Threat Detection and Incident Response Intern (Summer 2026)

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 Cloudflare's Security Team Security is at the heart of Cloudflare’s mission to help build a better Internet. Anytime we push code, it automatically affects the millions of Internet properties (powering websites, remote teams, APIs, mobile apps, etc.) running on our global network. Cloudflare's network is one of the largest in the world, spanning over 330 cities in more than 125 countries, and operating within 50 milliseconds of 95% of the Internet-connected population. The Threat Detection and Security Incident Response teams are responsible for identifying, understanding, detecting, and responding to threats targeting Cloudflare. About the Internship Program The ideal Security intern is passionate about making the Internet a more secure place. You will work alongside experienced security team members to partner with them in planning, executing and overseeing initiatives that help improve Cloudflare’s security posture. We are looking for interns who are curious, proactive, and able to approach problems with a "security-first" mindset. This is a unique opportunity for candidates who want to learn how to defend systems at a scale that few other companies can offer. What would you do as a Cloudflare intern? Execute a specialized security project over 12-16 weeks that directly improves Cloudflare’s defensive posture. With a focus on threats and how they operate, work to build and improve systems that are the front lines of protecting Cloudflare from malicious attacks. Work with Incident Response Engineers to triage and respond to security alerts and incidents. Use the latest technologies and techniques to engineer solutions to enhance incident response and security operations. Including automation, agentic AI and others Work cross-functionally with Legal, People, Engineering, and Finance teams to integrate security into the fabric of the company. Work closely with a mentor who will provide hands-on guidance in your specific security domain. Present your security project to the entire company at the end of the internship. Connect and learn from our executives and leadership team including our co-founders. Write for our Cloudflare blog and be featured on Cloudflare.tv sessions. You can check out our internship blogs to learn more about our program and hear directly from our past interns. Desirable skills, knowledge and experience Understanding of attacke ... (truncated, view full listing at source)