.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. We realize people do not fit into neat boxes. We are looking for curious and empathetic individuals who are committed to developing themselves and learning new skills, and we are ready to help you do that. We cannot complete our mission without building a diverse and inclusive team. We hire the best people based on an evaluation of their potential and support them throughout their time at Cloudflare. Come join us! Available locations: Lisbon or London About Cloudflare and Our Team: Cloudflare's Engineering Team is home to some of the industry's top engineers, dedicated to building and scaling innovative software that handles a significant portion of Internet traffic. Our team, specifically responsible for Turnstile and Challenge Pages, collaborates closely with a dedicated Product Manager and other engineering teams to develop cutting-edge bot detection and mitigation solutions. Our focus is on enhancing internet security while preserving user privacy and usability. What You'll Do: As a Machine Learning Engineer on our team, you'll play a key role in expanding our Turnstile and Challenge products. Your responsibilities will include: Advanced Bot Detection: Develop sophisticated bot and human detection capabilities using machine learning and traffic analysis techniques, with a strong emphasis on privacy and security. Full-Stack Development: Engage in full-stack development—from backend systems and distributed frameworks to client-side logic—to build comprehensive solutions. Scalable and Secure Software: Build scalable, secure, and privacy-conscious software to accommodate a growing and diverse user base. Cross-Functional Collaboration: Work closely with cross-functional teams to innovate and enhance our security solutions. Research and Development: Contribute to research efforts, potentially publishing findings in security and privacy conferences. About You: We're looking for a motivated individual with: Strong Background in Machine Learning and Security: Expertise in machine learning, distributed systems, and security, particularly in traffic analysis