Cloudflare is hiring a Research Engineer Intern (Summer 2026)

Requirements

• Evidence of tackling hard or open-ended problems
• Proven track record of peer-reviewed research, open-source software contributions, or standards development, that is commensurate with level of training
• Ability to clearly communicate research ideas through papers, pre-prints, standards documents, blogs, or similar media
• Ability to work in a systems-level programming language (e.g. Rust, C, Go)
• Passion for debugging and ensuring system reliability
• Familiarity with continuous integration workflows and source control systems (e.g., Gitlab, Github)
• Willing and eager to share knowledge, with the skills to do so
• Knowledge or experience with at least one of the following: Computer networking protocols (TCP/IP, DNS, BGP, QUIC, etc.) and related algorithms
• Machine learning analysis, ideally in systems or network optimization
• Authentication protocols, applied cryptography, PKI and SSL/TLS
• Operating or distributed systems analysis or development
• Measurement for network and computer systems
• Proficiency in a scripting language, such as Python
• Ability to commit to a 12 week summer internship
• In office 3-4 days a week in Lisbon, Portugal

Nice to Have

• Proven track record of independently driving projects in a fast-paced environment
• Experience working in groups, or with multiple stakeholders
• Able to fluently work across multiple programming languages

Additional Information

• In office 3-4 days a week in Lisbon, Portugal
• Ability to commit to a 12 week summer internship