Security Engineer Intern (Summer 2026)

Summary: Cloudflare is on a mission to help build a better Internet, running one of the world’s largest networks that powers millions of websites. The Security Engineer Intern will work alongside experienced engineers to identify vulnerabilities, harden infrastructure, and build tools to protect users, while gaining valuable experience in security engineering. Responsibilities: - Ship and deliver security-focused projects over 12-16 weeks with autonomy and support - Work cross-functionally with Product, Infrastructure, and Engineering teams to integrate security into every stage of the development lifecycle - Work closely with a mentor to guide you through the internship, develop your security expertise, and help with career goals - Build your network across the company through our various in and out of office socials, networking programs, Employee Resource Group (ERG) programs, and Activity Groups - 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 (e.g., documenting a new security tool or a vulnerability research finding) and be featured on Cloudflare.tv sessions Required Qualifications: - Currently pursuing a degree in Computer Science, Cybersecurity, Computer Engineering, or a related technical field - A solid understanding of the OWASP Top 10, common attack vectors (XSS, SQLi, CSRF), and how to mitigate them - Demonstrated critical thinking skills and drive to learn and adapt new technologies - Curiosity, empathy and ability to get things done - Ability to commit to a minimum 12 week summer internship - In office 3-5 days a week in the location of the internship - Local to Austin; relocation not provided Preferred Qualifications: - Demonstrated passion for security & software development, such as personal projects, open-source contributions, or experience with our developer platform using Cloudflare for Students Required Skills: Security Fundamentals, OWASP Top 10, Common attack vectors Important Skills: Computer Science degree Nice-to-Have Skills: Curiosity, Empathy, Critical thinking, Adaptability Internship Start Date: Start in 2026 Summer