Senior PKI & Cryptographic Systems Engineer

Cloudflare is hiring a Senior Software Engineer for PKI & Cryptographic Systems in a hybrid model across Austin, London, or Lisbon. You will design and build the cryptographic infrastructure, manage certificate lifecycles, and ensure secure key handling at scale. You will work at the intersection of applied cryptography, distributed systems, and security engineering, shaping Cloudflare’s PKI stack for the post-quantum era and large-scale operations.