those who thrive in dynamic environments. Cloudflare's culture emphasizes innovation and collaboration, making it a fitting place for proactive problem solvers.
Joblaze insights
- Listed about a month ago — first seen on Joblaze September 3, 2026. Last confirmed on Cloudflare's careers page October 28, 2026.
- This exact title is also open at 1 other location at Cloudflare: Hybrid.
- Starts above 4% of 156 comparable mid security roles we track (median $125,000 across 55 companies).
Quick facts
- Is the Network Security Engineer role remote?
- No — this is an on-site role in Hybrid.
- What's the salary range?
- Cloudflare lists €38,000–€52,000 for this role.
- Where is the role based?
- Cloudflare is hiring for this position in Hybrid.
- What's the tech stack?
- Joblaze extracted these technologies from the posting: Apache, BGP, Caddy, DNS, GRE, Git.
- What seniority level is this role?
- Cloudflare targets mid-level candidates for this position.
- Is this full-time or contract?
- Full-time for this Network Security Engineer role at Cloudflare.
From the original posting
About Us
Available Locations: Lisbon, Portugal
About the role
Do you love solving complex technical issues and interacting with people? Are you passionate about providing premium-level support to customers and are a standout colleague? Cloudflare is 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. This will span the range of Cloudflare products from Magic Transit Infrastructure Protection, Argo Smart Routing, DDoS mitigation and Network Firewall, to using the Web Application firewall (WAF), Spectrum and Rate Limiting to help customers.
Responsibilities
- Communicate with customers via chat, email, and phone
- Compare traffic signatures and attributes including IP addresses, cookie variations, HTTP headers, and JavaScript footprints to determine what is good traffic and what is malicious
- DDoS mitigation for OSI layers 3,4, & 7: 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 Operations teams to mitigate attacks, suggest steps to mitigate, and apply the appropriate mitigation, when applicable
- Work with Engineering and Product teams to improve the products and tools
Desirable Skills, Knowledge, and Experience:
- Self-driven and capable of learning new technologies / systems / features with little guidance
- Fundamental understanding how the Internet works (OSI Model)
- Advanced understanding of modern internet protocols like TCP and UDP
- Computer Networking fundamentals, experience with iptables and looking glass
- Experience troubleshooting network connectivity issues, BGP routing, and GRE tunnels
- Packet capture analysis
- Experience in command line and tools, including curl, dig, traceroute, openssl, git
- Experience troubleshooting DNS, SSL / TLS, HTTP
- Experience in a web development and / or hosting environment such as installing and configuring web servers like Apache, Nginx, Caddy and IIS
- Experience writing scripts in Bash, Python, JavaScript or other scripting language
- Experience in working as part of a team in a customer-facing role
Bonus Points
- You are fluent in German, Japanese, French, Spanish, Portuguese, or Mandarin
- You have worked with PostgreSQL, MySQL, MS SQL, and other database servers
- You are familiar with Cloudflare and are actively using our platform
Compensation
Compensation may be adjusted depending on work location.
- For Lisbon based hires: Estimated annual salary of €38,000-52,000.
Equity
This role is eligible to participate in Cloudflare’s equity plan.
What Makes Cloudflare Special?
Standard company text repeated across Cloudflare's postings is omitted here.
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